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Diffstat (limited to 'docs/quickstart.html')
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{ color: #19177C } /* Name.Variable.Global */ +.listingblock .pygments .tok-vi { color: #19177C } /* Name.Variable.Instance */ +.listingblock .pygments .tok-il { color: #666666 } /* Literal.Number.Integer.Long */ +</style> </head> -<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> -<div class="article"> -<div class="section"> -<div class="titlepage"><div><div><h2 class="title" style="clear: both"> -<a name="quickstart.main"></a><a class="link" href="quickstart.html#quickstart.main" title="pugixml 1.5 quick start guide"> pugixml 1.5 quick start guide</a> -</h2></div></div></div> -<div class="toc"><dl class="toc"> -<dt><span class="section"><a href="quickstart.html#quickstart.main.introduction"> Introduction</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.install"> Installation</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.dom"> Document object model</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.loading"> Loading document</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.access"> Accessing document data</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.modify"> Modifying document data</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.saving"> Saving document</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.feedback"> Feedback</a></span></dt> -<dt><span class="section"><a href="quickstart.html#quickstart.main.license"> License</a></span></dt> -</dl></div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.introduction"></a><a class="link" href="quickstart.html#quickstart.main.introduction" title="Introduction"> Introduction</a> -</h3></div></div></div> -<p> - <a href="http://pugixml.org/" target="_top">pugixml</a> is a light-weight C++ XML - processing library. It consists of a DOM-like interface with rich traversal/modification - capabilities, an extremely fast XML parser which constructs the DOM tree - from an XML file/buffer, and an XPath 1.0 implementation for complex data-driven - tree queries. Full Unicode support is also available, with Unicode interface - variants and conversions between different Unicode encodings (which happen - automatically during parsing/saving). The library is extremely portable and - easy to integrate and use. pugixml is developed and maintained since 2006 - and has many users. All code is distributed under the <a class="link" href="quickstart.html#quickstart.main.license" title="License">MIT - license</a>, making it completely free to use in both open-source and - proprietary applications. - </p> -<p> - pugixml enables very fast, convenient and memory-efficient XML document processing. - However, since pugixml has a DOM parser, it can't process XML documents that - do not fit in memory; also the parser is a non-validating one, so if you - need DTD/Schema validation, the library is not for you. - </p> -<p> - This is the quick start guide for pugixml, which purpose is to enable you - to start using the library quickly. Many important library features are either - not described at all or only mentioned briefly; for more complete information - you <a href="manual.html" target="_top">should read the complete manual</a>. - </p> -<div class="note"><table border="0" summary="Note"> +<body class="article toc2 toc-right"> +<div id="header"> +<h1>pugixml 1.6 quick start guide</h1> +<div class="details"> +<span id="author" class="author">website</span><br> +<span id="email" class="email"><a href="http://pugixml.org" class="bare">http://pugixml.org</a></span><br> +<span id="author2" class="author">repository</span><br> +<span id="email2" class="email"><a href="http://github.com/zeux/pugixml" class="bare">http://github.com/zeux/pugixml</a></span><br> +</div> +<div id="toc" class="toc2"> +<div id="toctitle">Table of Contents</div> +<ul class="sectlevel1"> +<li><a href="#introduction">Introduction</a></li> +<li><a href="#install">Installation</a></li> +<li><a href="#dom">Document object model</a></li> +<li><a href="#loading">Loading document</a></li> +<li><a href="#access">Accessing document data</a></li> +<li><a href="#modify">Modifying document data</a></li> +<li><a href="#saving">Saving document</a></li> +<li><a href="#feedback">Feedback</a></li> +<li><a href="#license">License</a></li> +</ul> +</div> +</div> +<div id="content"> +<div class="sect1"> +<h2 id="introduction"><a class="anchor" href="#introduction"></a>Introduction</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p><a href="http://pugixml.org/">pugixml</a> is a light-weight C++ XML processing library. It consists of a DOM-like interface with rich traversal/modification capabilities, an extremely fast XML parser which constructs the DOM tree from an XML file/buffer, and an XPath 1.0 implementation for complex data-driven tree queries. Full Unicode support is also available, with two Unicode interface variants and conversions between different Unicode encodings (which happen automatically during parsing/saving). The library is extremely portable and easy to integrate and use. pugixml is developed and maintained since 2006 and has many users. All code is distributed under the <a href="#license">MIT license</a>, making it completely free to use in both open-source and proprietary applications.</p> +</div> +<div class="paragraph"> +<p>pugixml enables very fast, convenient and memory-efficient XML document processing. However, since pugixml has a DOM parser, it can’t process XML documents that do not fit in memory; also the parser is a non-validating one, so if you need DTD/Schema validation, the library is not for you.</p> +</div> +<div class="paragraph"> +<p>This is the quick start guide for pugixml, which purpose is to enable you to start using the library quickly. Many important library features are either not described at all or only mentioned briefly; for more complete information you <a href="manual.html">should read the complete manual</a>.</p> +</div> +<div class="admonitionblock note"> +<table> <tr> -<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td> -<th align="left">Note</th> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +No documentation is perfect; neither is this one. If you find errors or omissions, please don’t hesitate to <a href="https://github.com/zeux/pugixml/issues/new">submit an issue or open a pull request</a> with a fix. +</td> </tr> -<tr><td align="left" valign="top"><p> - No documentation is perfect, neither is this one. If you encounter a description - that is unclear, please file an issue as described in <a class="xref" href="quickstart.html#quickstart.main.feedback" title="Feedback"> Feedback</a>. Also if - you can spare the time for a full proof-reading, including spelling and - grammar, that would be great! Please <a class="link" href="quickstart.html#email">send me an e-mail</a>; - as a token of appreciation, your name will be included into the corresponding - section of the manual. - </p></td></tr> -</table></div> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.install"></a><a class="link" href="quickstart.html#quickstart.main.install" title="Installation"> Installation</a> -</h3></div></div></div> -<p> - pugixml is distributed in source form. You can download a source distribution - via one of the following links: - </p> -<pre class="programlisting"><a href="https://github.com/zeux/pugixml/releases/download/v1.5/pugixml-1.5.zip" target="_top">https://github.com/zeux/pugixml/releases/download/v1.5/pugixml-1.5.zip</a> -<a href="https://github.com/zeux/pugixml/releases/download/v1.5/pugixml-1.5.tar.gz" target="_top">https://github.com/zeux/pugixml/releases/download/v1.5/pugixml-1.5.tar.gz</a> -</pre> -<p> - The distribution contains library source, documentation (the guide you're - reading now and the manual) and some code examples. After downloading the - distribution, install pugixml by extracting all files from the compressed - archive. The files have different line endings depending on the archive format - - <code class="filename">.zip</code> archive has Windows line endings, <code class="filename">.tar.gz</code> archive has Unix line endings. - Otherwise the files in both archives are identical. - </p> -<p> - The complete pugixml source consists of three files - one source file, <code class="filename">pugixml.cpp</code>, - and two header files, <code class="filename">pugixml.hpp</code> and <code class="filename">pugiconfig.hpp</code>. <code class="filename">pugixml.hpp</code> is the primary - header which you need to include in order to use pugixml classes/functions. - The rest of this guide assumes that <code class="filename">pugixml.hpp</code> is either in the current directory - or in one of include directories of your projects, so that <code class="computeroutput"><span class="preprocessor">#include</span> <span class="string">"pugixml.hpp"</span></code> - can find the header; however you can also use relative path (i.e. <code class="computeroutput"><span class="preprocessor">#include</span> <span class="string">"../libs/pugixml/src/pugixml.hpp"</span></code>) - or include directory-relative path (i.e. <code class="computeroutput"><span class="preprocessor">#include</span> - <span class="special"><</span><span class="identifier">xml</span><span class="special">/</span><span class="identifier">thirdparty</span><span class="special">/</span><span class="identifier">pugixml</span><span class="special">/</span><span class="identifier">src</span><span class="special">/</span><span class="identifier">pugixml</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>). - </p> -<p> - The easiest way to build pugixml is to compile the source file, <code class="filename">pugixml.cpp</code>, - along with the existing library/executable. This process depends on the method - of building your application; for example, if you're using Microsoft Visual - Studio<a href="#ftn.trademarks" class="footnote" name="trademarks"><sup class="footnote">[1]</sup></a>, - Apple Xcode, Code::Blocks or any other IDE, just add <code class="filename">pugixml.cpp</code> to one of - your projects. There are other building methods available, including building - pugixml as a standalone static/shared library; <a href="manual/install.html#manual.install.building" target="_top">read - the manual</a> for further information. - </p> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.dom"></a><a class="link" href="quickstart.html#quickstart.main.dom" title="Document object model"> Document object model</a> -</h3></div></div></div> -<p> - pugixml stores XML data in DOM-like way: the entire XML document (both document - structure and element data) is stored in memory as a tree. The tree can be - loaded from character stream (file, string, C++ I/O stream), then traversed - via special API or XPath expressions. The whole tree is mutable: both node - structure and node/attribute data can be changed at any time. Finally, the - result of document transformations can be saved to a character stream (file, - C++ I/O stream or custom transport). - </p> -<p> - The root of the tree is the document itself, which corresponds to C++ type - <code class="computeroutput"><span class="identifier">xml_document</span></code>. Document has - one or more child nodes, which correspond to C++ type <code class="computeroutput"><span class="identifier">xml_node</span></code>. - Nodes have different types; depending on a type, a node can have a collection - of child nodes, a collection of attributes, which correspond to C++ type - <code class="computeroutput"><span class="identifier">xml_attribute</span></code>, and some additional - data (i.e. name). - </p> -<p> - The most common node types are: - </p> -<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> -<li class="listitem"> - Document node (<code class="computeroutput"><span class="identifier">node_document</span></code>) - - this is the root of the tree, which consists of several child nodes. - This node corresponds to <code class="computeroutput"><span class="identifier">xml_document</span></code> - class; note that <code class="computeroutput"><span class="identifier">xml_document</span></code> - is a sub-class of <code class="computeroutput"><span class="identifier">xml_node</span></code>, - so the entire node interface is also available. - </li> -<li class="listitem"> - Element/tag node (<code class="computeroutput"><span class="identifier">node_element</span></code>) - - this is the most common type of node, which represents XML elements. - Element nodes have a name, a collection of attributes and a collection - of child nodes (both of which may be empty). The attribute is a simple - name/value pair. - </li> -<li class="listitem"> - Plain character data nodes (<code class="computeroutput"><span class="identifier">node_pcdata</span></code>) - represent plain text in XML. PCDATA nodes have a value, but do not have - name or children/attributes. Note that <span class="bold"><strong>plain character - data is not a part of the element node but instead has its own node</strong></span>; - for example, an element node can have several child PCDATA nodes. - </li> -</ul></div> -<p> - Despite the fact that there are several node types, there are only three - C++ types representing the tree (<code class="computeroutput"><span class="identifier">xml_document</span></code>, - <code class="computeroutput"><span class="identifier">xml_node</span></code>, <code class="computeroutput"><span class="identifier">xml_attribute</span></code>); - some operations on <code class="computeroutput"><span class="identifier">xml_node</span></code> - are only valid for certain node types. They are described below. - </p> -<div class="note"><table border="0" summary="Note"> +</table> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="install"><a class="anchor" href="#install"></a>Installation</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>You can download the latest source distribution as an archive:</p> +</div> +<div class="paragraph"> +<p><a href="https://github.com/zeux/pugixml/releases/download/v1.6/pugixml-1.6.zip">pugixml-1.6.zip</a> (Windows line endings) +/ +<a href="https://github.com/zeux/pugixml/releases/download/v1.6/pugixml-1.6.tar.gz">pugixml-1.6.tar.gz</a> (Unix line endings)</p> +</div> +<div class="paragraph"> +<p>The distribution contains library source, documentation (the guide you’re reading now and the manual) and some code examples. After downloading the distribution, install pugixml by extracting all files from the compressed archive.</p> +</div> +<div class="paragraph"> +<p>The complete pugixml source consists of three files - one source file, <code>pugixml.cpp</code>, and two header files, <code>pugixml.hpp</code> and <code>pugiconfig.hpp</code>. <code>pugixml.hpp</code> is the primary header which you need to include in order to use pugixml classes/functions. The rest of this guide assumes that <code>pugixml.hpp</code> is either in the current directory or in one of include directories of your projects, so that <code>#include "pugixml.hpp"</code> can find the header; however you can also use relative path (i.e. <code>#include "../libs/pugixml/src/pugixml.hpp"</code>) or include directory-relative path (i.e. <code>#include <xml/thirdparty/pugixml/src/pugixml.hpp></code>).</p> +</div> +<div class="paragraph"> +<p>The easiest way to build pugixml is to compile the source file, <code>pugixml.cpp</code>, along with the existing library/executable. This process depends on the method of building your application; for example, if you’re using Microsoft Visual Studio <span class="footnote">[<a id="_footnoteref_1" class="footnote" href="#_footnote_1" title="View footnote.">1</a>]</span>, Apple Xcode, Code::Blocks or any other IDE, just add <code>pugixml.cpp</code> to one of your projects. There are other building methods available, including building pugixml as a standalone static/shared library; <a href="manual/install.html#install.building">read the manual</a> for further information.</p> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="dom"><a class="anchor" href="#dom"></a>Document object model</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>pugixml stores XML data in DOM-like way: the entire XML document (both document structure and element data) is stored in memory as a tree. The tree can be loaded from character stream (file, string, C++ I/O stream), then traversed via special API or XPath expressions. The whole tree is mutable: both node structure and node/attribute data can be changed at any time. Finally, the result of document transformations can be saved to a character stream (file, C++ I/O stream or custom transport).</p> +</div> +<div class="paragraph"> +<p>The root of the tree is the document itself, which corresponds to C++ type <code>xml_document</code>. Document has one or more child nodes, which correspond to C++ type <code>xml_node</code>. Nodes have different types; depending on a type, a node can have a collection of child nodes, a collection of attributes, which correspond to C++ type <code>xml_attribute</code>, and some additional data (i.e. name).</p> +</div> +<div class="paragraph"> +<p>The most common node types are:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>Document node (<code>node_document</code>) - this is the root of the tree, which consists of several child nodes. This node corresponds to <code>xml_document</code> class; note that <code>xml_document</code> is a sub-class of <code>xml_node</code>, so the entire node interface is also available.</p> +</li> +<li> +<p>Element/tag node (<code>node_element</code>) - this is the most common type of node, which represents XML elements. Element nodes have a name, a collection of attributes and a collection of child nodes (both of which may be empty). The attribute is a simple name/value pair.</p> +</li> +<li> +<p>Plain character data nodes (<code>node_pcdata</code>) represent plain text in XML. PCDATA nodes have a value, but do not have name or children/attributes. Note that <strong>plain character data is not a part of the element node but instead has its own node</strong>; for example, an element node can have several child PCDATA nodes.</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>Despite the fact that there are several node types, there are only three C++ types representing the tree (<code>xml_document</code>, <code>xml_node</code>, <code>xml_attribute</code>); some operations on <code>xml_node</code> are only valid for certain node types. They are described below.</p> +</div> +<div class="admonitionblock note"> +<table> <tr> -<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td> -<th align="left">Note</th> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content"> +All pugixml classes and functions are located in <code>pugi</code> namespace; you have to either use explicit name qualification (i.e. <code>pugi::xml_node</code>), or to gain access to relevant symbols via <code>using</code> directive (i.e. <code>using pugi::xml_node;</code> or <code>using namespace pugi;</code>). +</td> </tr> -<tr><td align="left" valign="top"><p> - All pugixml classes and functions are located in <code class="computeroutput"><span class="identifier">pugi</span></code> - namespace; you have to either use explicit name qualification (i.e. <code class="computeroutput"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span></code>), or to gain access to relevant - symbols via <code class="computeroutput"><span class="keyword">using</span></code> directive - (i.e. <code class="computeroutput"><span class="keyword">using</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span><span class="special">;</span></code> or <code class="computeroutput"><span class="keyword">using</span> - <span class="keyword">namespace</span> <span class="identifier">pugi</span><span class="special">;</span></code>). - </p></td></tr> -</table></div> -<p> - <code class="computeroutput"><span class="identifier">xml_document</span></code> is the owner - of the entire document structure; destroying the document destroys the whole - tree. The interface of <code class="computeroutput"><span class="identifier">xml_document</span></code> - consists of loading functions, saving functions and the entire interface - of <code class="computeroutput"><span class="identifier">xml_node</span></code>, which allows - for document inspection and/or modification. Note that while <code class="computeroutput"><span class="identifier">xml_document</span></code> is a sub-class of <code class="computeroutput"><span class="identifier">xml_node</span></code>, <code class="computeroutput"><span class="identifier">xml_node</span></code> - is not a polymorphic type; the inheritance is present only to simplify usage. - </p> -<p> - <code class="computeroutput"><span class="identifier">xml_node</span></code> is the handle to - document node; it can point to any node in the document, including document - itself. There is a common interface for nodes of all types. Note that <code class="computeroutput"><span class="identifier">xml_node</span></code> is only a handle to the actual - node, not the node itself - you can have several <code class="computeroutput"><span class="identifier">xml_node</span></code> - handles pointing to the same underlying object. Destroying <code class="computeroutput"><span class="identifier">xml_node</span></code> handle does not destroy the node - and does not remove it from the tree. - </p> -<p> - There is a special value of <code class="computeroutput"><span class="identifier">xml_node</span></code> - type, known as null node or empty node. It does not correspond to any node - in any document, and thus resembles null pointer. However, all operations - are defined on empty nodes; generally the operations don't do anything and - return empty nodes/attributes or empty strings as their result. This is useful - for chaining calls; i.e. you can get the grandparent of a node like so: - <code class="computeroutput"><span class="identifier">node</span><span class="special">.</span><span class="identifier">parent</span><span class="special">().</span><span class="identifier">parent</span><span class="special">()</span></code>; - if a node is a null node or it does not have a parent, the first <code class="computeroutput"><span class="identifier">parent</span><span class="special">()</span></code> - call returns null node; the second <code class="computeroutput"><span class="identifier">parent</span><span class="special">()</span></code> call then also returns null node, so you - don't have to check for errors twice. You can test if a handle is null via - implicit boolean cast: <code class="computeroutput"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">node</span><span class="special">)</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span></code> - or <code class="computeroutput"><span class="keyword">if</span> <span class="special">(!</span><span class="identifier">node</span><span class="special">)</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span></code>. - </p> -<p> - <code class="computeroutput"><span class="identifier">xml_attribute</span></code> is the handle - to an XML attribute; it has the same semantics as <code class="computeroutput"><span class="identifier">xml_node</span></code>, - i.e. there can be several <code class="computeroutput"><span class="identifier">xml_attribute</span></code> - handles pointing to the same underlying object and there is a special null - attribute value, which propagates to function results. - </p> -<p> - There are two choices of interface and internal representation when configuring - pugixml: you can either choose the UTF-8 (also called char) interface or - UTF-16/32 (also called wchar_t) one. The choice is controlled via <code class="computeroutput"><span class="identifier">PUGIXML_WCHAR_MODE</span></code> define; you can set - it via <code class="filename">pugiconfig.hpp</code> or via preprocessor options. All tree functions that - work with strings work with either C-style null terminated strings or STL - strings of the selected character type. <a href="manual/dom.html#manual.dom.unicode" target="_top">Read - the manual</a> for additional information on Unicode interface. - </p> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.loading"></a><a class="link" href="quickstart.html#quickstart.main.loading" title="Loading document"> Loading document</a> -</h3></div></div></div> -<p> - pugixml provides several functions for loading XML data from various places - - files, C++ iostreams, memory buffers. All functions use an extremely fast - non-validating parser. This parser is not fully W3C conformant - it can load - any valid XML document, but does not perform some well-formedness checks. - While considerable effort is made to reject invalid XML documents, some validation - is not performed because of performance reasons. XML data is always converted - to internal character format before parsing. pugixml supports all popular - Unicode encodings (UTF-8, UTF-16 (big and little endian), UTF-32 (big and - little endian); UCS-2 is naturally supported since it's a strict subset of - UTF-16) and handles all encoding conversions automatically. - </p> -<p> - The most common source of XML data is files; pugixml provides a separate - function for loading XML document from file. This function accepts file path - as its first argument, and also two optional arguments, which specify parsing - options and input data encoding, which are described in the manual. - </p> -<p> - This is an example of loading XML document from file (<a href="samples/load_file.cpp" target="_top">samples/load_file.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span> - -<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_file</span><span class="special">(</span><span class="string">"tree.xml"</span><span class="special">);</span> - -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Load result: "</span> <span class="special"><<</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">description</span><span class="special">()</span> <span class="special"><<</span> <span class="string">", mesh name: "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"mesh"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> -</pre> -<p> - </p> -<p> - <code class="computeroutput"><span class="identifier">load_file</span></code>, as well as other - loading functions, destroys the existing document tree and then tries to - load the new tree from the specified file. The result of the operation is - returned in an <code class="computeroutput"><span class="identifier">xml_parse_result</span></code> - object; this object contains the operation status, and the related information - (i.e. last successfully parsed position in the input file, if parsing fails). - </p> -<p> - Parsing result object can be implicitly converted to <code class="computeroutput"><span class="keyword">bool</span></code>; - if you do not want to handle parsing errors thoroughly, you can just check - the return value of load functions as if it was a <code class="computeroutput"><span class="keyword">bool</span></code>: - <code class="computeroutput"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_file</span><span class="special">(</span><span class="string">"file.xml"</span><span class="special">))</span> <span class="special">{</span> <span class="special">...</span> - <span class="special">}</span> <span class="keyword">else</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span></code>. - Otherwise you can use the <code class="computeroutput"><span class="identifier">status</span></code> - member to get parsing status, or the <code class="computeroutput"><span class="identifier">description</span><span class="special">()</span></code> member function to get the status in a - string form. - </p> -<p> - This is an example of handling loading errors (<a href="samples/load_error_handling.cpp" target="_top">samples/load_error_handling.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span> -<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="identifier">source</span><span class="special">);</span> - -<span class="keyword">if</span> <span class="special">(</span><span class="identifier">result</span><span class="special">)</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"XML ["</span> <span class="special"><<</span> <span class="identifier">source</span> <span class="special"><<</span> <span class="string">"] parsed without errors, attr value: ["</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"attr"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"]\n\n"</span><span class="special">;</span> -<span class="keyword">else</span> -<span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"XML ["</span> <span class="special"><<</span> <span class="identifier">source</span> <span class="special"><<</span> <span class="string">"] parsed with errors, attr value: ["</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"attr"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"]\n"</span><span class="special">;</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Error description: "</span> <span class="special"><<</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">description</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Error offset: "</span> <span class="special"><<</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">offset</span> <span class="special"><<</span> <span class="string">" (error at [..."</span> <span class="special"><<</span> <span class="special">(</span><span class="identifier">source</span> <span class="special">+</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">offset</span><span class="special">)</span> <span class="special"><<</span> <span class="string">"]\n\n"</span><span class="special">;</span> -<span class="special">}</span> -</pre> -<p> - </p> -<p> - Sometimes XML data should be loaded from some other source than file, i.e. - HTTP URL; also you may want to load XML data from file using non-standard - functions, i.e. to use your virtual file system facilities or to load XML - from gzip-compressed files. These scenarios either require loading document - from memory, in which case you should prepare a contiguous memory block with - all XML data and to pass it to one of buffer loading functions, or loading - document from C++ IOstream, in which case you should provide an object which - implements <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span></code> or <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wistream</span></code> - interface. - </p> -<p> - There are different functions for loading document from memory; they treat - the passed buffer as either an immutable one (<code class="computeroutput"><span class="identifier">load_buffer</span></code>), - a mutable buffer which is owned by the caller (<code class="computeroutput"><span class="identifier">load_buffer_inplace</span></code>), - or a mutable buffer which ownership belongs to pugixml (<code class="computeroutput"><span class="identifier">load_buffer_inplace_own</span></code>). - There is also a simple helper function, <code class="computeroutput"><span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load</span></code>, - for cases when you want to load the XML document from null-terminated character - string. - </p> -<p> - This is an example of loading XML document from memory using one of these - functions (<a href="samples/load_memory.cpp" target="_top">samples/load_memory.cpp</a>); - read the sample code for more examples: - </p> -<p> - -</p> -<pre class="programlisting"><span class="keyword">const</span> <span class="keyword">char</span> <span class="identifier">source</span><span class="special">[]</span> <span class="special">=</span> <span class="string">"<mesh name='sphere'><bounds>0 0 1 1</bounds></mesh>"</span><span class="special">;</span> -<span class="identifier">size_t</span> <span class="identifier">size</span> <span class="special">=</span> <span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">source</span><span class="special">);</span> -</pre> -<p> - </p> -<p> - -</p> -<pre class="programlisting"><span class="comment">// You can use load_buffer_inplace to load document from mutable memory block; the block's lifetime must exceed that of document -</span><span class="keyword">char</span><span class="special">*</span> <span class="identifier">buffer</span> <span class="special">=</span> <span class="keyword">new</span> <span class="keyword">char</span><span class="special">[</span><span class="identifier">size</span><span class="special">];</span> -<span class="identifier">memcpy</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">source</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span> - -<span class="comment">// The block can be allocated by any method; the block is modified during parsing -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_buffer_inplace</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span> - -<span class="comment">// You have to destroy the block yourself after the document is no longer used -</span><span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">buffer</span><span class="special">;</span> -</pre> -<p> - </p> -<p> - This is a simple example of loading XML document from file using streams - (<a href="samples/load_stream.cpp" target="_top">samples/load_stream.cpp</a>); read - the sample code for more complex examples involving wide streams and locales: - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">stream</span><span class="special">(</span><span class="string">"weekly-utf-8.xml"</span><span class="special">);</span> -<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load</span><span class="special">(</span><span class="identifier">stream</span><span class="special">);</span> -</pre> -<p> - </p> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.access"></a><a class="link" href="quickstart.html#quickstart.main.access" title="Accessing document data"> Accessing document data</a> -</h3></div></div></div> -<p> - pugixml features an extensive interface for getting various types of data - from the document and for traversing the document. You can use various accessors - to get node/attribute data, you can traverse the child node/attribute lists - via accessors or iterators, you can do depth-first traversals with <code class="computeroutput"><span class="identifier">xml_tree_walker</span></code> objects, and you can use - XPath for complex data-driven queries. - </p> -<p> - You can get node or attribute name via <code class="computeroutput"><span class="identifier">name</span><span class="special">()</span></code> accessor, and value via <code class="computeroutput"><span class="identifier">value</span><span class="special">()</span></code> accessor. Note that both functions never - return null pointers - they either return a string with the relevant content, - or an empty string if name/value is absent or if the handle is null. Also - there are two notable things for reading values: - </p> -<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> -<li class="listitem"> - It is common to store data as text contents of some node - i.e. <code class="computeroutput"><span class="special"><</span><span class="identifier">node</span><span class="special">><</span><span class="identifier">description</span><span class="special">></span><span class="identifier">This</span> - <span class="identifier">is</span> <span class="identifier">a</span> - <span class="identifier">node</span><span class="special"></</span><span class="identifier">description</span><span class="special">></</span><span class="identifier">node</span><span class="special">></span></code>. - In this case, <code class="computeroutput"><span class="special"><</span><span class="identifier">description</span><span class="special">></span></code> node does not have a value, but instead - has a child of type <code class="computeroutput"><span class="identifier">node_pcdata</span></code> - with value <code class="computeroutput"><span class="string">"This is a node"</span></code>. - pugixml provides <code class="computeroutput"><span class="identifier">child_value</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">text</span><span class="special">()</span></code> helper functions to parse such data. - </li> -<li class="listitem"> - In many cases attribute values have types that are not strings - i.e. - an attribute may always contain values that should be treated as integers, - despite the fact that they are represented as strings in XML. pugixml - provides several accessors that convert attribute value to some other - type. - </li> -</ul></div> -<p> - This is an example of using these functions (<a href="samples/traverse_base.cpp" target="_top">samples/traverse_base.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">tool</span> <span class="special">=</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">);</span> <span class="identifier">tool</span><span class="special">;</span> <span class="identifier">tool</span> <span class="special">=</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">next_sibling</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">))</span> -<span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Tool "</span> <span class="special"><<</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"Filename"</span><span class="special">).</span><span class="identifier">value</span><span class="special">();</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">": AllowRemote "</span> <span class="special"><<</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"AllowRemote"</span><span class="special">).</span><span class="identifier">as_bool</span><span class="special">();</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", Timeout "</span> <span class="special"><<</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"Timeout"</span><span class="special">).</span><span class="identifier">as_int</span><span class="special">();</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", Description '"</span> <span class="special"><<</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">child_value</span><span class="special">(</span><span class="string">"Description"</span><span class="special">)</span> <span class="special"><<</span> <span class="string">"'\n"</span><span class="special">;</span> -<span class="special">}</span> -</pre> -<p> - </p> -<p> - Since a lot of document traversal consists of finding the node/attribute - with the correct name, there are special functions for that purpose. For - example, <code class="computeroutput"><span class="identifier">child</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">)</span></code> - returns the first node which has the name <code class="computeroutput"><span class="string">"Tool"</span></code>, - or null handle if there is no such node. This is an example of using such - functions (<a href="samples/traverse_base.cpp" target="_top">samples/traverse_base.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Tool for *.dae generation: "</span> <span class="special"><<</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">find_child_by_attribute</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">,</span> <span class="string">"OutputFileMasks"</span><span class="special">,</span> <span class="string">"*.dae"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"Filename"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> - -<span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">tool</span> <span class="special">=</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">);</span> <span class="identifier">tool</span><span class="special">;</span> <span class="identifier">tool</span> <span class="special">=</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">next_sibling</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">))</span> -<span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Tool "</span> <span class="special"><<</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"Filename"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> -<span class="special">}</span> -</pre> -<p> - </p> -<p> - Child node lists and attribute lists are simply double-linked lists; while - you can use <code class="computeroutput"><span class="identifier">previous_sibling</span></code>/<code class="computeroutput"><span class="identifier">next_sibling</span></code> and other such functions for - iteration, pugixml additionally provides node and attribute iterators, so - that you can treat nodes as containers of other nodes or attributes. All - iterators are bidirectional and support all usual iterator operations. The - iterators are invalidated if the node/attribute objects they're pointing - to are removed from the tree; adding nodes/attributes does not invalidate - any iterators. - </p> -<p> - Here is an example of using iterators for document traversal (<a href="samples/traverse_iter.cpp" target="_top">samples/traverse_iter.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node_iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="special">++</span><span class="identifier">it</span><span class="special">)</span> -<span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Tool:"</span><span class="special">;</span> - - <span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_attribute_iterator</span> <span class="identifier">ait</span> <span class="special">=</span> <span class="identifier">it</span><span class="special">-></span><span class="identifier">attributes_begin</span><span class="special">();</span> <span class="identifier">ait</span> <span class="special">!=</span> <span class="identifier">it</span><span class="special">-></span><span class="identifier">attributes_end</span><span class="special">();</span> <span class="special">++</span><span class="identifier">ait</span><span class="special">)</span> - <span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">ait</span><span class="special">-></span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"="</span> <span class="special"><<</span> <span class="identifier">ait</span><span class="special">-></span><span class="identifier">value</span><span class="special">();</span> - <span class="special">}</span> - - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> -<span class="special">}</span> -</pre> -<p> - </p> -<p> - If your C++ compiler supports range-based for-loop (this is a C++11 feature, - at the time of writing it's supported by Microsoft Visual Studio 11 Beta, - GCC 4.6 and Clang 3.0), you can use it to enumerate nodes/attributes. Additional - helpers are provided to support this; note that they are also compatible - with <a href="http://www.boost.org/libs/foreach/" target="_top">Boost Foreach</a>, - and possibly other pre-C++11 foreach facilities. - </p> -<p> - Here is an example of using C++11 range-based for loop for document traversal - (<a href="samples/traverse_rangefor.cpp" target="_top">samples/traverse_rangefor.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">tool</span><span class="special">:</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">children</span><span class="special">(</span><span class="string">"Tool"</span><span class="special">))</span> -<span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Tool:"</span><span class="special">;</span> - - <span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_attribute</span> <span class="identifier">attr</span><span class="special">:</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">attributes</span><span class="special">())</span> - <span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"="</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">();</span> - <span class="special">}</span> - - <span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">child</span><span class="special">:</span> <span class="identifier">tool</span><span class="special">.</span><span class="identifier">children</span><span class="special">())</span> - <span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", child "</span> <span class="special"><<</span> <span class="identifier">child</span><span class="special">.</span><span class="identifier">name</span><span class="special">();</span> - <span class="special">}</span> - - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> -<span class="special">}</span> -</pre> -<p> - </p> -<p> - The methods described above allow traversal of immediate children of some - node; if you want to do a deep tree traversal, you'll have to do it via a - recursive function or some equivalent method. However, pugixml provides a - helper for depth-first traversal of a subtree. In order to use it, you have - to implement <code class="computeroutput"><span class="identifier">xml_tree_walker</span></code> - interface and to call <code class="computeroutput"><span class="identifier">traverse</span></code> - function. - </p> -<p> - This is an example of traversing tree hierarchy with xml_tree_walker (<a href="samples/traverse_walker.cpp" target="_top">samples/traverse_walker.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">simple_walker</span><span class="special">:</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_tree_walker</span> -<span class="special">{</span> - <span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">for_each</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">)</span> - <span class="special">{</span> - <span class="keyword">for</span> <span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">depth</span><span class="special">();</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">" "</span><span class="special">;</span> <span class="comment">// indentation -</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">node_types</span><span class="special">[</span><span class="identifier">node</span><span class="special">.</span><span class="identifier">type</span><span class="special">()]</span> <span class="special"><<</span> <span class="string">": name='"</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"', value='"</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"'\n"</span><span class="special">;</span> - - <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> <span class="comment">// continue traversal -</span> <span class="special">}</span> -<span class="special">};</span> -</pre> -<p> - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">simple_walker</span> <span class="identifier">walker</span><span class="special">;</span> -<span class="identifier">doc</span><span class="special">.</span><span class="identifier">traverse</span><span class="special">(</span><span class="identifier">walker</span><span class="special">);</span> -</pre> -<p> - </p> -<p> - Finally, for complex queries often a higher-level DSL is needed. pugixml - provides an implementation of XPath 1.0 language for such queries. The complete - description of XPath usage can be found in the manual, but here are some - examples: - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xpath_node_set</span> <span class="identifier">tools</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">select_nodes</span><span class="special">(</span><span class="string">"/Profile/Tools/Tool[@AllowRemote='true' and @DeriveCaptionFrom='lastparam']"</span><span class="special">);</span> - -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Tools:\n"</span><span class="special">;</span> - -<span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xpath_node_set</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">tools</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="special">++</span><span class="identifier">it</span><span class="special">)</span> -<span class="special">{</span> - <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xpath_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">it</span><span class="special">;</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">node</span><span class="special">().</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"Filename"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> -<span class="special">}</span> - -<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xpath_node</span> <span class="identifier">build_tool</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">select_node</span><span class="special">(</span><span class="string">"//Tool[contains(Description, 'build system')]"</span><span class="special">);</span> - -<span class="keyword">if</span> <span class="special">(</span><span class="identifier">build_tool</span><span class="special">)</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Build tool: "</span> <span class="special"><<</span> <span class="identifier">build_tool</span><span class="special">.</span><span class="identifier">node</span><span class="special">().</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"Filename"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> -</pre> -<p> - </p> -<div class="caution"><table border="0" summary="Caution"> +</table> +</div> +<div class="paragraph"> +<p><code>xml_document</code> is the owner of the entire document structure; destroying the document destroys the whole tree. The interface of <code>xml_document</code> consists of loading functions, saving functions and the entire interface of <code>xml_node</code>, which allows for document inspection and/or modification. Note that while <code>xml_document</code> is a sub-class of <code>xml_node</code>, <code>xml_node</code> is not a polymorphic type; the inheritance is present only to simplify usage.</p> +</div> +<div class="paragraph"> +<p><code>xml_node</code> is the handle to document node; it can point to any node in the document, including document itself. There is a common interface for nodes of all types. Note that <code>xml_node</code> is only a handle to the actual node, not the node itself - you can have several <code>xml_node</code> handles pointing to the same underlying object. Destroying <code>xml_node</code> handle does not destroy the node and does not remove it from the tree.</p> +</div> +<div class="paragraph"> +<p>There is a special value of <code>xml_node</code> type, known as null node or empty node. It does not correspond to any node in any document, and thus resembles null pointer. However, all operations are defined on empty nodes; generally the operations don’t do anything and return empty nodes/attributes or empty strings as their result. This is useful for chaining calls; i.e. you can get the grandparent of a node like so: <code>node.parent().parent()</code>; if a node is a null node or it does not have a parent, the first <code>parent()</code> call returns null node; the second <code>parent()</code> call then also returns null node, so you don’t have to check for errors twice. You can test if a handle is null via implicit boolean cast: <code>if (node) { …​ }</code> or <code>if (!node) { …​ }</code>.</p> +</div> +<div class="paragraph"> +<p><code>xml_attribute</code> is the handle to an XML attribute; it has the same semantics as <code>xml_node</code>, i.e. there can be several <code>xml_attribute</code> handles pointing to the same underlying object and there is a special null attribute value, which propagates to function results.</p> +</div> +<div class="paragraph"> +<p>There are two choices of interface and internal representation when configuring pugixml: you can either choose the UTF-8 (also called char) interface or UTF-16/32 (also called wchar_t) one. The choice is controlled via <code>PUGIXML_WCHAR_MODE</code> define; you can set it via <code>pugiconfig.hpp</code> or via preprocessor options. All tree functions that work with strings work with either C-style null terminated strings or STL strings of the selected character type. <a href="manual/dom.html#dom.unicode">Read the manual</a> for additional information on Unicode interface.</p> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="loading"><a class="anchor" href="#loading"></a>Loading document</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>pugixml provides several functions for loading XML data from various places - files, C++ iostreams, memory buffers. All functions use an extremely fast non-validating parser. This parser is not fully W3C conformant - it can load any valid XML document, but does not perform some well-formedness checks. While considerable effort is made to reject invalid XML documents, some validation is not performed because of performance reasons. XML data is always converted to internal character format before parsing. pugixml supports all popular Unicode encodings (UTF-8, UTF-16 (big and little endian), UTF-32 (big and little endian); UCS-2 is naturally supported since it’s a strict subset of UTF-16) and handles all encoding conversions automatically.</p> +</div> +<div class="paragraph"> +<p>The most common source of XML data is files; pugixml provides a separate function for loading XML document from file. This function accepts file path as its first argument, and also two optional arguments, which specify parsing options and input data encoding, which are described in the manual.</p> +</div> +<div class="paragraph"> +<p>This is an example of loading XML document from file (<a href="samples/load_file.cpp" class="bare">samples/load_file.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_document</span> <span class="tok-n">doc</span><span class="tok-p">;</span> + +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_parse_result</span> <span class="tok-n">result</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">load_file</span><span class="tok-p">(</span><span class="tok-s">"tree.xml"</span><span class="tok-p">);</span> + +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Load result: "</span> <span class="tok-o"><<</span> <span class="tok-n">result</span><span class="tok-p">.</span><span class="tok-n">description</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">", mesh name: "</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"mesh"</span><span class="tok-p">).</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"name"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p><code>load_file</code>, as well as other loading functions, destroys the existing document tree and then tries to load the new tree from the specified file. The result of the operation is returned in an <code>xml_parse_result</code> object; this object contains the operation status, and the related information (i.e. last successfully parsed position in the input file, if parsing fails).</p> +</div> +<div class="paragraph"> +<p>Parsing result object can be implicitly converted to <code>bool</code>; if you do not want to handle parsing errors thoroughly, you can just check the return value of load functions as if it was a <code>bool</code>: <code>if (doc.load_file("file.xml")) { …​ } else { …​ }</code>. Otherwise you can use the <code>status</code> member to get parsing status, or the <code>description()</code> member function to get the status in a string form.</p> +</div> +<div class="paragraph"> +<p>This is an example of handling loading errors (<a href="samples/load_error_handling.cpp" class="bare">samples/load_error_handling.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_document</span> <span class="tok-n">doc</span><span class="tok-p">;</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_parse_result</span> <span class="tok-n">result</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">load_string</span><span class="tok-p">(</span><span class="tok-n">source</span><span class="tok-p">);</span> + +<span class="tok-k">if</span> <span class="tok-p">(</span><span class="tok-n">result</span><span class="tok-p">)</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"XML ["</span> <span class="tok-o"><<</span> <span class="tok-n">source</span> <span class="tok-o"><<</span> <span class="tok-s">"] parsed without errors, attr value: ["</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"node"</span><span class="tok-p">).</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"attr"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"]</span><span class="tok-se">\n\n</span><span class="tok-s">"</span><span class="tok-p">;</span> +<span class="tok-p">}</span> +<span class="tok-k">else</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"XML ["</span> <span class="tok-o"><<</span> <span class="tok-n">source</span> <span class="tok-o"><<</span> <span class="tok-s">"] parsed with errors, attr value: ["</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"node"</span><span class="tok-p">).</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"attr"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"]</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Error description: "</span> <span class="tok-o"><<</span> <span class="tok-n">result</span><span class="tok-p">.</span><span class="tok-n">description</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Error offset: "</span> <span class="tok-o"><<</span> <span class="tok-n">result</span><span class="tok-p">.</span><span class="tok-n">offset</span> <span class="tok-o"><<</span> <span class="tok-s">" (error at [..."</span> <span class="tok-o"><<</span> <span class="tok-p">(</span><span class="tok-n">source</span> <span class="tok-o">+</span> <span class="tok-n">result</span><span class="tok-p">.</span><span class="tok-n">offset</span><span class="tok-p">)</span> <span class="tok-o"><<</span> <span class="tok-s">"]</span><span class="tok-se">\n\n</span><span class="tok-s">"</span><span class="tok-p">;</span> +<span class="tok-p">}</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Sometimes XML data should be loaded from some other source than file, i.e. HTTP URL; also you may want to load XML data from file using non-standard functions, i.e. to use your virtual file system facilities or to load XML from gzip-compressed files. These scenarios either require loading document from memory, in which case you should prepare a contiguous memory block with all XML data and to pass it to one of buffer loading functions, or loading document from C++ IOstream, in which case you should provide an object which implements <code>std::istream</code> or <code>std::wistream</code> interface.</p> +</div> +<div class="paragraph"> +<p>There are different functions for loading document from memory; they treat the passed buffer as either an immutable one (<code>load_buffer</code>), a mutable buffer which is owned by the caller (<code>load_buffer_inplace</code>), or a mutable buffer which ownership belongs to pugixml (<code>load_buffer_inplace_own</code>). There is also a simple helper function, <code>xml_document::load</code>, for cases when you want to load the XML document from null-terminated character string.</p> +</div> +<div class="paragraph"> +<p>This is an example of loading XML document from memory using one of these functions (<a href="samples/load_memory.cpp" class="bare">samples/load_memory.cpp</a>); read the sample code for more examples:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-k">const</span> <span class="tok-kt">char</span> <span class="tok-n">source</span><span class="tok-p">[]</span> <span class="tok-o">=</span> <span class="tok-s">"<mesh name='sphere'><bounds>0 0 1 1</bounds></mesh>"</span><span class="tok-p">;</span> +<span class="tok-kt">size_t</span> <span class="tok-n">size</span> <span class="tok-o">=</span> <span class="tok-k">sizeof</span><span class="tok-p">(</span><span class="tok-n">source</span><span class="tok-p">);</span></code></pre> +</div> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-c1">// You can use load_buffer_inplace to load document from mutable memory block; the block's lifetime must exceed that of document</span> +<span class="tok-kt">char</span><span class="tok-o">*</span> <span class="tok-n">buffer</span> <span class="tok-o">=</span> <span class="tok-k">new</span> <span class="tok-kt">char</span><span class="tok-p">[</span><span class="tok-n">size</span><span class="tok-p">];</span> +<span class="tok-n">memcpy</span><span class="tok-p">(</span><span class="tok-n">buffer</span><span class="tok-p">,</span> <span class="tok-n">source</span><span class="tok-p">,</span> <span class="tok-n">size</span><span class="tok-p">);</span> + +<span class="tok-c1">// The block can be allocated by any method; the block is modified during parsing</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_parse_result</span> <span class="tok-n">result</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">load_buffer_inplace</span><span class="tok-p">(</span><span class="tok-n">buffer</span><span class="tok-p">,</span> <span class="tok-n">size</span><span class="tok-p">);</span> + +<span class="tok-c1">// You have to destroy the block yourself after the document is no longer used</span> +<span class="tok-k">delete</span><span class="tok-p">[]</span> <span class="tok-n">buffer</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>This is a simple example of loading XML document from file using streams (<a href="samples/load_stream.cpp" class="bare">samples/load_stream.cpp</a>); read the sample code for more complex examples involving wide streams and locales:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">ifstream</span> <span class="tok-n">stream</span><span class="tok-p">(</span><span class="tok-s">"weekly-utf-8.xml"</span><span class="tok-p">);</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_parse_result</span> <span class="tok-n">result</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">load</span><span class="tok-p">(</span><span class="tok-n">stream</span><span class="tok-p">);</span></code></pre> +</div> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="access"><a class="anchor" href="#access"></a>Accessing document data</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>pugixml features an extensive interface for getting various types of data from the document and for traversing the document. You can use various accessors to get node/attribute data, you can traverse the child node/attribute lists via accessors or iterators, you can do depth-first traversals with <code>xml_tree_walker</code> objects, and you can use XPath for complex data-driven queries.</p> +</div> +<div class="paragraph"> +<p>You can get node or attribute name via <code>name()</code> accessor, and value via <code>value()</code> accessor. Note that both functions never return null pointers - they either return a string with the relevant content, or an empty string if name/value is absent or if the handle is null. Also there are two notable things for reading values:</p> +</div> +<div class="ulist"> +<ul> +<li> +<p>It is common to store data as text contents of some node - i.e. <code><node><description>This is a node</description></node></code>. In this case, <code><description></code> node does not have a value, but instead has a child of type <code>node_pcdata</code> with value <code>"This is a node"</code>. pugixml provides <code>child_value()</code> and <code>text()</code> helper functions to parse such data.</p> +</li> +<li> +<p>In many cases attribute values have types that are not strings - i.e. an attribute may always contain values that should be treated as integers, despite the fact that they are represented as strings in XML. pugixml provides several accessors that convert attribute value to some other type.</p> +</li> +</ul> +</div> +<div class="paragraph"> +<p>This is an example of using these functions (<a href="samples/traverse_base.cpp" class="bare">samples/traverse_base.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">tool</span> <span class="tok-o">=</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"Tool"</span><span class="tok-p">);</span> <span class="tok-n">tool</span><span class="tok-p">;</span> <span class="tok-n">tool</span> <span class="tok-o">=</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">next_sibling</span><span class="tok-p">(</span><span class="tok-s">"Tool"</span><span class="tok-p">))</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Tool "</span> <span class="tok-o"><<</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"Filename"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">();</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">": AllowRemote "</span> <span class="tok-o"><<</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"AllowRemote"</span><span class="tok-p">).</span><span class="tok-n">as_bool</span><span class="tok-p">();</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">", Timeout "</span> <span class="tok-o"><<</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"Timeout"</span><span class="tok-p">).</span><span class="tok-n">as_int</span><span class="tok-p">();</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">", Description '"</span> <span class="tok-o"><<</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">child_value</span><span class="tok-p">(</span><span class="tok-s">"Description"</span><span class="tok-p">)</span> <span class="tok-o"><<</span> <span class="tok-s">"'</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> +<span class="tok-p">}</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Since a lot of document traversal consists of finding the node/attribute with the correct name, there are special functions for that purpose. For example, <code>child("Tool")</code> returns the first node which has the name <code>"Tool"</code>, or null handle if there is no such node. This is an example of using such functions (<a href="samples/traverse_base.cpp" class="bare">samples/traverse_base.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Tool for *.dae generation: "</span> <span class="tok-o"><<</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">find_child_by_attribute</span><span class="tok-p">(</span><span class="tok-s">"Tool"</span><span class="tok-p">,</span> <span class="tok-s">"OutputFileMasks"</span><span class="tok-p">,</span> <span class="tok-s">"*.dae"</span><span class="tok-p">).</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"Filename"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> + +<span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">tool</span> <span class="tok-o">=</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"Tool"</span><span class="tok-p">);</span> <span class="tok-n">tool</span><span class="tok-p">;</span> <span class="tok-n">tool</span> <span class="tok-o">=</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">next_sibling</span><span class="tok-p">(</span><span class="tok-s">"Tool"</span><span class="tok-p">))</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Tool "</span> <span class="tok-o"><<</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"Filename"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> +<span class="tok-p">}</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Child node lists and attribute lists are simply double-linked lists; while you can use <code>previous_sibling</code>/<code>next_sibling</code> and other such functions for iteration, pugixml additionally provides node and attribute iterators, so that you can treat nodes as containers of other nodes or attributes. All iterators are bidirectional and support all usual iterator operations. The iterators are invalidated if the node/attribute objects they’re pointing to are removed from the tree; adding nodes/attributes does not invalidate any iterators.</p> +</div> +<div class="paragraph"> +<p>Here is an example of using iterators for document traversal (<a href="samples/traverse_iter.cpp" class="bare">samples/traverse_iter.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node_iterator</span> <span class="tok-n">it</span> <span class="tok-o">=</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">begin</span><span class="tok-p">();</span> <span class="tok-n">it</span> <span class="tok-o">!=</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">end</span><span class="tok-p">();</span> <span class="tok-o">++</span><span class="tok-n">it</span><span class="tok-p">)</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Tool:"</span><span class="tok-p">;</span> + + <span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_attribute_iterator</span> <span class="tok-n">ait</span> <span class="tok-o">=</span> <span class="tok-n">it</span><span class="tok-o">-></span><span class="tok-n">attributes_begin</span><span class="tok-p">();</span> <span class="tok-n">ait</span> <span class="tok-o">!=</span> <span class="tok-n">it</span><span class="tok-o">-></span><span class="tok-n">attributes_end</span><span class="tok-p">();</span> <span class="tok-o">++</span><span class="tok-n">ait</span><span class="tok-p">)</span> + <span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">" "</span> <span class="tok-o"><<</span> <span class="tok-n">ait</span><span class="tok-o">-></span><span class="tok-n">name</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"="</span> <span class="tok-o"><<</span> <span class="tok-n">ait</span><span class="tok-o">-></span><span class="tok-n">value</span><span class="tok-p">();</span> + <span class="tok-p">}</span> + + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span> +<span class="tok-p">}</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>If your C++ compiler supports range-based for-loop (this is a C++11 feature, at the time of writing it’s supported by Microsoft Visual Studio 11 Beta, GCC 4.6 and Clang 3.0), you can use it to enumerate nodes/attributes. Additional helpers are provided to support this; note that they are also compatible with <a href="http://www.boost.org/libs/foreach/">Boost Foreach</a>, and possibly other pre-C++11 foreach facilities.</p> +</div> +<div class="paragraph"> +<p>Here is an example of using C++11 range-based for loop for document traversal (<a href="samples/traverse_rangefor.cpp" class="bare">samples/traverse_rangefor.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-nl">tool</span><span class="tok-p">:</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">children</span><span class="tok-p">(</span><span class="tok-s">"Tool"</span><span class="tok-p">))</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Tool:"</span><span class="tok-p">;</span> + + <span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_attribute</span> <span class="tok-nl">attr</span><span class="tok-p">:</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">attributes</span><span class="tok-p">())</span> + <span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">" "</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">name</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"="</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">value</span><span class="tok-p">();</span> + <span class="tok-p">}</span> + + <span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-nl">child</span><span class="tok-p">:</span> <span class="tok-n">tool</span><span class="tok-p">.</span><span class="tok-n">children</span><span class="tok-p">())</span> + <span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">", child "</span> <span class="tok-o"><<</span> <span class="tok-n">child</span><span class="tok-p">.</span><span class="tok-n">name</span><span class="tok-p">();</span> + <span class="tok-p">}</span> + + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span> +<span class="tok-p">}</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>The methods described above allow traversal of immediate children of some node; if you want to do a deep tree traversal, you’ll have to do it via a recursive function or some equivalent method. However, pugixml provides a helper for depth-first traversal of a subtree. In order to use it, you have to implement <code>xml_tree_walker</code> interface and to call <code>traverse</code> function.</p> +</div> +<div class="paragraph"> +<p>This is an example of traversing tree hierarchy with xml_tree_walker (<a href="samples/traverse_walker.cpp" class="bare">samples/traverse_walker.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-k">struct</span> <span class="tok-nl">simple_walker</span><span class="tok-p">:</span> <span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_tree_walker</span> +<span class="tok-p">{</span> + <span class="tok-k">virtual</span> <span class="tok-kt">bool</span> <span class="tok-n">for_each</span><span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span><span class="tok-o">&</span> <span class="tok-n">node</span><span class="tok-p">)</span> + <span class="tok-p">{</span> + <span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-kt">int</span> <span class="tok-n">i</span> <span class="tok-o">=</span> <span class="tok-mi">0</span><span class="tok-p">;</span> <span class="tok-n">i</span> <span class="tok-o"><</span> <span class="tok-n">depth</span><span class="tok-p">();</span> <span class="tok-o">++</span><span class="tok-n">i</span><span class="tok-p">)</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">" "</span><span class="tok-p">;</span> <span class="tok-c1">// indentation</span> + + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">node_types</span><span class="tok-p">[</span><span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">type</span><span class="tok-p">()]</span> <span class="tok-o"><<</span> <span class="tok-s">": name='"</span> <span class="tok-o"><<</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">name</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"', value='"</span> <span class="tok-o"><<</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"'</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> + + <span class="tok-k">return</span> <span class="tok-nb">true</span><span class="tok-p">;</span> <span class="tok-c1">// continue traversal</span> + <span class="tok-p">}</span> +<span class="tok-p">};</span></code></pre> +</div> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">simple_walker</span> <span class="tok-n">walker</span><span class="tok-p">;</span> +<span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">traverse</span><span class="tok-p">(</span><span class="tok-n">walker</span><span class="tok-p">);</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Finally, for complex queries often a higher-level DSL is needed. pugixml provides an implementation of XPath 1.0 language for such queries. The complete description of XPath usage can be found in the manual, but here are some examples:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xpath_node_set</span> <span class="tok-n">tools</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">select_nodes</span><span class="tok-p">(</span><span class="tok-s">"/Profile/Tools/Tool[@AllowRemote='true' and @DeriveCaptionFrom='lastparam']"</span><span class="tok-p">);</span> + +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Tools:</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> + +<span class="tok-k">for</span> <span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xpath_node_set</span><span class="tok-o">::</span><span class="tok-n">const_iterator</span> <span class="tok-n">it</span> <span class="tok-o">=</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">begin</span><span class="tok-p">();</span> <span class="tok-n">it</span> <span class="tok-o">!=</span> <span class="tok-n">tools</span><span class="tok-p">.</span><span class="tok-n">end</span><span class="tok-p">();</span> <span class="tok-o">++</span><span class="tok-n">it</span><span class="tok-p">)</span> +<span class="tok-p">{</span> + <span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xpath_node</span> <span class="tok-n">node</span> <span class="tok-o">=</span> <span class="tok-o">*</span><span class="tok-n">it</span><span class="tok-p">;</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">node</span><span class="tok-p">().</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"Filename"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> +<span class="tok-p">}</span> + +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xpath_node</span> <span class="tok-n">build_tool</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">select_node</span><span class="tok-p">(</span><span class="tok-s">"//Tool[contains(Description, 'build system')]"</span><span class="tok-p">);</span> + +<span class="tok-k">if</span> <span class="tok-p">(</span><span class="tok-n">build_tool</span><span class="tok-p">)</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Build tool: "</span> <span class="tok-o"><<</span> <span class="tok-n">build_tool</span><span class="tok-p">.</span><span class="tok-n">node</span><span class="tok-p">().</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"Filename"</span><span class="tok-p">).</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="admonitionblock caution"> +<table> <tr> -<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="images/caution.png"></td> -<th align="left">Caution</th> +<td class="icon"> +<div class="title">Caution</div> +</td> +<td class="content"> +XPath functions throw <code>xpath_exception</code> objects on error; the sample above does not catch these exceptions. +</td> </tr> -<tr><td align="left" valign="top"><p> - XPath functions throw <code class="computeroutput"><span class="identifier">xpath_exception</span></code> - objects on error; the sample above does not catch these exceptions. - </p></td></tr> -</table></div> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.modify"></a><a class="link" href="quickstart.html#quickstart.main.modify" title="Modifying document data"> Modifying document data</a> -</h3></div></div></div> -<p> - The document in pugixml is fully mutable: you can completely change the document - structure and modify the data of nodes/attributes. All functions take care - of memory management and structural integrity themselves, so they always - result in structurally valid tree - however, it is possible to create an - invalid XML tree (for example, by adding two attributes with the same name - or by setting attribute/node name to empty/invalid string). Tree modification - is optimized for performance and for memory consumption, so if you have enough - memory you can create documents from scratch with pugixml and later save - them to file/stream instead of relying on error-prone manual text writing - and without too much overhead. - </p> -<p> - All member functions that change node/attribute data or structure are non-constant - and thus can not be called on constant handles. However, you can easily convert - constant handle to non-constant one by simple assignment: <code class="computeroutput"><span class="keyword">void</span> - <span class="identifier">foo</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">nc</span> <span class="special">=</span> <span class="identifier">n</span><span class="special">;</span> <span class="special">}</span></code>, so const-correctness - here mainly provides additional documentation. - </p> -<p> - As discussed before, nodes can have name and value, both of which are strings. - Depending on node type, name or value may be absent. You can use <code class="computeroutput"><span class="identifier">set_name</span></code> and <code class="computeroutput"><span class="identifier">set_value</span></code> - member functions to set them. Similar functions are available for attributes; - however, the <code class="computeroutput"><span class="identifier">set_value</span></code> function - is overloaded for some other types except strings, like floating-point numbers. - Also, attribute value can be set using an assignment operator. This is an - example of setting node/attribute name and value (<a href="samples/modify_base.cpp" target="_top">samples/modify_base.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">);</span> - -<span class="comment">// change node name -</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">set_name</span><span class="special">(</span><span class="string">"notnode"</span><span class="special">);</span> -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", new node name: "</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> - -<span class="comment">// change comment text -</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">last_child</span><span class="special">().</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"useless comment"</span><span class="special">);</span> -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", new comment text: "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">last_child</span><span class="special">().</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> - -<span class="comment">// we can't change value of the element or name of the comment -</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"1"</span><span class="special">)</span> <span class="special"><<</span> <span class="string">", "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">last_child</span><span class="special">().</span><span class="identifier">set_name</span><span class="special">(</span><span class="string">"2"</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> -</pre> -<p> - </p> -<p> - -</p> -<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_attribute</span> <span class="identifier">attr</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"id"</span><span class="special">);</span> - -<span class="comment">// change attribute name/value -</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">set_name</span><span class="special">(</span><span class="string">"key"</span><span class="special">)</span> <span class="special"><<</span> <span class="string">", "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"345"</span><span class="special">);</span> -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", new attribute: "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"="</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> - -<span class="comment">// we can use numbers or booleans -</span><span class="identifier">attr</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="number">1.234</span><span class="special">);</span> -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"new attribute value: "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> - -<span class="comment">// we can also use assignment operators for more concise code -</span><span class="identifier">attr</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span> -<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"final attribute value: "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> -</pre> -<p> - </p> -<p> - Nodes and attributes do not exist without a document tree, so you can't create - them without adding them to some document. A node or attribute can be created - at the end of node/attribute list or before/after some other node. All insertion - functions return the handle to newly created object on success, and null - handle on failure. Even if the operation fails (for example, if you're trying - to add a child node to PCDATA node), the document remains in consistent state, - but the requested node/attribute is not added. - </p> -<div class="caution"><table border="0" summary="Caution"> +</table> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="modify"><a class="anchor" href="#modify"></a>Modifying document data</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>The document in pugixml is fully mutable: you can completely change the document structure and modify the data of nodes/attributes. All functions take care of memory management and structural integrity themselves, so they always result in structurally valid tree - however, it is possible to create an invalid XML tree (for example, by adding two attributes with the same name or by setting attribute/node name to empty/invalid string). Tree modification is optimized for performance and for memory consumption, so if you have enough memory you can create documents from scratch with pugixml and later save them to file/stream instead of relying on error-prone manual text writing and without too much overhead.</p> +</div> +<div class="paragraph"> +<p>All member functions that change node/attribute data or structure are non-constant and thus can not be called on constant handles. However, you can easily convert constant handle to non-constant one by simple assignment: <code>void foo(const pugi::xml_node& n) { pugi::xml_node nc = n; }</code>, so const-correctness here mainly provides additional documentation.</p> +</div> +<div class="paragraph"> +<p>As discussed before, nodes can have name and value, both of which are strings. Depending on node type, name or value may be absent. You can use <code>set_name</code> and <code>set_value</code> member functions to set them. Similar functions are available for attributes; however, the <code>set_value</code> function is overloaded for some other types except strings, like floating-point numbers. Also, attribute value can be set using an assignment operator. This is an example of setting node/attribute name and value (<a href="samples/modify_base.cpp" class="bare">samples/modify_base.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">node</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"node"</span><span class="tok-p">);</span> + +<span class="tok-c1">// change node name</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">set_name</span><span class="tok-p">(</span><span class="tok-s">"notnode"</span><span class="tok-p">);</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">", new node name: "</span> <span class="tok-o"><<</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">name</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span> + +<span class="tok-c1">// change comment text</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">last_child</span><span class="tok-p">().</span><span class="tok-n">set_value</span><span class="tok-p">(</span><span class="tok-s">"useless comment"</span><span class="tok-p">);</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">", new comment text: "</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">last_child</span><span class="tok-p">().</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span> + +<span class="tok-c1">// we can't change value of the element or name of the comment</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">set_value</span><span class="tok-p">(</span><span class="tok-s">"1"</span><span class="tok-p">)</span> <span class="tok-o"><<</span> <span class="tok-s">", "</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">last_child</span><span class="tok-p">().</span><span class="tok-n">set_name</span><span class="tok-p">(</span><span class="tok-s">"2"</span><span class="tok-p">)</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_attribute</span> <span class="tok-n">attr</span> <span class="tok-o">=</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"id"</span><span class="tok-p">);</span> + +<span class="tok-c1">// change attribute name/value</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">set_name</span><span class="tok-p">(</span><span class="tok-s">"key"</span><span class="tok-p">)</span> <span class="tok-o"><<</span> <span class="tok-s">", "</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">set_value</span><span class="tok-p">(</span><span class="tok-s">"345"</span><span class="tok-p">);</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">", new attribute: "</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">name</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-s">"="</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span> + +<span class="tok-c1">// we can use numbers or booleans</span> +<span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">set_value</span><span class="tok-p">(</span><span class="tok-mf">1.234</span><span class="tok-p">);</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"new attribute value: "</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span> + +<span class="tok-c1">// we can also use assignment operators for more concise code</span> +<span class="tok-n">attr</span> <span class="tok-o">=</span> <span class="tok-nb">true</span><span class="tok-p">;</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"final attribute value: "</span> <span class="tok-o"><<</span> <span class="tok-n">attr</span><span class="tok-p">.</span><span class="tok-n">value</span><span class="tok-p">()</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>Nodes and attributes do not exist without a document tree, so you can’t create them without adding them to some document. A node or attribute can be created at the end of node/attribute list or before/after some other node. All insertion functions return the handle to newly created object on success, and null handle on failure. Even if the operation fails (for example, if you’re trying to add a child node to PCDATA node), the document remains in consistent state, but the requested node/attribute is not added.</p> +</div> +<div class="admonitionblock caution"> +<table> <tr> -<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="images/caution.png"></td> -<th align="left">Caution</th> +<td class="icon"> +<div class="title">Caution</div> +</td> +<td class="content"> +<code>attribute()</code> and <code>child()</code> functions do not add attributes or nodes to the tree, so code like <code>node.attribute("id") = 123;</code> will not do anything if <code>node</code> does not have an attribute with name <code>"id"</code>. Make sure you’re operating with existing attributes/nodes by adding them if necessary. +</td> </tr> -<tr><td align="left" valign="top"><p> - attribute() and child() functions do not add attributes or nodes to the - tree, so code like <code class="computeroutput"><span class="identifier">node</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"id"</span><span class="special">)</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span></code> will not do anything if <code class="computeroutput"><span class="identifier">node</span></code> does not have an attribute with - name <code class="computeroutput"><span class="string">"id"</span></code>. Make sure - you're operating with existing attributes/nodes by adding them if necessary. - </p></td></tr> -</table></div> -<p> - This is an example of adding new attributes/nodes to the document (<a href="samples/modify_add.cpp" target="_top">samples/modify_add.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="comment">// add node with some name -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="string">"node"</span><span class="special">);</span> - -<span class="comment">// add description node with text child -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">descr</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="string">"description"</span><span class="special">);</span> -<span class="identifier">descr</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">node_pcdata</span><span class="special">).</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"Simple node"</span><span class="special">);</span> - -<span class="comment">// add param node before the description -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">param</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">insert_child_before</span><span class="special">(</span><span class="string">"param"</span><span class="special">,</span> <span class="identifier">descr</span><span class="special">);</span> - -<span class="comment">// add attributes to param node -</span><span class="identifier">param</span><span class="special">.</span><span class="identifier">append_attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">)</span> <span class="special">=</span> <span class="string">"version"</span><span class="special">;</span> -<span class="identifier">param</span><span class="special">.</span><span class="identifier">append_attribute</span><span class="special">(</span><span class="string">"value"</span><span class="special">)</span> <span class="special">=</span> <span class="number">1.1</span><span class="special">;</span> -<span class="identifier">param</span><span class="special">.</span><span class="identifier">insert_attribute_after</span><span class="special">(</span><span class="string">"type"</span><span class="special">,</span> <span class="identifier">param</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">))</span> <span class="special">=</span> <span class="string">"float"</span><span class="special">;</span> -</pre> -<p> - </p> -<p> - If you do not want your document to contain some node or attribute, you can - remove it with <code class="computeroutput"><span class="identifier">remove_attribute</span></code> - and <code class="computeroutput"><span class="identifier">remove_child</span></code> functions. - Removing the attribute or node invalidates all handles to the same underlying - object, and also invalidates all iterators pointing to the same object. Removing - node also invalidates all past-the-end iterators to its attribute or child - node list. Be careful to ensure that all such handles and iterators either - do not exist or are not used after the attribute/node is removed. - </p> -<p> - This is an example of removing attributes/nodes from the document (<a href="samples/modify_remove.cpp" target="_top">samples/modify_remove.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="comment">// remove description node with the whole subtree -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">);</span> -<span class="identifier">node</span><span class="special">.</span><span class="identifier">remove_child</span><span class="special">(</span><span class="string">"description"</span><span class="special">);</span> - -<span class="comment">// remove id attribute -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">param</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"param"</span><span class="special">);</span> -<span class="identifier">param</span><span class="special">.</span><span class="identifier">remove_attribute</span><span class="special">(</span><span class="string">"value"</span><span class="special">);</span> - -<span class="comment">// we can also remove nodes/attributes by handles -</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_attribute</span> <span class="identifier">id</span> <span class="special">=</span> <span class="identifier">param</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">);</span> -<span class="identifier">param</span><span class="special">.</span><span class="identifier">remove_attribute</span><span class="special">(</span><span class="identifier">id</span><span class="special">);</span> -</pre> -<p> - </p> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.saving"></a><a class="link" href="quickstart.html#quickstart.main.saving" title="Saving document"> Saving document</a> -</h3></div></div></div> -<p> - Often after creating a new document or loading the existing one and processing - it, it is necessary to save the result back to file. Also it is occasionally - useful to output the whole document or a subtree to some stream; use cases - include debug printing, serialization via network or other text-oriented - medium, etc. pugixml provides several functions to output any subtree of - the document to a file, stream or another generic transport interface; these - functions allow to customize the output format, and also perform necessary - encoding conversions. - </p> -<p> - Before writing to the destination the node/attribute data is properly formatted - according to the node type; all special XML symbols, such as < and &, - are properly escaped. In order to guard against forgotten node/attribute - names, empty node/attribute names are printed as <code class="computeroutput"><span class="string">":anonymous"</span></code>. - For well-formed output, make sure all node and attribute names are set to - meaningful values. - </p> -<p> - If you want to save the whole document to a file, you can use the <code class="computeroutput"><span class="identifier">save_file</span></code> function, which returns <code class="computeroutput"><span class="keyword">true</span></code> on success. This is a simple example - of saving XML document to file (<a href="samples/save_file.cpp" target="_top">samples/save_file.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="comment">// save document to file -</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Saving result: "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">save_file</span><span class="special">(</span><span class="string">"save_file_output.xml"</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> -</pre> -<p> - </p> -<p> - To enhance interoperability pugixml provides functions for saving document - to any object which implements C++ <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span></code> - interface. This allows you to save documents to any standard C++ stream (i.e. - file stream) or any third-party compliant implementation (i.e. Boost Iostreams). - Most notably, this allows for easy debug output, since you can use <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span></code> - stream as saving target. There are two functions, one works with narrow character - streams, another handles wide character ones. - </p> -<p> - This is a simple example of saving XML document to standard output (<a href="samples/save_stream.cpp" target="_top">samples/save_stream.cpp</a>): - </p> -<p> - -</p> -<pre class="programlisting"><span class="comment">// save document to standard output -</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Document:\n"</span><span class="special">;</span> -<span class="identifier">doc</span><span class="special">.</span><span class="identifier">save</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">);</span> -</pre> -<p> - </p> -<p> - All of the above saving functions are implemented in terms of writer interface. - This is a simple interface with a single function, which is called several - times during output process with chunks of document data as input. In order - to output the document via some custom transport, for example sockets, you - should create an object which implements <code class="computeroutput"><span class="identifier">xml_writer_file</span></code> - interface and pass it to <code class="computeroutput"><span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save</span></code> - function. - </p> -<p> - This is a simple example of custom writer for saving document data to STL - string (<a href="samples/save_custom_writer.cpp" target="_top">samples/save_custom_writer.cpp</a>); - read the sample code for more complex examples: - </p> -<p> - -</p> -<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xml_string_writer</span><span class="special">:</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_writer</span> -<span class="special">{</span> - <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">result</span><span class="special">;</span> - - <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">write</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*</span> <span class="identifier">data</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">)</span> - <span class="special">{</span> - <span class="identifier">result</span> <span class="special">+=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="keyword">static_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">size</span><span class="special">);</span> - <span class="special">}</span> -<span class="special">};</span> -</pre> -<p> - </p> -<p> - While the previously described functions save the whole document to the destination, - it is easy to save a single subtree. Instead of calling <code class="computeroutput"><span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">save</span></code>, - just call <code class="computeroutput"><span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">print</span></code> function on the target node. You - can save node contents to C++ IOstream object or custom writer in this way. - Saving a subtree slightly differs from saving the whole document; <a href="manual/saving.html#manual.saving.subtree" target="_top">read the manual</a> for - more information. - </p> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.feedback"></a><a class="link" href="quickstart.html#quickstart.main.feedback" title="Feedback"> Feedback</a> -</h3></div></div></div> -<p> - If you believe you've found a bug in pugixml, please file an issue via <a href="http://code.google.com/p/pugixml/issues/entry" target="_top">issue submission form</a>. - Be sure to include the relevant information so that the bug can be reproduced: - the version of pugixml, compiler version and target architecture, the code - that uses pugixml and exhibits the bug, etc. Feature requests and contributions - can be filed as issues, too. - </p> -<a name="email"></a><p> - If filing an issue is not possible due to privacy or other concerns, you - can contact pugixml author by e-mail directly: <a href="mailto:arseny.kapoulkine@gmail.com" target="_top">arseny.kapoulkine@gmail.com</a>. - </p> -</div> -<div class="section"> -<div class="titlepage"><div><div><h3 class="title"> -<a name="quickstart.main.license"></a><a class="link" href="quickstart.html#quickstart.main.license" title="License"> License</a> -</h3></div></div></div> -<p> - The pugixml library is distributed under the MIT license: - </p> -<div class="blockquote"><blockquote class="blockquote"> -<p> - Copyright (c) 2006-2014 Arseny Kapoulkine - </p> -<p> - Permission is hereby granted, free of charge, to any person obtaining a - copy of this software and associated documentation files (the "Software"), - to deal in the Software without restriction, including without limitation - the rights to use, copy, modify, merge, publish, distribute, sublicense, - and/or sell copies of the Software, and to permit persons to whom the Software - is furnished to do so, subject to the following conditions: - </p> -<p> - The above copyright notice and this permission notice shall be included - in all copies or substantial portions of the Software. - </p> -<p> - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS - IN THE SOFTWARE. - </p> -</blockquote></div> -<p> - This means that you can freely use pugixml in your applications, both open-source - and proprietary. If you use pugixml in a product, it is sufficient to add - an acknowledgment like this to the product distribution: - </p> -<div class="blockquote"><blockquote class="blockquote"><p> - This software is based on pugixml library (http://pugixml.org).<br> -pugixml - is Copyright (C) 2006-2014 Arseny Kapoulkine. - </p></blockquote></div> -</div> -</div> -<div class="footnotes"> -<br><hr style="width:100; text-align:left;margin-left: 0"> -<div id="ftn.trademarks" class="footnote"><p><a href="#trademarks" class="para"><sup class="para">[1] </sup></a>All trademarks used are properties of their respective owners.</p></div> -</div> -</div> -<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> -<td align="left"><p><small>Last revised: November 18, 2014 at 17:25:31 GMT</small></p></td> -<td align="right"><div class="copyright-footer"></div></td> -</tr></table> +</table> +</div> +<div class="paragraph"> +<p>This is an example of adding new attributes/nodes to the document (<a href="samples/modify_add.cpp" class="bare">samples/modify_add.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-c1">// add node with some name</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">node</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">append_child</span><span class="tok-p">(</span><span class="tok-s">"node"</span><span class="tok-p">);</span> + +<span class="tok-c1">// add description node with text child</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">descr</span> <span class="tok-o">=</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">append_child</span><span class="tok-p">(</span><span class="tok-s">"description"</span><span class="tok-p">);</span> +<span class="tok-n">descr</span><span class="tok-p">.</span><span class="tok-n">append_child</span><span class="tok-p">(</span><span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">node_pcdata</span><span class="tok-p">).</span><span class="tok-n">set_value</span><span class="tok-p">(</span><span class="tok-s">"Simple node"</span><span class="tok-p">);</span> + +<span class="tok-c1">// add param node before the description</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">param</span> <span class="tok-o">=</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">insert_child_before</span><span class="tok-p">(</span><span class="tok-s">"param"</span><span class="tok-p">,</span> <span class="tok-n">descr</span><span class="tok-p">);</span> + +<span class="tok-c1">// add attributes to param node</span> +<span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">append_attribute</span><span class="tok-p">(</span><span class="tok-s">"name"</span><span class="tok-p">)</span> <span class="tok-o">=</span> <span class="tok-s">"version"</span><span class="tok-p">;</span> +<span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">append_attribute</span><span class="tok-p">(</span><span class="tok-s">"value"</span><span class="tok-p">)</span> <span class="tok-o">=</span> <span class="tok-mf">1.1</span><span class="tok-p">;</span> +<span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">insert_attribute_after</span><span class="tok-p">(</span><span class="tok-s">"type"</span><span class="tok-p">,</span> <span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"name"</span><span class="tok-p">))</span> <span class="tok-o">=</span> <span class="tok-s">"float"</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>If you do not want your document to contain some node or attribute, you can remove it with <code>remove_attribute</code> and <code>remove_child</code> functions. Removing the attribute or node invalidates all handles to the same underlying object, and also invalidates all iterators pointing to the same object. Removing node also invalidates all past-the-end iterators to its attribute or child node list. Be careful to ensure that all such handles and iterators either do not exist or are not used after the attribute/node is removed.</p> +</div> +<div class="paragraph"> +<p>This is an example of removing attributes/nodes from the document (<a href="samples/modify_remove.cpp" class="bare">samples/modify_remove.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-c1">// remove description node with the whole subtree</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">node</span> <span class="tok-o">=</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"node"</span><span class="tok-p">);</span> +<span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">remove_child</span><span class="tok-p">(</span><span class="tok-s">"description"</span><span class="tok-p">);</span> + +<span class="tok-c1">// remove id attribute</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_node</span> <span class="tok-n">param</span> <span class="tok-o">=</span> <span class="tok-n">node</span><span class="tok-p">.</span><span class="tok-n">child</span><span class="tok-p">(</span><span class="tok-s">"param"</span><span class="tok-p">);</span> +<span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">remove_attribute</span><span class="tok-p">(</span><span class="tok-s">"value"</span><span class="tok-p">);</span> + +<span class="tok-c1">// we can also remove nodes/attributes by handles</span> +<span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_attribute</span> <span class="tok-n">id</span> <span class="tok-o">=</span> <span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">attribute</span><span class="tok-p">(</span><span class="tok-s">"name"</span><span class="tok-p">);</span> +<span class="tok-n">param</span><span class="tok-p">.</span><span class="tok-n">remove_attribute</span><span class="tok-p">(</span><span class="tok-n">id</span><span class="tok-p">);</span></code></pre> +</div> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="saving"><a class="anchor" href="#saving"></a>Saving document</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>Often after creating a new document or loading the existing one and processing it, it is necessary to save the result back to file. Also it is occasionally useful to output the whole document or a subtree to some stream; use cases include debug printing, serialization via network or other text-oriented medium, etc. pugixml provides several functions to output any subtree of the document to a file, stream or another generic transport interface; these functions allow to customize the output format, and also perform necessary encoding conversions.</p> +</div> +<div class="paragraph"> +<p>Before writing to the destination the node/attribute data is properly formatted according to the node type; all special XML symbols, such as < and &, are properly escaped. In order to guard against forgotten node/attribute names, empty node/attribute names are printed as <code>":anonymous"</code>. For well-formed output, make sure all node and attribute names are set to meaningful values.</p> +</div> +<div class="paragraph"> +<p>If you want to save the whole document to a file, you can use the <code>save_file</code> function, which returns <code>true</code> on success. This is a simple example of saving XML document to file (<a href="samples/save_file.cpp" class="bare">samples/save_file.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-c1">// save document to file</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Saving result: "</span> <span class="tok-o"><<</span> <span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">save_file</span><span class="tok-p">(</span><span class="tok-s">"save_file_output.xml"</span><span class="tok-p">)</span> <span class="tok-o"><<</span> <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">endl</span><span class="tok-p">;</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>To enhance interoperability pugixml provides functions for saving document to any object which implements C++ <code>std::ostream</code> interface. This allows you to save documents to any standard C++ stream (i.e. file stream) or any third-party compliant implementation (i.e. Boost Iostreams). Most notably, this allows for easy debug output, since you can use <code>std::cout</code> stream as saving target. There are two functions, one works with narrow character streams, another handles wide character ones.</p> +</div> +<div class="paragraph"> +<p>This is a simple example of saving XML document to standard output (<a href="samples/save_stream.cpp" class="bare">samples/save_stream.cpp</a>):</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-c1">// save document to standard output</span> +<span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span> <span class="tok-o"><<</span> <span class="tok-s">"Document:</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">;</span> +<span class="tok-n">doc</span><span class="tok-p">.</span><span class="tok-n">save</span><span class="tok-p">(</span><span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">cout</span><span class="tok-p">);</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>All of the above saving functions are implemented in terms of writer interface. This is a simple interface with a single function, which is called several times during output process with chunks of document data as input. In order to output the document via some custom transport, for example sockets, you should create an object which implements <code>xml_writer_file</code> interface and pass it to <code>xml_document::save</code> function.</p> +</div> +<div class="paragraph"> +<p>This is a simple example of custom writer for saving document data to STL string (<a href="samples/save_custom_writer.cpp" class="bare">samples/save_custom_writer.cpp</a>); read the sample code for more complex examples:</p> +</div> +<div class="listingblock"> +<div class="content"> +<pre class="pygments highlight"><code data-lang="c++"><span class="tok-k">struct</span> <span class="tok-nl">xml_string_writer</span><span class="tok-p">:</span> <span class="tok-n">pugi</span><span class="tok-o">::</span><span class="tok-n">xml_writer</span> +<span class="tok-p">{</span> + <span class="tok-n">std</span><span class="tok-o">::</span><span class="tok-n">string</span> <span class="tok-n">result</span><span class="tok-p">;</span> + + <span class="tok-k">virtual</span> <span class="tok-kt">void</span> <span class="tok-nf">write</span><span class="tok-p">(</span><span class="tok-k">const</span> <span class="tok-kt">void</span><span class="tok-o">*</span> <span class="tok-n">data</span><span class="tok-p">,</span> <span class="tok-kt">size_t</span> <span class="tok-n">size</span><span class="tok-p">)</span> + <span class="tok-p">{</span> + <span class="tok-n">result</span><span class="tok-p">.</span><span class="tok-n">append</span><span class="tok-p">(</span><span class="tok-k">static_cast</span><span class="tok-o"><</span><span class="tok-k">const</span> <span class="tok-kt">char</span><span class="tok-o">*></span><span class="tok-p">(</span><span class="tok-n">data</span><span class="tok-p">),</span> <span class="tok-n">size</span><span class="tok-p">);</span> + <span class="tok-p">}</span> +<span class="tok-p">};</span></code></pre> +</div> +</div> +<div class="paragraph"> +<p>While the previously described functions save the whole document to the destination, it is easy to save a single subtree. Instead of calling <code>xml_document::save</code>, just call <code>xml_node::print</code> function on the target node. You can save node contents to C++ IOstream object or custom writer in this way. Saving a subtree slightly differs from saving the whole document; <a href="manual/saving.html#saving.subtree">read the manual</a> for more information.</p> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="feedback"><a class="anchor" href="#feedback"></a>Feedback</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>If you believe you’ve found a bug in pugixml, please file an issue via <a href="https://github.com/zeux/pugixml/issues/new">issue submission form</a>. Be sure to include the relevant information so that the bug can be reproduced: the version of pugixml, compiler version and target architecture, the code that uses pugixml and exhibits the bug, etc. Feature requests and contributions can be filed as issues, too.</p> +</div> +<div class="paragraph"> +<p>If filing an issue is not possible due to privacy or other concerns, you can contact pugixml author by e-mail directly: <a href="mailto:arseny.kapoulkine@gmail.com">arseny.kapoulkine@gmail.com</a>.</p> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="license"><a class="anchor" href="#license"></a>License</h2> +<div class="sectionbody"> +<div class="paragraph"> +<p>The pugixml library is distributed under the MIT license:</p> +</div> +<div class="literalblock"> +<div class="content"> +<pre>Copyright (c) 2006-2015 Arseny Kapoulkine + +Permission is hereby granted, free of charge, to any person +obtaining a copy of this software and associated documentation +files (the "Software"), to deal in the Software without +restriction, including without limitation the rights to use, +copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the +Software is furnished to do so, subject to the following +conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES +OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT +HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +OTHER DEALINGS IN THE SOFTWARE.</pre> +</div> +</div> +<div class="paragraph"> +<p>This means that you can freely use pugixml in your applications, both open-source and proprietary. If you use pugixml in a product, it is sufficient to add an acknowledgment like this to the product distribution:</p> +</div> +<div class="literalblock"> +<div class="content"> +<pre>This software is based on pugixml library (http://pugixml.org). +pugixml is Copyright (C) 2006-2015 Arseny Kapoulkine.</pre> +</div> +</div> +</div> +</div> +</div> +<div id="footnotes"> +<hr> +<div class="footnote" id="_footnote_1"> +<a href="#_footnoteref_1">1</a>. All trademarks used are properties of their respective owners. +</div> +</div> +<div id="footer"> +<div id="footer-text"> +Last updated 2015-03-24 20:19:09 PDT +</div> +</div> </body> -</html> +</html>
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