C++中wstring与string相互转化

//wstring转string
std::wstring s2ws(const std::string& s)  
{  
    setlocale(LC_ALL, "chs");   
    const char* _Source = s.c_str();  
    size_t _Dsize = s.size() + 1;  
    wchar_t *_Dest = new wchar_t[_Dsize];  
    wmemset(_Dest, 0, _Dsize);  
    mbstowcs(_Dest,_Source,_Dsize);  
    std::wstring result = _Dest;  
    delete []_Dest;  
    setlocale(LC_ALL, "C");  
    return result;  
}
//string转wstring
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 = 2 * ws.size() + 1;  
    char *_Dest = new char[_Dsize];  
    memset(_Dest,0,_Dsize);  
    wcstombs(_Dest,_Source,_Dsize);  
    std::string result = _Dest;  
    delete []_Dest;  
    setlocale(LC_ALL, curLocale.c_str());  
    return result;  
}