On 2010 Sep 26, at 16:58, Ken Thomases wrote:

> Have you tried actually using the method that's in his log 
> (-initWithObjects:count:), instead of a different one?  Or even 
> +arrayWithObjects:count:?

Yes, but to make a long story short, I was stymied by the rocket science of 
class clusters and abstract classes.  The error says that 
+initWithObjects:count: was sent to NSCFArray.  So first I reverse-engineered 
from savannah.gnu.org what are the argument types.  They are id* (a C array of 
ids), and an unsigned int.  Then I constructed an invocation using the 
NSClassFromString(), @selector(), etc.  But upon invoking, the system told me 
that +initWithObjects:count: is not implemented the *abstract* class NSCFArray. 
 I don't know what the concrete subclass is :(

Another thing I tried was to replace the method +[NSCFArray 
initWithObjects:count:] using Method Replacement.  But it was never invoked, 
probably for the same reason, although interestingly -[NSCFArray 
objectAtIndex:] is invoked with great frequency.

So rather than fight all this stuff I thought I'd ask the more general 
question: Is it possible for the same exception in the same build to crash the 
app on one system but be handled with no crash on another system.  I believe it 
has something to do with exception handlers but I've never learnt this very 
well.

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