c++ - Writing Unicode string to XML with Boost Property Tree -

#include <boost/property_tree/ptree.hpp> #include <boost/property_tree/xml_parser.hpp> #include <string>  using namespace std;  int main() {     wstring s(l"alex");      boost::property_tree::wptree maintree;     boost::property_tree::wptree datatree;      datatree.put(l"name", s);     maintree.add_child(l"data", datatree);     boost::property_tree::xml_writer_settings<wchar_t> w(l' ', 3);      try     {         write_xml("data.xml", maintree, std::locale(), w);     }     catch(boost::property_tree::xml_parser_error& error)     {         cout << error.message().c_str() << endl;         return 1;     }      cout << "ok" << endl;     return 0; } 

this program prints ok , writes xml file expected:

<?xml version="1.0" encoding="utf-8"?> <data>    <name>alex</name> </data> 

now replace s value non-ascii characters:

    //wstring s(l"alex");    wstring s(l"Алекс"); 

when program executed, prints: write error, , xml file looks this:

<?xml version="1.0" encoding="utf-8"?> <data>    <name> 

how can fix this? need write non-ascii data xml file, using boost property tree.

i think shouldn't use std::locale() utf8 locale. in boost-1.51, can use boost/detail/utf8_codecvt_facet.ipp make utf8 locale.

first, include utf8_codecvt_facet.ipp this:

#define boost_utf8_begin_namespace \ namespace boost { namespace detail { #define boost_utf8_decl #define boost_utf8_end_namespace }} #include <boost/detail/utf8_codecvt_facet.ipp> #undef boost_utf8_end_namespace #undef boost_utf8_decl #undef boost_utf8_begin_namespace 

and then, make utf8 locale , write xml locale.

std::locale utf8_locale(std::locale(), new boost::detail::utf8_codecvt_facet); write_xml("data.xml", maintree, utf8_locale, w); 

it works fine in environment.