python read binary structure from file

read_struct.py

from ctypes import *

libc = cdll.LoadLibrary("libc.so.6")

class POINT(Structure):
    _fields_ = ("x", c_int), ("y", c_int)


f = open("test_structure", "w")

p = POINT(10, 20)

libc.write(f.fileno(), pointer(p), sizeof(POINT))
libc.close(f.fileno())
del f

f = open("test_structure", "rb")

p = POINT()
#use libc read
libc.read(f.fileno(), byref(p), sizeof(POINT))
print(p.x, p.y)
libc.close(f.fileno())
del f

f = open("test_structure", "rb")
import struct
# use struct module
x, y = struct.unpack("ii", f.read())
print(x, y)