从网站上读取数据的方法

1.把文件下到本地

STDAPI URLDownloadToFileA(LPUNKNOWN,LPCSTR,LPCSTR,DWORD,LPBINDSTATUSCALLBACK);                            
STDAPI URLDownloadToFileW(LPUNKNOWN,LPCWSTR,LPCWSTR,DWORD,LPBINDSTATUSCALLBACK);                          
strIniURL= web

 m_strIniTemp = m_strAppPath + _T("temp//update.ini");

 if ( URLDownloadToFile( NULL, m_strIniURL, m_strIniTemp,0, NULL ) == S_OK )
{//直接下文件} 

2.把文件全部读出

CString CVDialerDlg::URLDownloadA(CString pHttp,CString strObjName)
{
 CString strRet = "Error";
 CInternetSession m_cis;
 CHttpConnection *m_pHttp;
 DWORD m_dwHttpRequestFlags;
 INTERNET_PORT m_dwPort=80;
 
 m_dwHttpRequestFlags=HSR_DOWNLOAD | INTERNET_FLAG_EXISTING_CONNECT | INTERNET_FLAG_NO_AUTO_REDIRECT;
 //
 m_cis.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT,3000); 
 m_pHttp=m_cis.GetHttpConnection(pHttp,m_dwPort);
 //
 //
 CHttpFile *pFile = m_pHttp->OpenRequest(CHttpConnection::HTTP_VERB_GET,
  strObjName, NULL, 1, NULL, NULL, m_dwHttpRequestFlags);
 try
 {
  pFile->SendRequest();
 }
 catch (...)
 {
  return strRet;
 }
 
 //
 if(pFile)
 {
  char bufHttp[256]={0};
  pFile->Read(bufHttp,256);
  
  CString strMsg;
  strMsg.Format("%s",bufHttp);
  int nlen = strMsg.Find("UPDATEURL");
  strMsg = strMsg.Left(nlen-2);//换行
  nlen = strMsg.Find("VERSION=") +8;
  nlen = strMsg.GetLength() - nlen;
  strMsg= strMsg.Right(nlen);
  strRet = strMsg ;
 }
 
 return strRet;
}
3.打开文件，逐行读出

CInternetSession mySession(NULL,0);
 CHttpFile* myHttpFile=NULL;
 
 CString myData;
 CString myUrl;
 CString m_SiteInfo;
 myUrl = " http://www.mmm.com/mmm/update/test1/update.ini";
 myHttpFile=(CHttpFile*)mySession.OpenURL(myUrl);
 while(myHttpFile->ReadString(myData))
 {
  m_SiteInfo = myData;
  AfxMessageBox( m_SiteInfo );
 } 

 
 myHttpFile->Close();
 mySession.Close();