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FTPWebRequest

Archimedes2413-Nov-09 6:43

Archimedes24

13-Nov-09 6:43

Hi,

I have a small FTP class, written in VB.NET 2.0, which keeps polling for a particular file at a remote location, at 2 minute intervals, till it successfully downloads the file, and then it stops.

So far I had been using wget as an external process, and recently I have switched to using the FtpWebRequest class.

Now what i have noticed is that the first attempt always fails, even if the particular file is available on the remote server. The error returned is System.Net.WebException.

However, in the next run, after 2 minutes, the process succeeds, with exactly the same parameters.

The relevant part of the code:

Dim myFtpWebRequest As FtpWebRequest
       Dim myFtpWebResponse As FtpWebResponse
       Dim myStreamWriter As StreamWriter
       Dim strURL As String = ""

       strURL = "ftp://" & strFTPURL & strFTPFolder & strFileName

       myFtpWebRequest = DirectCast(WebRequest.Create(strURL), FtpWebRequest)
       myFtpWebRequest.KeepAlive = False
       myFtpWebRequest.Timeout = 20000
       myFtpWebRequest.UsePassive = blnUsePassive
       myFtpWebRequest.UseBinary = True


       myFtpWebRequest.Credentials = New NetworkCredential(strFTPUserName, strFTPPassword)
       myFtpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile
       myFtpWebResponse = myFtpWebRequest.GetResponse()

Can someone throw some light on this?

Regards
RB