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FTP resuming

Posted on 1998-06-26
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Last Modified: 2013-12-03
in my application, i need to be able to have the ftp portion of it resume downloads if the connetion is broken.  it's currently an mfc app, but any help i can get will work.  mfc's CFtpConnection does not support this and i can't find any api function to do the trick. can someone lead me to the right answer?
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Question by:rabbitears
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4 Comments
 

Author Comment

by:rabbitears
ID: 1408791
also, FtpGetFile and CFtpConnection's counterpart both support a cache, but if the cache is deleted..........
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Expert Comment

by:MikeP090797
ID: 1408792
I don't know if it can be implemented in CFtpConnection, but the FTP protocol has a REST command.
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Author Comment

by:rabbitears
ID: 1408793
so i'm going to have to work with some kind of "pure" ftp connection and send the actual commands to the server?  how do i build that kind of connection IF i can't do it they way i'm trying..
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Accepted Solution

by:
WxW earned 100 total points
ID: 1408794
If you cannot find a function like REST , you should get the FTP socket from the CFTPConnection ( the class should have a member function to return you the socket ) , then pass the REST command manually using send() , and then attempt to download You should know how to use rest ( REST <size> )

There is a very important problem you might have : Some FTP servers recognize the REST command ONLY IF YOU SEND IT EXCACTLY BEFORE THE RETR command .

Usually FTP clients send first TYPE , PORT and RETR command . If CFtpConnection does not allow you to pass something before the RETR command , passing REST before the TYPE command , does not guarantee that the server will actually restart . It is server-depended .


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