UTF8转化为GB的可重用函数

CString UTF8ToGB(std::string* sstr)
{
     CString result;
     WCHAR *strSrc;
     TCHAR *szRes;
     const char* str = sstr->c_str();

     //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);

     result = szRes;
     delete []strSrc;
     delete []szRes;

     return result;
}

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