Storing a C pointer in a Python class instance

Falcolas garrickp at
Tue Sep 29 18:24:05 CEST 2009

On Sep 29, 2:27 am, "lallous" <lall... at> wrote:
> Hello
> From my C extension module I want to store a C pointer in a given PyObject.
> The only way I figure how to do it is to use Py_BuildValues and store the
> poiner casted to Py_ssize_t, thus:
> Py_BuildValues("n", (Py_ssize_t)my_ptr)
> Can it be done differently?
> Regards,
> Elias

You can use a "PyCObject_FromVoidPtr"

PyArg_ParseTuple(args, "O", &pyVoidPointer);
castPointer = (type *) PyCObject_AsVoidPtr(pyVoidPointer);
return PyCObject_FromVoidPtr((void *) castPointer, NULL);

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