Re: [Pyobjc-dev] Passing objects between PyObjc and SWIG

[Ronald O. <ron...@ma...>]

On 20 Mar, 2008, at 11:27, Kyle Johnson wrote:
> I have a C library (Cairo) which accesses Core Graphics. I've wrapped
> it up in a SWIG binding so I can easily access it from Python.
>
> Everything is great when calling functions in it and passing around
> objects from Apple's CoreGraphics Python library (which they generated
> with SWIG as well). However, when I switch from using Apple's
> CoreGraphics to using PyObjc libraries (AppKit and Quartz) and try to
> pass a CGContextRef from a PyObjC lib to the SWIG-wrapped library I
> get errors because SWIG doesn't recognize the PyObjc wrapping of the
> object.
>
> So basically, I need to code something which converts the PyObjc
> internal type to a SWIG-understandable internal type.
>
> Here's the problem: I can't figure out where to dig around in PyObjc
> to find the representation of "core-foundation class CGContextRef." Is
> this something which is being generated automatically and not
> hand-coded somewhere?

Those types are automaticly generated.

You can use the __cobject__() method on all Objective-C or  
CoreFoundation objects to get a Python CObject that wraps the raw  
pointer.  That might be easier to convert to something that swig might  
understand.

Ronald