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    <p>Here is an example of an async NSTask running a unix script. Within the Unix script there are <code>echo</code> commands that send back the current status to standard error like this: </p> <p><code>echo "working" &gt;&amp;2</code></p> <p>This is processed by notification center and sent to the display. </p> <p>To update a determinate progress bar just send status updates like "25.0" "26.0" and convert to float and send to the progress bar. </p> <p>note: I got this working after alot of experimenting and by using many tips from this site and other references. so I hope it is helpful to you.</p> <p>Here are the declarations: </p> <pre><code>NSTask *unixTask; NSPipe *unixStandardOutputPipe; NSPipe *unixStandardErrorPipe; NSPipe *unixStandardInputPipe; NSFileHandle *fhOutput; NSFileHandle *fhError; NSData *standardOutputData; NSData *standardErrorData; </code></pre> <p>Here are the main program modules:</p> <pre><code> - (IBAction)buttonLaunchProgram:(id)sender { [_unixTaskStdOutput setString:@"" ]; [_unixProgressUpdate setStringValue:@""]; [_unixProgressBar startAnimation:sender]; [self runCommand]; } - (void)runCommand { //setup system pipes and filehandles to process output data unixStandardOutputPipe = [[NSPipe alloc] init]; unixStandardErrorPipe = [[NSPipe alloc] init]; fhOutput = [unixStandardOutputPipe fileHandleForReading]; fhError = [unixStandardErrorPipe fileHandleForReading]; //setup notification alerts NSNotificationCenter *nc = [NSNotificationCenter defaultCenter]; [nc addObserver:self selector:@selector(notifiedForStdOutput:) name:NSFileHandleReadCompletionNotification object:fhOutput]; [nc addObserver:self selector:@selector(notifiedForStdError:) name:NSFileHandleReadCompletionNotification object:fhError]; [nc addObserver:self selector:@selector(notifiedForComplete:) name:NSTaskDidTerminateNotification object:unixTask]; NSMutableArray *commandLine = [NSMutableArray new]; [commandLine addObject:@"-c"]; [commandLine addObject:@"/usr/bin/kpu -ca"]; //put your script here unixTask = [[NSTask alloc] init]; [unixTask setLaunchPath:@"/bin/bash"]; [unixTask setArguments:commandLine]; [unixTask setStandardOutput:unixStandardOutputPipe]; [unixTask setStandardError:unixStandardErrorPipe]; [unixTask setStandardInput:[NSPipe pipe]]; [unixTask launch]; //note we are calling the file handle not the pipe [fhOutput readInBackgroundAndNotify]; [fhError readInBackgroundAndNotify]; } -(void) notifiedForStdOutput: (NSNotification *)notified { NSData * data = [[notified userInfo] valueForKey:NSFileHandleNotificationDataItem]; NSLog(@"standard data ready %ld bytes",data.length); if ([data length]){ NSString * outputString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSTextStorage *ts = [_unixTaskStdOutput textStorage]; [ts replaceCharactersInRange:NSMakeRange([ts length], 0) withString:outputString]; } if (unixTask != nil) { [fhOutput readInBackgroundAndNotify]; } } -(void) notifiedForStdError: (NSNotification *)notified { NSData * data = [[notified userInfo] valueForKey:NSFileHandleNotificationDataItem]; NSLog(@"standard error ready %ld bytes",data.length); if ([data length]) { NSString * outputString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; [_unixProgressUpdate setStringValue:outputString]; } if (unixTask != nil) { [fhError readInBackgroundAndNotify]; } } -(void) notifiedForComplete:(NSNotification *)anotification { NSLog(@"task completed or was stopped with exit code %d",[unixTask terminationStatus]); unixTask = nil; [_unixProgressBar stopAnimation:self]; [_unixProgressBar viewDidHide]; if ([unixTask terminationStatus] == 0) { [_unixProgressUpdate setStringValue:@"Success"]; } else { [_unixProgressUpdate setStringValue:@"Terminated with non-zero exit code"]; } } @end </code></pre>
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    1. COthanks this worked. I like how u put the declarations, some people dont and it really bugs me because i dont know what to put as declarations. Thank u again
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    2. COat the beginning in the IBAction, what are the declarations for the things whose strings are being set
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    3. COand is the part with the NSMutableArray necessary? Couldn't I just point to an .sh file and use /usr/bin/sh
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