Python ctypes: Python file object <-> C FILE *

Question

I am using ctypes to wrap a C-library (which I have control over) with Python. I want to wrap a C-function with declaration:

int fread_int( FILE * stream );
         


        

Answer 1

Adapted from svplayer

import sys

from ctypes import POINTER, Structure, py_object, pythonapi


class File(Structure):
    pass

if sys.version_info[0] > 2:
    convert_file = pythonapi.PyObject_AsFileDescriptor
    convert_file.restype = c_int
else:
    convert_file = pythonapi.PyFile_AsFile
    convert_file.restype = POINTER(File)

convert_file.argtypes = [py_object]

fp = open('path').fp
c_file = convert_file(fp)