[Numpy-discussion] Getting a numpy array from a ctype pointer
Travis E. Oliphant
Thu Sep 4 15:01:17 CDT 2008
Paulo J. S. Silva wrote:
> I am writing some code interfacing C and Python using ctypes. In a
> callback function (in Python) I get in a parameter x which is c_double
> pointer and a parameter n which is c_int representing the length of the
> How can I transform this information into a numpy array?
Something like this may work:
from numpy import ctypeslib
r = ctypeslib.as_array(x._type_ * n)
If that doesn't work, then you can create an array from an arbitrary
buffer or any object that exposes the __array_interface__ attribute.
So, if you can get the address of c_double then you can use it as the
data for the ndarray.
Ask if you need more help.
More information about the Numpy-discussion