On 12/16/2011 04:16 PM, Fabrice Silva wrote:
> Le vendredi 16 décembre 2011 à 15:33 +0100, Gregor Thalhammer a écrit :
>>> Even better: the addendum!
>>> http://blog.enthought.com/python/numpy/simplified-creation-of-numpy-arrays-from-pre-allocated-memory/
>>>
>>> Within cython:
>>> cimport numpy
>>> numpy.set_array_base(my_ndarray, PyCObject_FromVoidPtr(pointer_to_Cobj,
>>> some_destructor))
>>>
>>> Seems OK.
>>> Any objections about that ?
>>
>> This is ok, but CObject is deprecated as of Python 3.1, so it's not portable
>> to Python 3.2.
>
> My guess is then that the PyCapsule object is the way to go...
>
Another way: With recent NumPy you should be able to do something like
this in Cython
cdef class SomeBufferWrapper:
...
def __getbuffer__(self, ...): ...
def __releasebuffer__(self, ...): ..
arr = np.asarray(SomeBufferWrapper(buf))
and then __releasebuffer__ will be called then `arr` goes out of use.
See Cython docs.
Dag
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