win32 wstring <-> string

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static std::string w2c(std::wstring str)     {         int nlength = str.length();         int nbytes = WideCharToMultiByte(0,0,str.c_str(),nlength,NULL,0,NULL,NULL);         if(nbytes == 0) return "";           char*buff = new char[nbytes+1];         WideCharToMultiByte(0,0,str.c_str(),nlength,buff,nbytes,NULL,NULL);         buff[nbytes] = '\0';         std::string ret_str = std::string(buff);         delete [] buff;         return ret_str;         }   static std::wstring c2w(std::string str)     {         if(str.length() == 0) return std::wstring();           int nu = str.length();         size_t n =(size_t)MultiByteToWideChar(CP_ACP,0,str.c_str(),nu,NULL,0);         wchar_t*wbuff = new wchar_t[n+1];         MultiByteToWideChar(CP_ACP,0,str.c_str(),(int)nu,wbuff,(int)n);         wbuff[n] = 0;           std::wstring wstr_ret = std::wstring(wbuff);         delete []wbuff;         return wstr_ret;     }

 【转】https://my.oschina.net/lyr/blog/375799