Re: [Rubycocoa-talk] Passing C Structs from Ruby to Obj-C (was: Importing Ruby Classes into Obj-C code)

[Knud H. M. <knu...@de...>]

Hi Ferhat,

thanks, I resolved the problem with the invalid initializer the way  
you described (a protocol works fine). However, I think my usecase  
involved another problem:

Ruby only knows objects, no simpe datatypes (if I'm not mistaken). So,  
anything that is returned from Ruby to Obj-C is always an object.  
Thus, if I have a ruby method:

def testNumber
    666
end

... and call that from Obj-C, I need to explicitly convert the return  
value to an integer (if I want that):

int aNumber = [[rubyObject testNumber] intValue];

That works. Now, what do I do with structs? E.g.:

def dimensions
     OSX::NSSize.new(1024, 1024)
     # or: OSX::NSMakeSize(1024, 1024)
end

And from Obj-C:

NSSize dimensions = [rubyObject dimensions];

This compiles (if I use the protocol method: http://www.rubycocoa.com/an-introduction-to-rubycocoa/4) 
, but results in nonsense data. Is there a way to do this correctly,  
or should I refrain from using structs alltogether?

Cheers,
Knud

Am 14.04.2008 um 13:32 schrieb Ferhat Ayaz:

> Ruby methods indeed do not define return types but Obj-C does. I'm  
> not sure but I guess  the problem is that you are sending an  
> "unknown" message to dataSource and it treads it as obj-c id type.  
> So you would see the same compiler error if you try.
>
> id something;
> NSSize originalSize = something;
>
> You have to define it in an obj-c interface.
>
> @interface KNTiledMap  (ImNotSureButMaybeYouHaveToDoItAsCategory)
> - (NSSize)dimensions;
> @end
>
>
> Ferhat
>
> ----- Original Message ----
> From: Knud Hinnerk Möller <knu...@de...>
> To: rub...@li...
> Sent: Monday, April 14, 2008 1:51:59 PM
> Subject: Re: [Rubycocoa-talk] Importing Ruby Classes into Obj-C code
>
>
> Am 14.04.2008 um 12:20 schrieb Ferhat Ayaz:
>
> > are you sure that [dataSource dimensions]; returns an NSSize?
>
> No, I can't be - Ruby methods don't define a return type. The error
> already happens at compile time, not at runtime.
>
> Knud
>
> >
> >
> > Ferhat
> >
> > ----- Original Message ----
> > From: Knud Hinnerk Möller <knu...@de...>
> > To: rub...@li...
> > Sent: Monday, April 14, 2008 12:56:52 PM
> > Subject: [Rubycocoa-talk] Importing Ruby Classes into Obj-C code
> >
> > Hi,
> >
> > please forgive me if this is a stupid question to ask, but is it
> > possible to import a Ruby class definition into Obj-C? What I mean  
> is
> > this:
> >
> > I have a RubyCocoa class:
> >
> > class KNTiledMap < OSX::NSObject
> >    attr_accessor :dimensions
> >    ...
> > end
> >
> > I have an Obj-C class in which I want to use the Ruby class:
> >
> > @interface KNTileView : NSView {
> >    KNTiledMap *dataSource;
> > }
> >
> > @implementation KNTileView
> >    ...
> >    NSSize originalSize = [dataSource dimensions];
> >    ...
> > @end
> >
> > This leads to a compile "error: invalid initializer".
> >
> > How can I make this work?
> >
> > Cheers,
> > Knud
> > -------------------------------------------------
> > Knud Möller, MA
> > +353 - 91 - 495086
> > Smile Group: http://smile.deri.ie
> > Digital Enterprise Research Institute
> >  National University of Ireland, Galway
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> >
> >
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> -------------------------------------------------
> Knud Möller, MA
> +353 - 91 - 495086
> Smile Group: http://smile.deri.ie
> Digital Enterprise Research Institute
>   National University of Ireland, Galway
> Institiúid Taighde na Fiontraíochta Digití
>   Ollscoil na hÉireann, Gaillimh
>
>
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-------------------------------------------------
Knud Möller, MA
+353 - 91 - 495086
Smile Group: http://smile.deri.ie
Digital Enterprise Research Institute
   National University of Ireland, Galway
Institiúid Taighde na Fiontraíochta Digití
   Ollscoil na hÉireann, Gaillimh