[Numpy-discussion] Numpy array from ctypes pointer object?
Mark Heslep
mark at mitre.org
Wed Jul 12 15:06:14 EDT 2006
Travis Oliphant wrote:
> Mark Heslep wrote:
>> I don't see a clean way to create a numpy array from a ctypes pointer
>> object. Is the __array_interface_ in ctypes the thing thats missing
>> needed to make this happen? I've followed Albert's Scipy cookbook
>> on ctypes here
>>
>> On the C side the PyArray_SimpleNewFromData( ..dimensions, ...data
>> ptr) C API does the job nicely. Is there a ctypes paradigm for
>> SimpleNew...?
>>
> Can you somehow call this function using ctypes?
>
> -Travis
That might work, though indirectly. As I think I understand from ctypes
docs: Ctypes uses functions exposed in a shared library, macros
existing only a header are not available. If its PyArray... is a macro
then I a) need to compile and make a little library directly from
arrayobject.h or b) need to use the root function upon which the macro
is based, PyArrayNew?
ctypes has built-in access to the functions in the core python library,
but Im not sure which library contains all the PyArray API calls, since
its all typically hidden by distutils and setup.py
Mark
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