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Re: More on NSTask and output to NSTextView
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Re: More on NSTask and output to NSTextView


  • Subject: Re: More on NSTask and output to NSTextView
  • From: p3consulting <email@hidden>
  • Date: Sun, 6 Jun 2004 09:48:02 +0200

Le juin 5, 2004, ` 13:47, Koen van der Drift a icrit :

> Hi,
>
> Thanks to all the good suggestions on the list I am now using an
> NSTask to launch a commandline program in a GUI. It all works very
> nice except displaying the output from the program in an NSTextView is
> displayed in chunks. After searching the archives it seems that this
> is caused by the NSTask - NSPipe - NSFileHandle combination that does
> some buffering. This has been discussed before and the general
> suggestion to prevent this is to use readInBackgroundAndNotify on the
> NSFileHandle. Here is a snippet:
>
> .....
> [startButton setTitle: @"Running"];
> [startButton setEnabled:NO];
>
> pipe = [[NSPipe alloc] init];
>
> myTask = [[NSTask alloc] init];
> [myTask setLaunchPath:[[NSBundle mainBundle]
> pathForResource:@"atask" ofType:nil]];
> [myTask setArguments:args];
>

Try adding here

NSMutableDictionary *defaultEnv = [[NSMutableDictionary alloc]
initWithDictionary:[[NSProcessInfo processInfo] environment]] ;

[defaultEnv setObject:@"YES" forKey:@"NSUnbufferedIO"] ;

[myTask setEnvironment:defaultEnv] ;

> [myTask setStandardOutput:pipe];
> handle = [pipe fileHandleForReading];
>
> [[NSNotificationCenter defaultCenter] addObserver:self
> selector:@selector(getData:)
>
> name:NSFileHandleReadCompletionNotification
> object:handle];
>
> [handle readInBackgroundAndNotify];
>
> [myTask launch];
>
> [pipe release];
>



Pascal Pochet
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  • Follow-Ups:
    • Re: More on NSTask and output to NSTextView
      • From: Koen van der Drift <email@hidden>
References: 
 >More on NSTask and output to NSTextView (From: Koen van der Drift <email@hidden>)

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