Re: NSStream or when NSStreamEventEndEncountered appears too late
Re: NSStream or when NSStreamEventEndEncountered appears too late
- Subject: Re: NSStream or when NSStreamEventEndEncountered appears too late
- From: Andrew Farmer <email@hidden>
- Date: Wed, 21 Nov 2007 14:57:27 -0800
On 21 Nov 07, at 14:44, Kubernan At 10191 Technologies wrote:
I'm studying the NSStream class and its concrete subclasses.
For that i wrote a very simple NNTP (usenet) client app.
In this application i use the run-loop scheduling streams technique.
I'm able to catch all stream events but NSStreamEventEndEncountered
appears about 4 minutes after reading the last NNTP response (i.e.
the end of the input stream) :
If i send the "LIST" command (give me the list of the newsgroups) to
the NNTP server, i receive the response via several
NSStreamEventHasBytesAvailable events. In the NNTP protocol the end
of a response for such a command is @".\r\n" sequence. I have this
sequence in an ultimate NSStreamEventHasBytesAvailable event.
For me it means the end of the input stream, but the
NSStreamEventEndEncountered event comes 4 minutes after... and there
is no other event between the end of the response and the end event.
The apple doc says "....When an NSInputStream object reaches the end
of a stream, it sends the delegate a NSStreamEventEndEncountered
event...". Maybe i didn't well understand what "end of a stream"
really means.
Do you have an idea why i receive the NSStreamEventEndEncountered
event so long after the last NSStreamEventHasBytesAvailable ?
"End of a stream" means the connection has closed down completely -
this is apparently only happening after the server times out. There's
no application-independent way to detect the end of an individual
transmission on a TCP stream; you'll need to detect the end-of-listing
marker yourself and respond to it yourself.
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