Re: [Rubycocoa-talk] return simple int from Ruby to ObjC

[Motohiro T. <mo...@gm...>]

Right, I got correct return value !

thank you for your help.

2007/7/15, Laurent Sansonetti <lsa...@ap...>:
> Oops, please try
>
>    objc_method :getInt, ['int']
>
> The second argument of objc_method is supposed to be an Array. I will
> fix the method to accept a String.
>
> Laurent
>
> On Jul 15, 2007, at 3:55 PM, Motohiro Takayama wrote:
>
> > Laurent:
> >
> > Thanks for your quick reply.
> >
> > I tried your advice, and observed strange behavior.
> >
> > class Hoge < OSX::NSObject
> >       objc_method :getInt, 'int'
> >       def getInt
> >               5
> >       end
> > end
> >
> > and when call this, NSLog shows:
> >
> > 2007-07-15 22:50:15.667 retval[7097] XXX returning ffi type void for
> > unrecognized encoding 'nt'
> >
> > I'm wondering why "i" of int is lack...
> >
> > 2007/7/15, Laurent Sansonetti <lsa...@ap...>:
> >> When creating a Ruby method like this, without providing its ObjC
> >> runtime signature, RubyCocoa will assume that all arguments and the
> >> return value are Objective-C objects (of the type 'id'). Because
> >> there
> >> is no way for RubyCocoa to know. This is why you get from the ObjC
> >> world an NSNumber and not an "int".
> >>
> >> To work around this, you need to register the Ruby method into the
> >> ObjC runtime:
> >>
> >>   def getInt ... end
> >>   objc_method :getInt, 'int'
> >>
> >> This will register getInt as a method that doesn't take any argument
> >> and returns a C integer.
> >>
> >> Usually when you are overriding an ObjC method from Ruby, or
> >> implementing an ObjC informal protocol in Ruby, you don't need to use
> >> objc_method. But in this special case, it is required. Fortunately,
> >> most people won't need to use it.
> >>
> >> Laurent
> >>
> >> On Jul 15, 2007, at 3:01 PM, Motohiro Takayama wrote:
> >>
> >>> Hi,
> >>>
> >>> I'm wondering how to return simple "int" type value from Ruby code
> >>> to
> >>> Objective-C code.
> >>> Ruby code passes Fixnum, and Objective-C code recieves NSCFNumber
> >>> instead of simple int.
> >>> Any suggestion ?
> >>>
> >>>
> >>> Ruby code:
> >>>
> >>> class Hoge < OSX::NSObject
> >>>   def getInt
> >>>     5
> >>>   end
> >>> end
> >>>
> >>>
> >>> Objective-C code:
> >>>
> >>>      Class helper = NSClassFromString(@"Hoge");
> >>>      id hoge = [[helper alloc] init];
> >>>      NSLog(@"%@ %d", [[hoge getInt] class], [(NSNumber *)[hoge
> >>> getInt]
> >>> decimalValue]);
> >>>
> >>>
> >>> and those show:
> >>>
> >>> 2007-07-15 21:52:56.954 retval[5100] NSCFNumber 8448
> >>>
> >>>
> >>> thanks,
> >>>
> >>> --
> >>> Motohiro Takayama
> >>> http://blog.deadbeaf.org/
> >>>
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