docs/samples/load_stream.cpp


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#include "pugixml.hpp"

#include <fstream>
#include <iomanip>
#include <iostream>

void print_doc(const char* message, const pugi::xml_document& doc, const pugi::xml_parse_result& result)
{
	std::cout
		<< message
		<< "\t: load result '" << result.description() << "'"
		<< ", first character of root name: U+" << std::hex << std::uppercase << std::setw(4) << std::setfill('0') << pugi::as_wide(doc.first_child().name())[0]
		<< ", year: " << doc.first_child().first_child().first_child().child_value()
		<< std::endl;
}

int main()
{
	pugi::xml_document doc;

	{
		std::ifstream stream("weekly-utf-8.xml");
		pugi::xml_parse_result result = doc.load(stream);

		// first character of root name: U+9031, year: 1997
		print_doc("UTF8 file from narrow stream", doc, result);
	}

	{
		std::ifstream stream("weekly-utf-16.xml");
		pugi::xml_parse_result result = doc.load(stream);

		// first character of root name: U+9031, year: 1997
		print_doc("UTF16 file from narrow stream", doc, result);
	}

	{
		// Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-8 file from a wide stream
		// directly if you have localized characters; you'll have to provide a UTF8 locale (there is no
		// standard one; you can use utf8_codecvt_facet from Boost (WHAT?))
		std::wifstream stream("weekly-utf-8.xml");
		pugi::xml_parse_result result = doc.load(stream);

		// first character of root name: U+00E9, year: 1997
		print_doc("UTF8 file from wide stream", doc, result);
	}

	{
		// Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-16 file from a wide stream
		// at all; you'll have to provide a UTF16 locale (WHAT??)
		std::wifstream stream("weekly-utf-16.xml");
		pugi::xml_parse_result result = doc.load(stream);

		// first character of root name: U+0000, year:
		print_doc("UTF16 file from wide stream", doc, result);
	}

	{
		// Since encoding names are non-standard, you can't load the Shift-JIS (or any other non-ASCII) file
		// from a wide stream portably; this code assumes Microsoft C Runtime Libraries (WHAT???)
		std::wifstream stream("weekly-shift_jis.xml");
		stream.imbue(std::locale(".932"));
		pugi::xml_parse_result result = doc.load(stream);

		// first character of root name: U+9031, year: 1997
		print_doc("Shift-JIS file from wide stream", doc, result);
	}
}