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Nat!

Senior Mull.

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A little IMP oddity

This works in 10.3 but crashes in 10.2 In 10.2 you only see the messages from the first two NSLogs(non-IMP code)

#import <Foundation/Foundation.h>


int main (int argc, const char *argv[])
{
   NSAutoreleasePool   *pool;
   NSDictionary        *dictionary;
   IMP                 imp;

   pool = [[NSAutoreleasePool alloc] init];

   dictionary = [NSDictionary dictionaryWithObject:@"VfL"
                                            forKey:@"Bochum"];

NS_DURING
   [dictionary selectorThatDoesNotExist];
NS_HANDLER
   NSLog( @"Exception: %@", localException);
NS_ENDHANDLER
   NSLog( @"Calling unimplemented messages via objc_msgSend can be caught");

NS_DURING
   imp = [dictionary methodForSelector:@selector( selectorThatDoesNotExist)];
   (*imp)( dictionary, @selector( selectorThatDoesNotExist));
NS_HANDLER
   NSLog( @"Exception: %@", localException);
NS_ENDHANDLER
   NSLog( @"And calling them via IMP can also be caught");
 
   [pool release];
   return( 0);
}