Re: Help debugging array indexing problem
Re: Help debugging array indexing problem
- Subject: Re: Help debugging array indexing problem
- From: Ken Thomases <email@hidden>
- Date: Fri, 11 Feb 2011 13:51:12 -0600
On Feb 11, 2011, at 1:27 PM, email@hidden wrote:
> I'm getting this error when clicking between two tables in my application:
> -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
>
> I've checked my arrays and they are not the problem. I've added NSAsserts to check my array indeces. It appears to be coming from the frameworks. I set breakpoints at both -[NSException raise] and frpintf (found these tips in the archives), but these are never hit. Specifically, when if I click back and forth between the tables, at some point the error appears. It occurs randomly. I can click in the left table and then the right table without seeing the error, but if I continue to alternate clicks, at some point I'll get the error. How can I debug this without having to set a breakpoint on [NSCFArray objectAtIndex:]? Its called way too much. To be clear, no exception is raised. I would expect an NSRangeException, but I see nothing but the above error.
Try a breakpoint on objc_exception_throw instead of -[NSException raise]. Not all exceptions go through the latter.
You can also put a breakpoint on NSLog and friends (or asl_log and friends) if your app is otherwise quiet in terms of console output.
Cheers,
Ken
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