#include <string>

std::string ws2s(const std::wstring& ws)

{

    std::string curLocale = setlocale(LC_ALL, NULL);        // curLocale = "C";

    setlocale(LC_ALL, "chs");

    const wchar_t* _Source = ws.c_str();

    size_t _Dsize =  * ws.size() + ;

    char *_Dest = new char[_Dsize];

    memset(_Dest,,_Dsize);

    wcstombs(_Dest,_Source,_Dsize);

    std::string result = _Dest;

    delete []_Dest;

    setlocale(LC_ALL, curLocale.c_str());

    return result;

}

std::wstring s2ws(const std::string& s)

{

    setlocale(LC_ALL, "chs");

    const char* _Source = s.c_str();

    size_t _Dsize = s.size() + ;

    wchar_t *_Dest = new wchar_t[_Dsize];

    wmemset(_Dest, , _Dsize);

    mbstowcs(_Dest,_Source,_Dsize);

    std::wstring result = _Dest;

    delete []_Dest;

    setlocale(LC_ALL, "C");

    return result;

}

//c++ string 和wstring 之间的互相转换函数:

string a = "xxxx";

wstring b(a.begin(), a.end());