使用wininetAPI下载internet文件的源码

 

 

分类： vcbcbdelphi的window编程 2008-05-16 16:45307人阅读 评论(0)收藏 举报

//#include <windows.h>
#include <afxinet.h>
#include <stdio.h>
#include <WinInet.h>

#pragma comment(lib,"Wininet")
int GetInternetFile(char *szFileUrl,char *szFileName);

int InternetGetFile(char *szFileUrl,char *szFileName);

int main(int argc,char **argv)
{

 DWORD dwTimeBegin = GetTickCount();
 InternetGetFile(argv[1],argv[2]);
// GetInternetFile(argv[1],argv[2]);
 printf("use time %u ms/n",GetTickCount()-dwTimeBegin);
 return 0;
}

int GetInternetFile(char *szFileUrl,char *szFileName)
{
 CInternetSession mySessin("test");
 mySessin.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT,30);
 CHttpFile *pHttpFile=NULL;
 char szData[10*1024];
 pHttpFile = (CHttpFile *)mySessin.OpenURL(szFileUrl);

 DWORD dwBytesToRead=0;
 DWORD dwBytesLeft=0;
 DWORD dwBytesRead = 0;
 DWORD dwBufLen=sizeof(DWORD);
 if( !(pHttpFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH|HTTP_QUERY_FLAG_NUMBER,
  &dwBytesToRead,&dwBufLen)) )
 {
  printf("query length failed:%d/n",GetLastError());
  pHttpFile->Close();
  mySessin.Close();
  return -1;
 }
 printf("the internetfile length=%u bytes/n",dwBytesToRead);

 FILE *fp=NULL;
 fp = fopen(szFileName,"w");
 if(!fp)
 {
  printf("create file %s failed/n",szFileName);
  pHttpFile->Close();
  mySessin.Close();
  return -1;
 }

 dwBytesLeft = dwBytesToRead;
 while( dwBytesLeft!=0 ){
  dwBytesRead = pHttpFile->Read(szData,dwBytesLeft);
  if( dwBytesRead==0 )
   break;
  else
  {
   fwrite(szData,1,dwBytesRead,fp);
  }
  dwBytesLeft = dwBytesToRead - dwBytesRead;
 }
 fclose(fp);
 pHttpFile->Close();
 mySessin.Close();

 printf("download file success/n");
 return 0;
}

int InternetGetFile(char *szFileUrl,char *szFileName)
{
/*
 //获取Internet连接状态
 DWORD dwFlags=0;
 if( !InternetGetConnectedState(&dwFlags,0) )
 {
  printf("InternetGetConnectedState() failed:%d/n",GetLastError());
  return -1;
 }

 char strAgent[64]={0};
 sprintf(strAgent,"Agent%ld",GetTickCount());

 //打开Internet连接
 HINTERNET hOpen=NULL;
 if( !(dwFlags & INTERNET_CONNECTION_PROXY))
 {
  hOpen = InternetOpen(strAgent,INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY,
   NULL,NULL,0);
 }
 else
 {
  hOpen = InternetOpen(strAgent,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
 }
*/

 HINTERNET hOpen=NULL;
 hOpen = InternetOpen("myAgent",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
 if(!hOpen)
 {
  printf("Internet connect error:%d/n",GetLastError());
  return -1;
 }

 DWORD dwTimeOut = 1;
 if( !InternetSetOption(hOpen,INTERNET_OPTION_CONNECT_TIMEOUT,&dwTimeOut,sizeof(dwTimeOut)) )
 {
  printf("set timeout failed:%d/n",GetLastError());
  InternetCloseHandle(hOpen);
  return -1;
 }
/*
 DWORD dwValue=0;
 DWORD dwBufLen=sizeof(dwValue);
 if(!InternetQueryOption(hOpen,INTERNET_OPTION_CONNECT_TIMEOUT,&dwValue,&dwBufLen))
 {
  printf("InternetQueryOption failed:%d/n",GetLastError());
  InternetCloseHandle(hOpen);
  return -1;
 }
 printf("query option result, dwValue = %u,dwBufLen=%u/n",dwValue,dwBufLen);

*/
 char szHead[] = "Accept:*/*/r/n/r/n";
 char  szTemp[1024];
 HINTERNET hConnect=NULL;

 //打开Internet文件的URL
 if( !( hConnect = InternetOpenUrl(hOpen,szFileUrl,NULL,0,
  INTERNET_FLAG_DONT_CACHE|INTERNET_FLAG_NO_AUTH|INTERNET_FLAG_NO_COOKIES
  ,0) ) )
 {
  printf("Invalid url/n");
  InternetCloseHandle(hOpen);
  return -1;
 }

 FILE *fp=NULL;
 fp = fopen(szFileName,"w");
 if(!fp)
 {
  printf("create file %s failed/n",szFileName);
  InternetCloseHandle(hOpen);
  return -1;
 }

 DWORD dwBytesToRead =0;
 DWORD dwSizeOfRq = sizeof(dwBytesToRead);
 DWORD dwIndex=0;

 //查询Internet文件的长度信息
 if( !( HttpQueryInfo(hConnect,HTTP_QUERY_CONTENT_LENGTH|HTTP_QUERY_FLAG_NUMBER,
  (LPVOID)&dwBytesToRead,&dwSizeOfRq,&dwIndex) ) )
 {
  printf("HttpQueryInfo failed:%d/n",GetLastError());
  dwBytesToRead = 0;
  fclose(fp);
  InternetCloseHandle(hOpen);
  return -1;
 }
 printf("Avaliable data:%u bytes/n",dwBytesToRead);
 
 DWORD dwReadBytes=0;
 do
 {
  //读取文件数据
  if( !InternetReadFile(hConnect,szTemp,1024,&dwReadBytes) )
  {
   printf("read file error:%d/n",GetLastError());
   fclose(fp);
   InternetCloseHandle(hOpen);
   return -1;
  }

  //下载完毕
  if(dwReadBytes==0)
   break;
  else
   fwrite(szTemp,dwReadBytes,1,fp);
  
  if( (dwBytesToRead -= dwReadBytes)==0 ) break;

 }while( TRUE);
 
 fclose(fp);
 InternetCloseHandle(hOpen);
 printf("download file success/n");
 return 0;
 
}