A little comments of ctypes and construct.

[一首诗]

OK, I was wrong with construct!

I wrote to the author and he replied.  It works!

I am really glad there IS a easy way to handle binary data in python.

>>> from construct import *
>>>
>>>
>>> point = Struct("point",
...     SNInt32("x"),   # Signed, Native byte-order, Int 32 bits
('int' is platform specific, so your int may be different)
...     SNInt32("y"),
... )
>>>
>>> shape = Struct("shape",
...     SNInt32("z"),
...     Rename("ap",   # without the Rename field, the name would be
"point" (Arrays inherit their name from their element)
...         Array(2, point)
...     ),
... )
>>>
>>> c = shape.parse("zzzzxxxxyyyyXXXXYYYY")
>>> print c
Container:
    z = 2054847098
    ap = [
        Container:
            x = 2021161080
            y = 2038004089
        Container:
            x = 1482184792
            y = 1499027801
    ]
>>>