ftp连接时用internetconnect()如何设置超时,连接非ftp站点速度非常慢

Question

一个ftp文件传输程序,用internetconnect()连接ftp站点,如果连接的ip地址不提供ftp服务,则用internetconnect()连接速度超慢.请教如何设置超时时间,我用internetsetoption(hopen,INTERNET_OPTION_CONNECT_TIMEOUT,@tmpTimeOut,sizeof(tmpTimeOut));
为什么没有效果!
程序段如下:var
  tmpTimeOut:dword;
begin
  hopen:=internetopen(pchar('hello'),0,NIL,NIL,0);
  tmpTimeOut:=10;
  aa:=internetsetoption(hopen,INTERNET_OPTION_CONNECT_TIMEOUT,@tmpTimeOut,sizeof(tmpTimeOut));
          hconnection:=internetconnect(hopen,pchar(172.18.26.235),21,'Anonymous','User@',internet_service_ftp,0,255);

Answer 1

msdn 上说了，ftp设超时没有用。
上面还有个示例程序，介绍如何用两个线程的方法自己控制超时。

Answer 2

msdn 上面的解释,没有说ftp设超时没有用。高人帮忙,问题依旧
INTERNET_OPTION_CONNECT_TIMEOUT 
Sets or retrieves an unsigned long integer value that contains the time-out value to use for Internet connection requests. Units are in milliseconds. If a connection request takes longer than this time-out value, the request is canceled. When attempting to connect to multiple IP addresses for a single host (a multihome host), the timeout limit is cumulative for all of the IP addresses. This option can be used on any HINTERNET handle, including a NULL handle. It is used by InternetQueryOption and InternetSetOption.

Answer 3

看来不写清楚真不行啊：http://support.microsoft.com/default.aspx?scid=kb;en-us;176420
http://support.microsoft.com/kb/224318/EN-US/

Answer 4

谁给把这段代码翻译成delphi先,我底子差
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   
  
   #include <wininet.h>
   #include <iostream.h>   DWORD WINAPI WorkerFunction( LPVOID );
   HINTERNET g_hOpen, g_hConnect;   typedef struct
   {
       CHAR* pHost;
       CHAR* pUser;
       CHAR* pPass;
   } PARM;   void main()
   {
       CHAR    szHost[] = "localhost";
       CHAR    szUser[] = "JoeB";
       CHAR    szPass[] = "test";
       CHAR    szLocalFile[] = "localfile";
       CHAR    szRemoteFile[] = "remotefile";
       DWORD   dwExitCode;
       DWORD   dwTimeout;
       PARM    threadParm;       g_hOpen = 0;
       if ( !( g_hOpen = InternetOpen ( "FTP sample",
                                        LOCAL_INTERNET_ACCESS,
                                        NULL,
                                        0,
                                        0 ) ) )
       {
           cerr << "Error on InternetOpen: " << GetLastError() << endl;
           return ;
       }       // Create a worker thread
       HANDLE   hThread;
       DWORD    dwThreadID;
       threadParm.pHost = szHost;
       threadParm.pUser = szUser;
       threadParm.pPass = szPass;       hThread = CreateThread(
                     NULL,            // Pointer to thread security attributes
                     0,               // Initial thread stack size, in bytes
                     WorkerFunction,  // Pointer to thread function
                     &threadParm,     // The argument for the new thread
                     0,               // Creation flags
                     &dwThreadID      // Pointer to returned thread identifier
                 );       // Wait for the call to InternetConnect in worker function to complete
       dwTimeout = 5000; // in milliseconds
       if ( WaitForSingleObject ( hThread, dwTimeout ) == WAIT_TIMEOUT )
       {
           cout << "Can not connect to server in "
                << dwTimeout << " milliseconds" << endl;
           if ( g_hOpen )
   InternetCloseHandle ( g_hOpen );
           // Wait until the worker thread exits
           WaitForSingleObject ( hThread, INFINITE );
           cout << "Thread has exited" << endl;
           return ;
       }       // The state of the specified object (thread) is signaled
       dwExitCode = 0;
       if ( !GetExitCodeThread( hThread, &dwExitCode ) )
       {
           cerr << "Error on GetExitCodeThread: " << GetLastError() << endl;
           return ;
       }       CloseHandle (hThread);
       if ( dwExitCode )
       // Worker function failed
          return ;       if ( !FtpGetFile ( g_hConnect,
                          szRemoteFile,
                          szLocalFile,
                          FALSE,INTERNET_FLAG_RELOAD,
                          FTP_TRANSFER_TYPE_ASCII,
                          0 ) )
       {
           cerr << "Error on FtpGetFile: " << GetLastError() << endl;
           return ;
       }       if ( g_hConnect )
           InternetCloseHandle( g_hConnect );
       if ( g_hOpen )
           InternetCloseHandle( g_hOpen );       return ;
   }   /////////////////// WorkerFunction //////////////////////
   DWORD WINAPI
   WorkerFunction(
       IN LPVOID vThreadParm
   )
   /*
   Purpose:
       Call InternetConnect to establish a FTP session
   Arguments:
       vThreadParm - points to PARM passed to thread
   Returns:
       returns 0
   */
   {
       PARM* pThreadParm;
       // Initialize local pointer to void pointer passed to thread
       pThreadParm = (PARM*)vThreadParm;
       g_hConnect = 0;       if ( !( g_hConnect = InternetConnect (
                                g_hOpen,
                                pThreadParm->pHost,
                                INTERNET_INVALID_PORT_NUMBER,
                                pThreadParm->pUser,
pThreadParm->pPass,
                                INTERNET_SERVICE_FTP,
                                0,
                                0 ) ) )
       {
           cerr << "Error on InternetConnnect: " << GetLastError() << endl;
           return 1; // failure
       }       return 0;  // success
   }

Answer 5

谁给把这段代码翻译成delphi先,我底子差
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   
  
   #include <wininet.h>
   #include <iostream.h>   DWORD WINAPI WorkerFunction( LPVOID );
   HINTERNET g_hOpen, g_hConnect;   typedef struct
   {
       CHAR* pHost;
       CHAR* pUser;
       CHAR* pPass;
   } PARM;   void main()
   {
       CHAR    szHost[] = "localhost";
       CHAR    szUser[] = "JoeB";
       CHAR    szPass[] = "test";
       CHAR    szLocalFile[] = "localfile";
       CHAR    szRemoteFile[] = "remotefile";
       DWORD   dwExitCode;
       DWORD   dwTimeout;
       PARM    threadParm;       g_hOpen = 0;
       if ( !( g_hOpen = InternetOpen ( "FTP sample",
                                        LOCAL_INTERNET_ACCESS,
                                        NULL,
                                        0,
                                        0 ) ) )
       {
           cerr << "Error on InternetOpen: " << GetLastError() << endl;
           return ;
       }       // Create a worker thread
       HANDLE   hThread;
       DWORD    dwThreadID;
       threadParm.pHost = szHost;
       threadParm.pUser = szUser;
       threadParm.pPass = szPass;       hThread = CreateThread(
                     NULL,            // Pointer to thread security attributes
                     0,               // Initial thread stack size, in bytes
                     WorkerFunction,  // Pointer to thread function
                     &threadParm,     // The argument for the new thread
                     0,               // Creation flags
                     &dwThreadID      // Pointer to returned thread identifier
                 );       // Wait for the call to InternetConnect in worker function to complete
       dwTimeout = 5000; // in milliseconds
       if ( WaitForSingleObject ( hThread, dwTimeout ) == WAIT_TIMEOUT )
       {
           cout << "Can not connect to server in "
                << dwTimeout << " milliseconds" << endl;
           if ( g_hOpen )
   InternetCloseHandle ( g_hOpen );
           // Wait until the worker thread exits
           WaitForSingleObject ( hThread, INFINITE );
           cout << "Thread has exited" << endl;
           return ;
       }       // The state of the specified object (thread) is signaled
       dwExitCode = 0;
       if ( !GetExitCodeThread( hThread, &dwExitCode ) )
       {
           cerr << "Error on GetExitCodeThread: " << GetLastError() << endl;
           return ;
       }       CloseHandle (hThread);
       if ( dwExitCode )
       // Worker function failed
          return ;       if ( !FtpGetFile ( g_hConnect,
                          szRemoteFile,
                          szLocalFile,
                          FALSE,INTERNET_FLAG_RELOAD,
                          FTP_TRANSFER_TYPE_ASCII,
                          0 ) )
       {
           cerr << "Error on FtpGetFile: " << GetLastError() << endl;
           return ;
       }       if ( g_hConnect )
           InternetCloseHandle( g_hConnect );
       if ( g_hOpen )
           InternetCloseHandle( g_hOpen );       return ;
   }   /////////////////// WorkerFunction //////////////////////
   DWORD WINAPI
   WorkerFunction(
       IN LPVOID vThreadParm
   )
   /*
   Purpose:
       Call InternetConnect to establish a FTP session
   Arguments:
       vThreadParm - points to PARM passed to thread
   Returns:
       returns 0
   */
   {
       PARM* pThreadParm;
       // Initialize local pointer to void pointer passed to thread
       pThreadParm = (PARM*)vThreadParm;
       g_hConnect = 0;       if ( !( g_hConnect = InternetConnect (
                                g_hOpen,
                                pThreadParm->pHost,
                                INTERNET_INVALID_PORT_NUMBER,
                                pThreadParm->pUser,
pThreadParm->pPass,
                                INTERNET_SERVICE_FTP,
                                0,
                                0 ) ) )
       {
           cerr << "Error on InternetConnnect: " << GetLastError() << endl;
           return 1; // failure
       }       return 0;  // success
   }