C++ POST方式访问网页

bool PostContent(CString strUrl, const CString &strPara, CString &strContent, CString &strDescript)//第一个参数为URL头
{                         //第二个参数为要post表单的内容
    try{                       //第三个参数用于保存页面返回的信息
                         //第四个参数用于记录日志
        strDescript = "提交成功完成！";
        bool bRet = false;
        CString strServer, strObject, strHeader, strRet;
        unsigned short nPort;
        DWORD dwServiceType;
        if(!AfxParseURL www.90168.org (strUrl, dwServiceType, strServer, strObject, nPort))
        {
            strDescript = strUrl + "不是有效有网络地址！";
            return false;
        }
        CInternetSession sess;//Create session

CHttpFile* pFile;
        //////////////////////////////////////////////
        CHttpConnection *pServer = sess.GetHttpConnection(strServer, nPort);
        if(pServer == NULL)
        {
            strDescript = "对不起，连接服务器失败！";
            return false;
        }
        pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_POST,strObject,NULL,1,NULL,NULL,INTERNET_FLAG_EXISTING_CONNECT);
        if(pFile == NULL)
        {
            strDescript = "找不到网络地址" + strUrl;
            return false;
        }

pFile -> AddRequestHeaders("Content-Type: application/x-www-form-urlencoded");
        pFile -> AddRequestHeaders("Accept: */*");
        pFile -> SendRequest(NULL, 0, (LPTSTR)(LPCTSTR)strPara, strPara.GetLength());

CString strSentence;
        DWORD dwStatus;
        DWORD dwBuffLen = sizeof(dwStatus);
        BOOL bSuccess = pFile->QueryInfo(
            HTTP_QUERY_STATUS_CODE|HTTP_QUERY_FLAG_NUMBER,
            &dwStatus, &dwBuffLen);

if( bSuccess && dwStatus>=  200 && dwStatus<300)
        {
            char buffer[256];
            memset(buffer, 0, 256);
            int nReadCount = 0;
            while((nReadCount = pFile->Read(buffer, 2048)) > 0)
            {
                strContent += buffer;
                memset(buffer, 0, 256);
            }
            bRet = true;
        }
        else
        {
            strDescript = "网站服务器错误" + strUrl;
            bRet = false;
        }
        ////////////////////////////////////////
        pFile->Close();
        sess.Close();
        return bRet;
    }
    catch(...)
    {
        int nCode = GetLastError();
        strDescript.Format("向服务器post失败！错误号：%d", nCode);
        return false;
    }
}