Hi Alan,
I didn't look in further details yet, but clearly your initWithBlock method is
wrong, it should be:
- (id)initWithBlock:(void (^)())aBlock;
{
if ((self = [super init])) {
block = [aBlock copy];
NSLog(@"Block: %@", block);
block();
}
return self;
}
You are not assigning `self` to be equal to what `[super init]` returns, and
this is, even without macruby or blocks, prone to crashes :-)
Can you try to fix this and then tell us if it's still crashing?
--
Thibault Martin-Lagardette
On Nov 19, 2010, at 10:14, Alan Skipp wrote:
> I've been attempting to get an objective-c framework to work with macruby and
> I believe I've found a bug in the way ruby Proc objects are copied when used
> as objective-c blocks.
> The copied block doesn't seem to persist correctly beyond the scope in which
> it was copied. It isn't deallocated, but calling it results in a crash.
> Typical error messages are:
> wrong type NSCFSet (expected Proc) (TypeError)
> wrong type NSRectSet (expected Proc) (TypeError)
> I'm guessing that there's a pointer to the wrong memory location?
>
> Here's the Objective-C implementation:
>
> @implementation TestBlock
>
> - (id)initWithBlock:(void (^)())aBlock;
> {
> [super init];
> block = [aBlock copy];
> NSLog(@"Block: %@", block);
> block();
> return self;
> }
>
> - (void)callBlock;
> {
> NSLog(@"block: %@", block);
> block();
> }
>
> @end
>
>
> Within 'initWithBlock:', the copied block can be invoked without error.
> Attempting to do so from 'callBlock', results in a crash. The test framework
> can be used without error when using objective-c.
>
> Here's the ruby controller code:
>
> @b = TestBlock.alloc.initWithBlock Proc.new { puts "hello from ruby"}
>
> # this next line is called from a different scope and causes the crash
> @b.callBlock
>
>
> 2010-11-19 08:41:06.620 CallObjectiveCBlocks[7046:a0f] Block:
> <__NSAutoBlock__: 0x200be74a0>
> hello from ruby
>
> 2010-11-19 08:41:20.011 CallObjectiveCBlocks[7046:a0f] block:
> <__NSAutoBlock__: 0x200be74a0>
> 2010-11-19 08:41:20.012 CallObjectiveCBlocks[7046:a0f]
> /Users/alan/Documents/programming/macruby/CallObjectiveCBlocks/build/Debug/CallObjectiveCBlocks.app/Contents/Resources/Controller.rb:21:in
> `call:': wrong type Array (expected Proc) (TypeError)
> from
> /Users/alan/Documents/programming/macruby/CallObjectiveCBlocks/build/Debug/CallObjectiveCBlocks.app/Contents/Resources/rb_main.rb:23:in
> `<main>'
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