Re: [Pyobjc-dev] Accessing python classes in obj-c

[Jiva D. <ji...@de...>]

On Dec 8, 2003, at 2:09 PM, b.bum wrote:

> On Dec 8, 2003, at 12:17 PM, Jiva DeVoe wrote:
>> So I understand that I can create Python files and the templates 
>> supplied with PyObjC automatically will load those Python files and 
>> do what ever I want them to.  I also understand if I instantiate a 
>> python class in python, and access it in obj-c, I will get a proxy 
>> object to the python object.  However, what if I have an objective-c 
>> application, and I want to write a portion of it in python.  So, in 
>> other words, I want to be able to create a class in Python, and 
>> instantiate an object in objective-c that is of that class.  How 
>> would I do that? Would I have to use something like SWIG?
>
> Compile time is a bit harder.   In particular, you can't refer to any 
> class implemented in python directly because there won't be a real 
> class object to link against as the source is compiled.   To solve 
> this problem, I have used an abstract superclass implemented in 
> Objective-C (a class that simply declares all the methods where the 
> implementation is stubbed out) and a concrete subclass implemented in 
> Python.  To the abstract superclass-- the objc class-- I have added a 
> factory method that instantiates and returns the concrete subclass.
>

I know this is an old post, my apologies... just wanted a 
clarification.  How do you instantiate the concrete subclass in the 
factory method without having the real class?

Any pointers to some example code for this?

--
Jiva DeVoe
jiva at devoesquared.com
http://www.devoesquared.com