Re: [Pyobjc-dev] Passing ObjectiveC pointers to PyObjC

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

On 19 Feb, 2008, at 10:32, James Trankelson wrote:

> Hello,
>
> I'm trying to augment my existing ObjectiveC application with some
> embedded Python. I've got an embedded Python interpreter that can run
> PyObjC, but what I would like to do is the following:
>
> In my ObjectiveC application, I'd like to get a pointer to an object
> (an NSString, for example):
>
> NSString *tmpStr = [NSString stringWithString:@"Test"];
>
> Then, I would like to pass this NSString pointer to a Python function,
> so that I can use PyObjC to operate on the object in the normal PyObjC
> fashion:
>
> def handler(s):
>    print "The length of the string is ", s.length()
>
> I would try to call the Python handler() procedure like so:
>
> PyObject* arg;          // tmpStr
> PyObject* method;  // "handler"
> PyObject_CallMethodObjArgs(_self , method, arg, NULL);
>
> I don't know how to go about obtaining PyObject*s from the  
> ObjectiveC types...
>
> Is this even possible?

That's not impossible, but not the easiest way to do this. What I'd do  
is to define an (abstract) baseclass in Objective-C that defines the  
methods you want to call, use PyObjC to create a Python subclass of  
that baseclass which actually implements the functionality and then  
call those methods using normal Objective-C method calls. That way you  
don't have to write code to convert data from Objective-C to Python  
and back.

Ronald
>
>
> Thanks.
>
> -jim t
>
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