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Home > Forums > Programmers > Languages > Objective-C Forum

Newbie question: NSString goes out of scope when passed to method

Read More Threads Like This One

joelwyland (Programmer)

22 Oct 09 16:56

Hello,

I'm brand new to Objective-C so I run into things here and there that really confuse me. I'm trying to develop my first iPhone app currently. It works great in the Simulator, but when I install the app onto my iPhone I'm having a problem.

In one of my methods, I initialize an NSString and then pass that string (the filename of a sound file) to another method. I fired up the debugger and discovered that in the first method, the filename is intact and correct, but inside the playSound method the filename parameter is listed as "out of scope" in the debugger.

Any help would be appreciated, but this doesn't make a lot of sense to me. :) I've been coding for many years, but this is my first attempt at Objective-C and I haven't done standard C since college.

Thanks in advance!

CODE

- (IBAction) someMethod {

    // a bunch of code snipped ...

    NSString *filename = [[NSString alloc] initWithFormat:@"MySound%d.m4v", soundNum];
    [self playSound:filename];
    [filename release];
}

- (void) playSound: (NSString *)filename {

    @try {
        NSArray *nameParts = [filename componentsSeparatedByString:@"."];

        // a bunch of code snipped...

    }

    @catch (NSException *exception) {

        NSLog(@"playSound: Caught %@: %@", [exception name], [exception reason]);

    }

    @finally {

    }

}

theundergod (IS/IT--Management)

31 Dec 09 16:39

At what step is fileName listed as out of scope?

How are you calling the object within the array? With you given code I was able to extract the components of the string and then call on them using
[nameParts objectAtIndex:indexNumber];

without throwing an exception. Not sure what else to possibly suggest really.

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