[Numpy-discussion] Numpy array from ctypes pointer object?

Mark Heslep mark at mitre.org
Wed Jul 12 14:06:14 CDT 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


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