[SciPy-user] numpy array in ctype struct

Thomas Heller theller@ctypes....
Tue Jan 15 10:29:31 CST 2008


Travis E. Oliphant schrieb:
> Paul Kienzle wrote:
>> Hi,
>>
>> We are trying to create the following struct in ctypes:
>>
>>   struct {
>>     int n,k;
>>     double A[4][4], B[4][4];
>>   } ;
>>
>> Easy enough:
>>
>>   class embedded_array(Structure):
>>     _fields_ = [("n",c_int),("k",c_int),("A",c_double*16),("B",c_double*16)]
>>   instance = embedded_array()
>>
>> Question:
>>
>>   Is there a way to map the data in A/B into a numpy array, so that we
>>   can use it directly?
>>
>>   
> Yes.   You can create an array from a pointer to memory and a 
> description of the data that is much like the ctypes structure.   At 
> some point, there should be a direct conversion from ctypes objects to 
> NumPy data-types, but nobody has written that yet.

[...]

Is there anything that should be added to ctypes (Python 2.6 isn't too
far away) that would help with this conversion?

Thanks,
Thomas



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