Question

I need to call a c library from my python code. The c library does a lot of image manipulation, so I am passing it image buffers allocated using create_string_buffer.

The problem is that I also need to manipulate and change these buffers. What is the best way to reach in and twiddle individual values in my buffers? The buffers are all uint8 buffers.

Answer 1

You mean, something like…:

>>> import ctypes
>>> x = ctypes.create_string_buffer('howdy!')
>>> x.value
'howdy!'
>>> x[0] = 'C'
>>> x.value
'Cowdy!'

…?