Re: [Rubycocoa-talk] RubyCocoa and alias_method_chain ?

[Satoshi N. <sna...@in...>]

I tried to solve this problem, but I cannot find a way to call the =20
original OCObjWrapper#method_missing.  If you copy and paste the code =20=

in oc_wrapper.rb, it works well.
Does anyone know a better way?


require 'osx/cocoa'
require 'rubygems'
require 'active_support'

module OSX
   class CIImage
     def method_missing_with_example(sym, *args, &block)
       method_missing_without_example(sym, *args, &block)
     end

     def method_missing(mname, *args)
       m_name, m_args, as_predicate =3D analyze_missing(mname, args)
       begin
         result =3D self.ocm_send(m_name, mname, as_predicate, *m_args)
       rescue OCMessageSendException =3D> e
         if self.private_methods.include?(mname.to_s)
           raise NoMethodError, "private method `#{mname}' called for =20=

##{self}"
         else
           raise e
         end
       end
     end

     alias_method_chain :method_missing, :example
   end
end

original =3D
OSX::CIImage.imageWithContentsOfURL(OSX::NSURL.fileURLWithPath('/Users/=20=

crafterm/Desktop/leaves_desktop.jp'))
p original.extent.size

--
Satoshi Nakagawa

On 2007/12/10, at 7:33, Satoshi Nakagawa wrote:

> Hi,
>
> RubyCocoa defines Object.method_missing to realize a transparent
> bridge between Ruby and Cocoa.  If you redefine method_missing of a
> class, then=10=10=10=10=10=10 the class won't respond to any ObjC =
methods.  That's
> why alias_method_chain doesn't work.
>
> --
> Satoshi Nakagawa
>
> On 2007/12/09, at 10:47, Marcus Crafter wrote:
>
>> Hi All,
>>
>> Hope all is going well!
>>
>> I'm trying to extend method_missing on OSX::CIImage using
>> alias_method_chain and are having trouble getting it to work, here's
>> an example to demonstrate it:
>>
>> require 'rubygems'
>> require 'active_support'
>> require 'osx/cocoa'
>>
>> module OSX
>>  class CIImage
>>    def method_missing_with_example(sym, *args, &block)
>>      method_missing_without_example(sym, *args, &block)
>>    end
>>
>>    alias_method_chain :method_missing, :example
>>  end
>> end
>>
>> original =3D
>> OSX::CIImage.imageWithContentsOfURL(OSX::NSURL.fileURLWithPath('/
>> Users/
>> crafterm/Desktop/leaves_desktop.jpg'))
>> puts original.extent.size
>>
>> When I run this I get:
>>
>> 	NoMethodError: undefined method =91extent=92 for =
#<OSX::CIConcreteImage:
>> 0x117248c>
>>
>> If I comment out the call to alias_method_chain I get the expected
>> result:
>>
>> 	#<OSX::CGSize:0x1173710>
>>
>> Somehow alias_method_chain breaks it. This is using Ruby & RubyCocoa
>> as per a default install of Leopard, Rails 2.0.1 active support gems.
>>
>> Any thoughts what might be going on or what I could try to get it
>> working?
>>
>> Cheers,
>>
>> Marcus