Windows 下关于转码的函数

 std::string& MsgFieldList::GBToUTF8(std::string& des,const char* str)
 {
      WCHAR *strSrc;
      TCHAR *szRes;

      //获得临时变量的大小
      int i = MultiByteToWideChar(CP_ACP, , str, -, NULL, );
      strSrc = new WCHAR[i+];
      MultiByteToWideChar(CP_ACP, , str, -, strSrc, i);

      //获得临时变量的大小
      i = WideCharToMultiByte(CP_UTF8, , strSrc, -, NULL, , NULL, NULL);
      szRes = new TCHAR[i+];
      int j=WideCharToMultiByte(CP_UTF8, , strSrc, -, szRes, i, NULL, NULL);

      des = szRes;
      delete []strSrc;
      delete []szRes;

      return des;
 }

反转代码：

 std::string& MsgFieldList::UTF8ToGB(std::string& des,const char* str)
 {
      WCHAR *strSrc;
      TCHAR *szRes;

      //获得临时变量的大小
      int i = MultiByteToWideChar(CP_UTF8, , str, -, NULL, );
      strSrc = new WCHAR[i+];
      MultiByteToWideChar(CP_UTF8, , str, -, strSrc, i);

      //获得临时变量的大小
      i = WideCharToMultiByte(CP_ACP, , strSrc, -, NULL, , NULL, NULL);
      szRes = new TCHAR[i+];
      WideCharToMultiByte(CP_ACP, , strSrc, -, szRes, i, NULL, NULL);

      des = szRes;
      delete []strSrc;
      delete []szRes;

      return des;
 }