Re: [Pyobjc-dev] VTK bindings (Modified by Carlos Phillips)

[Carlos P. <ca...@ci...>]

On Dec 3, 2003, at 6:34 AM, Carlos Phillips wrote:

> On Dec 3, 2003, at 4:59 AM, Jack Jansen wrote:
>
>>
>> On 2 Dec 2003, at 18:38, Ronald Oussoren wrote:
>>> The problem is that PyObjCPointer is a not really a wrapped pointer, 
>>> when the PyObjCPointer object is created the value pointed-to is 
>>> copied into an internal buffer. Most of the time that doesn't work, 
>>> vtkRenderer is probably a C++ class and the copied value is invalid.
>>>
>>> I'll put creation of a real pointer wrapper on my todo-list, a 
>>> generic version of the types used to wrapped some other pointer 
>>> types (see pointer-support.m).
>>
>> Isn't cobject what you want here? It just gives you an opaque Python 
>> wrapper around a C pointer, but it looks like that could be good 
>> engouh.
>
> Actually, ideally I would be able to interact with the C++ objects 
> pointed to using the already existing python wrappers. I'm not sure 
> how this could be done though.
>
> What I have are objective-c++ files containing objective-c classes 
> with methods which take and return pointers to c++ classes. VTK has 
> its own python wrappers for these c++ classes. This allows for easy 
> construction of rendering pipelines. I could wrap the c++ classes in 
> objective-c and then wrap the new objective-c classes in python 
> through PyObjC. However, this would not allow me to interact with the 
> c++ classes directly in python using VTK python classes which is what 
> I want to do.
>
> So ideally I would like to be able to see the c++ classes taken and 
> returned by my objective-c classes as VTK python wrapper objects.
>
> Example:
> An unwrapped objective-c++ class VTKView has the following method.
> -(vtkRenderer *)renderer;
>
> vtkRenderer is a c++ class. There is python wrapper class by the same 
> name. I would like to wrap and/or alter VTKView so that I can do the 
> following in Python:
>
> v = VTKView.alloc().init()
> v.renderer().AddActor(...)
>
> or be able to use v.renderer() as an argument to some python wrapped 
> VTK method.

Actually, if I can't do this, I would settle for simply hiding the c++ 
pointer attributes and c++ related methods from PyObjC. Can I do that?

Carlos