FtpWebRequest not continuing after failed connection

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+2 Q:

FtpWebRequest not continuing after failed connection

I am doing a project on FTP file-transfer using FtpWebRequest class. While transferring the file, if my network connection gets disconnected the file in the receiving end gets hanged. I am not able to process further even though I re-establish my network connection. After some time the file gets removed; then I am able to put the file again. What is the problem? Is the class is designed in that manner?

Receiving End Means - the machine in which the ftp server runs,and im the who sends the file from a machine without FTP.

+1 A:

What FTP server you are programming against? I think it is the server who prevents you from manipulating that file (which should be in unknown state) after building up a new connection.

Also when the network connection is disconnected, the underlying WinSock call is still expecting a response from the FTP server. So it hangs there. So if I were you, I will consider async calls, where I can cancel the call if it times out.

Lex Li 2009-10-30 08:42:41

hishall i go for asynchronous ftp transfer

karthik 2009-10-31 05:46:24

That depends on your application and your choice. Synchronous is easier to use/develop, but asynchronous gives you more flexibilities.

Lex Li 2009-10-31 11:35:26

will you give me links to work out,bcoz i have no idea.i have l lotof doubts over it,how to cancel a asyncronous calls,how to time out a connection etc

karthik 2009-11-03 05:14:48

You can use BeginGetResponse to send out the request and wait for a response, and check if the response has been received using IAsyncResult.IsCompleted.This MSDN page has a sample similiar,http://msdn.microsoft.com/en-us/library/system.net.ftpwebrequest.abort(VS.80).aspx

Lex Li 2009-11-05 03:58:25

ansaurus

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