Pointers and arrays in Python ctypes Pointers and arrays in Python ctypes python python

Pointers and arrays in Python ctypes


python arrays pointers ctypes

You can cast with the cast function :)

>>> import ctypes>>> x = (ctypes.c_ulong*5)()>>> x<__main__.c_ulong_Array_5 object at 0x00C2DB20>>>> ctypes.cast(x, ctypes.POINTER(ctypes.c_ulong))<__main__.LP_c_ulong object at 0x0119FD00>>>>

python arrays pointers ctypes

You can cast the result, but ctypes allows you to use an array in place of a pointer, directly. The issue is the byref in your code (which would be the equivalent of a pointer to a pointer):

So instead of:

cresult = (c_ulong * num)()err = self.c_read_block(addr, byref(cresult), num)

try:

cresult = (c_ulong * num)()err = self.c_read_block(addr, cresult, num)

python arrays pointers ctypes

A more compact version of the solution from the first answer:

>>> from ctypes import *>>> x = (c_ulong*5)()>>> x<__main__.c_ulong_Array_5 object at 0x7f96852bd0e0>>>> cast(x, POINTER(c_ulong))<__main__.LP_c_ulong object at 0x7f96852bd170>

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