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

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Don't believe everything you think
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