Re: Can anyone confirm this IB Bug?
Re: Can anyone confirm this IB Bug?
- Subject: Re: Can anyone confirm this IB Bug?
- From: Jonathan Dann <email@hidden>
- Date: Sun, 3 Aug 2008 00:00:26 +0100
On 2 Aug 2008, at 20:41, Stephane Sudre wrote:
On Aug 2, 2008, at 8:08 PM, Jonathan Dann wrote:
Hi all,
I recently made an IBPlugin for one of my custom controls, which I
linked to my own framework. The framework had an NSArray category
with the method, -firstObject. When trying to run IB it kept
crashing before loading any of my custom control's code, the stack
trace showed that my -firstObject method was getting called (and
not by me).
Here's my implementation
- (id)firstObject;
{
return (id)CFArrayGetValueAtIndex((CFArrayRef)self, 0);
}
Which will raise an exception if the array has no elements. What I
think was happening is that somewhere in IB or InterfaceBuilderKit
a -firstObject method had been defined that returned nil when the
array was empty, so when my method was called, the caller was
expecting a method that *could* return nil. Am I right in my
diagnosis? In my mind such a method should raise for index out of
bounds, and I shouldn't insulate myself in framework code from
attempting to access out of bounds. It has caused me to refactor a
bunch of my code that called my -firstObject method; nothing big,
just annoying as I'd used it a lot.
I tend to believe CoreFoundation is not doing a lot of checks. So
don't expect exception or check for NULL values.
That's good to know Stephane, thank you.
Jonathan
http://espresso-served-here.com
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