extracting null pointer address from PyCObject with ctypes

[Gordon Allott]

Aaron "Castironpi" Brady wrote:
> 
> You are hard to follow.  There is the 'cast' function, which I've had
> some success with, even in adding pointers and offsets.  It took a
> look at the code for it though, and calling an undocumented version of
> it.  I can post that later if you don't have luck the same.  You can
> write extension modules to do that as well, and there's always a
> Google search which personally I forget half the time too.  Last, you
> haven't mentioned an attempt with PyCObject_AsVoidPtr yet:
> 
> void* PyCObject_AsVoidPtr(PyObject* self)
>     Return the object void * that the PyCObject self was created with.
> 
> Where does that get you?
> --
> http://mail.python.org/mailman/listinfo/python-list

sorry yes you were right, I was reading PyCObject_AsVoidPtr as
PyCObject_FromVoidPtr :)

using AsVoidPtr is a little confusing, this is the code I am using:
        display = pygame.display.get_wm_info()['display']
        pyobj = py_object(display)
        ref = pointer(pyobj)

        print pythonapi.PyCObject_AsVoidPtr(ref)

it produces the following traceback:
Traceback (most recent call last):
  File "pygametest.py", line 125, in <module>
    app = PyGameOGREApp()
  File "pygametest.py", line 33, in __init__
    self._createWindow(width, height, fullscreen)
  File "pygametest.py", line 64, in _createWindow
    print pythonapi.PyCObject_AsVoidPtr(ref)
TypeError: PyCObject_AsVoidPtr with non-C-object

- I think that's because its a pointer to the ctypes py_object() rather
than the PyCObject we are dealing with but I have no idea how to create
a pointer to that.

-- 
Gord Allott (gordallott at gmail.com)

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