Hello,
I'm new to cocoa and obj c programming. Thanks to such great mailling lists
like this one here, I have learned a lof during the last weeks. However here
is something I cannot cope with:
Code:
--------
I use this cocoa method to execute shell commands and shell scripts form my
cocoa app:
- (void)executeShellScript:(NSString*)path withArgs:(NSArray*)args {
NSLog(@"Testing NSLog: Entry");
NSString *fullpath = [path stringByExpandingTildeInPath];
NSFileManager *fm = [NSFileManager defaultManager];
if ([fm fileExistsAtPath:fullpath]) {
NSTask *shellProcess = [[NSTask alloc] init];
NSPipe *errorPipe = [[NSPipe alloc] init];
[shellProcess setLaunchPath:fullpath];
[shellProcess setArguments:args];
[shellProcess setStandardError:errorPipe];
[shellProcess launch];
[shellProcess waitUntilExit];
NSData *result = [[errorPipe fileHandleForReading]
readDataToEndOfFile];
if ([result length]>1) {
NSString *error = [[NSString alloc] initWithData:result
encoding:NSASCIIStringEncoding];
NSLog(error); //Normally I would show an error dialog with a
NSTextView here
[error release];
}
[shellProcess release];
}
else {
NSString *error = [fullpath stringByAppendingString:@": File does
not exist"];
NSLog(error); //Normally I would show an error dialog with a
NSTextView here
}
NSLog(@"Testing NSLog: Exit");
}
Problem:
-------
At the first glance: no problems! I can call shell commands, shell scripts
and retrieve stderr from the shell and display this stuff in cocoa.
The probelm is:
- When I call above method e.g. with [self
executeShellScript:@"/Users/siemoneit/Documents/LocationManager/heim/activate.sh"
withArgs:args];, .i.e. I try to execute a shell script, NSLog gets broken,
only outputs in the console "Testing NSLog: Entry" + "Hello" (=some ouput of
the shell script via echo) and nothing more. Further NSLog ouput is lost
totally. NSLog remains broken. You have to restart the app.
This is the shell script I call:
#!/bin/bash
echo Hello
exit 0
- When I call above method e.g. with [self executeShellScript:@"/bin/ls"
withArgs:args]; i.e. with a shell command, everything works fine! NSLog
doesn't get broken. Everything goes smoothly and nicely. The output is the
console is as expected: "Testing NSLog:Entry" + the command output +
"Testing NSLog: Exit". NSLog doesn't get broken.
What am I missing? What am I doing wrong? This drives me nuts...
Therefore: Any hint is highly appreciated!
Many thanks,
Oliver
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