readInBackgroundAndNotifyForModes problems...
readInBackgroundAndNotifyForModes problems...
- Subject: readInBackgroundAndNotifyForModes problems...
- From: Alec Carlson <email@hidden>
- Date: Sat, 06 Apr 2002 17:18:33 -0600
I'm using NSFileHandle:readInBackgroundAndNotifyForModes to read TCP packets
in the background. The NSFileHandle was created by taking a socket ID
returned from socket() and then calling NSFileHandle:initWithFileDescriptor
to create an NSFileHandle out of the socket ID. I then call connect() to
connect to a remote server and then
NSFileHandle:readInBackgroundAndNotifyForModes to have NSFileHandle read
packets in the background and call my observer when a packet arrives.
The problem is that my observer sometimes gets called with stale data. At
time X, my observer gets called with packet data A. At time X+1, my observer
gets called again with packet data A. It should contain packet data B. I
know that I don't receive the data on packet boundaries. That's not the
issue. The problem is I receive the same data twice. It looks like I'm
getting the same NSData object in successive
NSFileHandleReadCompletionNotification calls.
Is there anything special I have to do in my observer with the NSData object
passed in for a NSFileHandleReadCompletionNotification callback ? Any
thoughts on what's going on here ? Does this work for anyone else ?
Thanx -
Alec Carlson
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