On Mar 28, 2010, at 2:29 PM, Ken Thomases wrote: > On Mar 28, 2010, at 1:56 PM, James W. Walker wrote: > >> I've been running NSTask and reading the output using -[NSFileHandle >> readInBackgroundAndNotify], but in certain situations there was a problem: >> Due to the block buffering of standard output, I wasn't getting notified as >> soon as some output had been produced. I don't have control over the code >> being run by NSTask. Some googling led me to believe that I need to use a >> pseudo tty instead of NSPipe to communicate with the NSTask. So, I called >> openpty, wrapped the file descriptors in NSFileHandles, set the slave handle >> as standard output of the NSTask, and called [masterHandle >> readInBackgroundAndNotify]. This almost worked. The problem is that I >> can't tell when the output is done. When I was using NSPipe, my >> NSFileHandleReadCompletionNotification observer method would get an NSData >> of length 0, which told me that there was no more data. Now, that doesn't >> happen. I tried observing NSTaskDidTerminateNotification, but that >> notification arrives before I've received all the data. Attempting to read >> more data with -[NSFileHandle availableData] just hangs. >> >> Can anyone lead me out of this mire? > > After launching the task, is the parent closing the slave fd? I think it > should and, if it does, the stream will get EOF (data of length 0) after the > task terminates. (Although the ordering of the > NSFileHandleReadCompletionNotification and NSTaskDidTerminateNotification > notifications is arbitrary.)
I'll be darned, closing the slave descriptor after launching the task did the trick. Now that I'm getting all the read notifications, I don't care about NSTaskDidTerminateNotification, so I'm in business. Thank you very much. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
