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Re: Mystifying index out of bounds error
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Re: Mystifying index out of bounds error


  • Subject: Re: Mystifying index out of bounds error
  • From: Mike Abdullah <email@hidden>
  • Date: Thu, 01 Nov 2012 14:24:21 +0000

Well that sounds an impossible problem, but might not be. Give us the crash report too.

On 1 Nov 2012, at 12:11, Antonio Nunes <email@hidden> wrote:

> Hi,
>
> I have this code in my app:
>
> - (void)keyDown:(NSEvent *)theEvent
> {
> 	unichar		oneChar;
> 	NSString	*theChars = [theEvent charactersIgnoringModifiers];
>
> 	if ( 0 == theChars.length ) {
> 		return;
> 	}
>
> 	oneChar = [theChars characterAtIndex:0];
>
> 	…
> }
>
> After about 10 months of the app being available, with this method unchanged, I received a single crash report that points to a crash on the last line:
> -[__NSCFConstantString characterAtIndex:]: Range or index out of bounds
>
>
> The length property of a string returns an NSUInteger, so it should never be lower than zero. I don't see how the out of bounds error could ever happen for index 0, when the string has a length greater than 0. Any ideas? (Considering that I only ever received a single report for what is an often exercised bit of code, should I just consider this a freak incident and ignore it?)
>
> -António
>
> -----------------------------------------------------------
> Don't believe everything you think
> -----------------------------------------------------------
>
>
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