Re: Mystifying index out of bounds error
Re: Mystifying index out of bounds error
- Subject: Re: Mystifying index out of bounds error
- From: Antonio Nunes <email@hidden>
- Date: Thu, 01 Nov 2012 15:37:28 +0100
On 1 Nov, 2012, at 15:24 , Mike Abdullah <email@hidden> wrote:
> Well that sounds an impossible problem, but might not be. Give us the crash report too.
12/10/2012 12:41:10: -[__NSCFConstantString characterAtIndex:]: Range or index out of bounds
12/10/2012 12:41:10: (
0 CoreFoundation 0x00007fff9354a0a6 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff8ba543f0 objc_exception_throw + 43
2 CoreFoundation 0x00007fff93549e7c +[NSException raise:format:] + 204
3 CoreFoundation 0x00007fff9350e8ee -[__NSCFString characterAtIndex:] + 94
4 PDF Nomad 0x000000010380b5fe PDF Nomad + 1205758 ( -> -[ANBorderedTextView keyDown:] (in PDF Nomad) (ANBorderedTextView.m:91) )
5 AppKit 0x00007fff8a9ba120 -[NSWindow sendEvent:] + 9687
6 AppKit 0x00007fff8a9b5744 -[NSApplication sendEvent:] + 5761
7 AppKit 0x00007fff8a8cb2fa -[NSApplication run] + 636
8 AppKit 0x00007fff8a86fcb6 NSApplicationMain + 869
9 PDF Nomad 0x00000001036e6f84 PDF Nomad + 8068
)
Unfortunately, I did not receive a full crash report, so I can't show register contents.
-António
> 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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