Hi all,Thanks for all the advice about how to make my pipe reads non- blocking, that works almost perfectly. I have a class now that handles the notifications (called msgTarget in the code snippet below). The puzzle here is the meaning of "waitUntilExit". My hdiutil info task was returning no data in both the output and error file handles. When I put in sleep(1), I started to get error strings, but no output strings. When I increased the wait to sleep(3), my standard output started coming through. Why would this be the case if waitUntilExit is actually waiting until the hdiutil task completes and exits? Is there some other latency in this process that my sleep() accounts for? I'd rather not rely on a kludge like this to get my output string. Is the problem using readToEndOfFileInBackgroundAndNotify instead of readInBackgroundAndNotify? I tried the latter call, but seem to get better results using readToEndOfFileInBackgroundAndNotify (or is that totally the wrong thing to do?).
[task
setLaunchPath:@"/usr/bin/hdiutil"];
[task setArguments:[NSArray
arrayWithObjects:@"info", nil]];
[task
setStandardError:messagePipeError];
[task
setStandardOutput:messagePipeOutput];
NSFileHandle* readHandleError = [messagePipeError
fileHandleForReading];
[msgTarget
setReadHandleError:readHandleError];
NSFileHandle* readHandleOutput = [messagePipeOutput
fileHandleForReading];
[msgTarget
setReadHandleOutput:readHandleOutput];
[readHandleError
readToEndOfFileInBackgroundAndNotify];
[readHandleOutput
readToEndOfFileInBackgroundAndNotify];
[task launch];
sleep(3);
[task waitUntilExit];
status = [task terminationStatus];
Thanks for your help,
Michael
Michael Domino
[email protected]
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