MFC HTTP GET 请求

//HTTP GET 下载文件
	CInternetSession *pInetSession = new CInternetSession(AfxGetAppName(),1,PRE_CONFIG_INTERNET_ACCESS);
	CHttpConnection	*pHttpConn = NULL;
	CHttpFile *pHttpFile = NULL;
	CString strUrl;
	DWORD dwServiceType;
	CString strServer, strObj, strUser, strPwd;
	INTERNET_PORT nPort;

	strUrl = "http://www.tdx.com.cn/products/data/data/dbf/base.zip";
	if (!AfxParseURLEx(strUrl, dwServiceType, strServer, strObj, nPort, strUser, strPwd, ICU_NO_ENCODE))
	{
		MessageBox("下载地址有误！...");
		return;
	}
	if (!pHttpConn)
	{
		pHttpConn = pInetSession->GetHttpConnection(strServer, INTERNET_INVALID_PORT_NUMBER, "ELIMINATOR77","PANZER76");
	}
	int nVal = 6000;
	pInetSession->SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, &nVal, sizeof(nVal));
	pHttpFile = pHttpConn->OpenRequest("GET",strObj);
	try
	{
		MessageBox(_T("正在连接到网站..."));
		pHttpFile->SendRequest();
	}
	catch (CInternetException *pEx)
	{
		MessageBox("下载出错...");
		pEx->Delete();
		delete pHttpFile;
		return;
	}
	DWORD dwRet;
	pHttpFile->QueryInfoStatusCode(dwRet);
	if (dwRet != HTTP_STATUS_OK)
	{
		CString error;
		error.Format("出错了，错误码：%d",dwRet);
		AfxMessageBox(error);
		return;
	}
	char szPath[100]={0};
	GetCurrentDirectory(sizeof(szPath),szPath);
	CString HomePath;
	HomePath = szPath;
	int p1 = HomePath.ReverseFind('/');
	int p2 = HomePath.ReverseFind('\\');
	int pos = max(p1,p2);
	if (pos > 0)
	{
		HomePath = HomePath.Left(pos+1);
	}
	CString filePath;
	filePath.Format("%s%s",HomePath,"base.zip");
	//TCHAR* pszFileName = _T("Open_File.dat");
	CFile tempFile;
	CFileException fe;
	//CFile tempFile(filePath, CFile::modeCreate|CFile::modeWrite);
	if (!tempFile.Open(filePath, CFile::modeCreate|CFile::modeWrite, &fe))
	{
		DWORD erno = GetLastError();
		CString error;
		TCHAR szErr[512]={0};
		fe.GetErrorMessage(szErr,sizeof(szErr));
		error.Format("不能将下载文件存盘:%s",szErr);
		AfxMessageBox(error);
		//return;
	}
	int numread = 0;
	char buf[512]={0};
	while ((numread=pHttpFile->Read(buf,sizeof(buf)-1)) > 0)
	{
		tempFile.Write(buf,numread);
	}
	tempFile.Close();
	pInetSession->Close();
	delete pInetSession;
	pHttpFile->Close();
	delete pHttpFile;