locale loc("chs");

        char narrow[] = "你好 hello";

        wchar_t wide_cpp[100];

        memset(wide_cpp, 0, sizeof(wide_cpp));

        (use_facet<ctype<wchar_t> >(loc)).widen(narrow,

        narrow + strlen(narrow), wide_cpp);

#include <locale>

#include <stdlib.h>

#include <stdio.h>

#include <clocale>

#include <iostream>

#include <string>

#include <sstream>



char             narrow[100];

wchar_t          word[100]; 

const char      *from = narrow;

const char      *nstart = narrow;

wchar_t         *to = 0;

wchar_t         *wstart = word;

mbstate_t         cs;

std::wstring     my_wstr;





int main( )

{

	std::locale::global(std::locale("")); 



	snprintf(narrow, 99, "%s", "12 测试 abc 你好");



      

	std::use_facet< std::codecvt<wchar_t, char,

                                     mbstate_t> >(std::locale("")).in(cs,

                      nstart,

                      nstart+strlen(narrow), 

                      from, 

                      wstart,

                      wstart+100,

                      to );



	my_wstr = word;



	std::wcout << L"word = " << word << std::endl;

	std::wcout << L"my_wstr = " << my_wstr << std::endl;



	std::wcout << L"wcslen word = "  << wcslen(word) << std::endl;

	

	return 0;

}