From: Gabriele Marrone <gabriele.marrone@...>
Date: 2006-11-03T09:13:49+09:00
Subject: RubyCocoa - selectors for Ruby classes

Hello.
I'm using the RubyCocoa framework (well, trying to), freshly compiled  
today (oops, yesterday) from the svn stable repository.

I want my application controller to get asynchronous notifications  
when a file descriptor has new data to be read, so I decided to use  
OS X infrastructure.
Here is the interesting part of the code:


class Controller < OSX::NSObject
   addRubyMethod_withType('dataAvailable:', 'v@:@')
   def dataAvailable(obj)
     # do something
   end
   def setup_notification_observer
      
OSX::NSNotificationCenter.defaultCenter.addObserver_selector_name_object 
(
       self,
       'dataAvailable:',
       "NSFileHandleDataAvailableNotification",
       @fileHandle
     )
   end
   def setup_data_available_notification
     @fileHandle.waitForDataInBackgroundAndNotify
   end
...
end


Of course setup_data_available_notification and  
setup_notification_observer are called by awakeFromNib.

Everything should be right, but when the default center tries to send  
my Controller a message I get logged:


2006-11-03 00:46:37.262 Fango[19411] Exception raised during posting  
of notification.  Ignored.  exception: *** -[NSProxy  
forwardInvocation:] called!


It looks like it can find the method signature (provided by  
addRubyMethod_withType), but the forwardInvocation: method of the  
Objective-C wrapper to my ruby Controller class doesn't actually call  
my ruby method. In fact, this makes me suppose forwardInvocation:  
isn't overrided at all and the message is catched by the parent class  
which raises an exception, but I haven't read RubyCocoa source code  
so I can't be sure.

I followed closely what's written here: http://www.rubycocoa.com/ 
appleremote/2 . I double checked Apple documentation of  
NSNotificationCenter, NSFileHandle.
I also searched on google for other documentation about selectors and  
RubyCocoa, but all I could get was code with japanese comments which  
didn't use addRubyMethod_withType at all. I guess that code was for  
another version of RubyCocoa (newer, maybe? From the unstable  
repository?).

This is what I tried:
- removing addRubyMethod_withType
- adding ns_override
- using :dataAvailable_, :dataAvailable, 'dataAvailable' instead of  
'dataAvailable:'
- defining the method dataAvailable_ instead of dataAvailable
- something else I can't remember :P
Most of which I didn't expect to actually work, but decided to try  
anyway. Some bugs just make you paranoid.

I'm using Mac OS X 10.4.8 (PPC), XCode 2.4.

Any ideas? :)
Thanks in advance!