[MacRuby-devel] Crash with NSUInteger in delegate method

[Laurent Sansonetti]

Hi Łukasz,

Since the bark method is defined in Ruby, it means its return value
and arguments are objects (id). So, if you want to call the method
from Objective-C, you must pass an Objective-C object. In this case,
an NSNumber object should do it.

If the bark method was actually an Objective-C method overwritten in
Ruby, then passing the C integer would have worked.

Also, it is generally safer to use the -[performRubySelector:] method
when calling specialized Ruby methods (those with optional or splat
arguments). The Ruby method calling semantics differ a little bit from
Objective-C so it won't always work.

HTH,
Laurent

2009/5/21 Łukasz Adamczak <lukasz at czak.pl>:
> My question boils down to a simpler case:
>
> Ruby:
> --------
> class Dog
>  def bark(num = 1)
>    num.times { puts "woof!" }
>  end
> end
>
> Objective-C:
> ----------------
> id dog = [[MacRuby sharedRuntime] evaluateString:@"Dog.new"];
> [dog bark:3];
>
>
> Passing Objective-C int to a Ruby method crashes it.
>
> Assuming I don't have access to the Objective-C side (the caller) -
> how do I make it work?
>
> Thanks!
>
>
> --
> Regards,
> Łukasz Adamczak
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