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, 0, str, -1, NULL, 0);
     strSrc = new WCHAR[i+1];
     MultiByteToWideChar(CP_ACP, 0, str, -1, strSrc, i);

     //获得临时变量的大小
     i = WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, NULL, 0, NULL, NULL);
     szRes = new TCHAR[i+1];
     int j=WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, 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, 0, str, -1, NULL, 0);
     strSrc = new WCHAR[i+1];
     MultiByteToWideChar(CP_UTF8, 0, str, -1, strSrc, i);

     //获得临时变量的大小
     i = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
     szRes = new TCHAR[i+1];
     WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, i, NULL, NULL);

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

     return des;
}