Chris Gardner wrote:
Firstly, I will close the CFReadStream with CFReadStreamClose.
Secondly, I will use a new CFReadStream, and perform all the same
setup as I did before
to download the same file, meanwhile I am using
kCFStreamPropertyFTPFileTransferOffset to
offset the length of file data that I have downloaded.
You should have included that in your earlier description. It would
have saved some time.
At this point it's not clear whether the CFReadStream functions doing
the right thing or not.
Christian Weykopf's link to:
http://lists.apple.com/archives/macnetworkprog/2009/Jan/msg00010.html
may or may not be relevant, because that post uses NSURLConnection.
I suggest treating the CFReadStream and all its related CF functions
as a black box, and looking directly at its inputs and outputs on the
network. That is, use a tool like Interarchy to watch network
traffic as you run your code, then compare to what the FTP RFC says
it should be doing. Tell Interarchy to watch all traffic on the
active network interface, including TCP protocol packets, as those
will show you important details of when and how connections are made.
You will need some understanding of the FTP protocol, and you will
need to know some details of how TCP/IP works.
The goal is to figure out exactly what CFReadStream is doing to
establish or restart the FTP connection. If it does the wrong thing
with the TCP connections or the FTP protocol, then you are probably
wasting your time trying to figure out how to make it work correctly.
Finally, your question is fundamentally a networking question, not a
Cocoa question. You might get better advice by asking on a list
where this is on-topic, such as macnetworkprog. CFReadStream isn't
Cocoa, and even if it were, there's likely a greater concentration of
network expertise on macnetworkprog than there is here.
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