Re: [Pyobjc-dev] Explicit conversion from ObjC to PyObject?

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

On 1 Aug, 2009, at 2:08, Greg Abbas wrote:

> FWIW I think I figured out how to do this: pyobjc-api.h defines
> several macros including PyObjC_ObjCToPython and PyObjC_PythonToObjC.
> The only wrinkle is that you need to make sure you call
> PyObjC_ImportAPI first (and be a little clever because of how it
> stores a function table pointer in a static variable), but it seems to
> work great.
>
> Well actually, there's sort of another wrinkle which is that as far as
> I can tell PyObjC_ImportAPI isn't an official or supported API. So
> caveat emptor, but hopefully it's pretty stable at this point.

The API is unsupported, but is used by the framework wrappers as well.  
I might clean up the API in a future release, but that should be  
doable while retaining backward compatibility for the bits of  
interface that are retained.

Using PyObjC_ObjCToPython and PyObjC_PythonToObjC will definitely be  
retained in future editions of the API.

Ronald

>
> On Jul 27, 2009, at 10:29 PM, Greg Abbas wrote:
>
>> Hi,
>>
>> Is it feasible to mix the "old-fashioned" Python C API with PyObjC?
>> Specifically, I'm exposing some C++ classes to Python using
>> PyType_Ready and all of that, but some of those methods are actually
>> Objective-C++ code and return Objective C instances such as  
>> NSColor. I
>> could manually wrap them too, but that seems wasteful considering all
>> the excellent work that's gone into creating PyObjC. Is there a way  
>> to
>> explicitly ask PyObjC to wrap an Objective C object and turn it  
>> into a
>> PyObject* proxy that I can return to the Python interpreter?
>>
>> All the PyObjC examples that I've found so far assume that you're not
>> using any other low-level interface, and so everything is magically
>> wrapped & unwrapped whenever it crosses the Python<->ObjC boundary.
>> But what if I want to participate in that boundary manually? Is there
>> a "PyObject * convertObjCToPython(id)" function that I can call? (Or
>> convertPythonToObjC, for that matter?)
>>
>> Thanks very much in advance for any insights.
>>
>> -greg abbas.
>>
>>
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