Meador Inge mead...@gmail.com added the comment:
Without seeing a specific example of what you are trying to do, it is hard to
tell whether ctypes would be a good fit. I am closing this issue since the
original questions have been answered. Please open a new issue if you think
ctypes could
Pavel Boldin boldin.pa...@gmail.com added the comment:
We have raw data packages from some tools. These packages contains bitfields,
arrays, simple data and so on.
We want to parse them into Python objects (structures) for analysis and
storage. I tried to use ctypes, but now I wrote myself
Pavel Boldin boldin.pa...@gmail.com added the comment:
OK. So, it seems just like ctypes work, but don't for my needs.
Thing that bothers me anyway is the strange code, where size contains either
size (when bitsize==0) or bitsize in upper 16 bits and bitoffset in lower 16
bits.
--
Meador Inge mead...@gmail.com added the comment:
Would you mind explaining your use case and why ctypes won't fit it? Maybe
there is something that can be fixed.
FWIW, I agree that the overloading of 'size' is unnecessary.
--
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Python tracker
Meador Inge mead...@gmail.com added the comment:
Pavel, I looked into to this a little more and have some ideas. First off,
'_swappedbytes_' is an undocumented implementation detail that is used to
implement the LittleEndianStructure and BigEndianStructure types. So using it
directly like
Pavel Boldin boldin.pa...@gmail.com added the comment:
Yes. Thanks. But here is another error:
import ctypes
class X(ctypes.Structure):
_pack_ = 1
_fields_ = [
('a', ctypes.c_ubyte, 4),
('b', ctypes.c_ubyte, 4),
('c', ctypes.c_ushort, 4),
('d',
Meador Inge mead...@gmail.com added the comment:
Yes I can. This seems strange, but it is correct. The little endian case look
like:
Little endian
---
| unsigned short | unsigned short |
---
|
New submission from Pavel Boldin boldin.pa...@gmail.com:
ctypes seems to work incorrectly with _swappedbytes_ specified.
I.e. it misses some values from buffer:
class X(ctypes.Structure):
_swappedbytes_ = 1
_pack_ = 1
_fields_ = [
('a', ctypes.c_ubyte, 4),
('b',
Meador Inge mead...@gmail.com added the comment:
I can reproduce this on Fedora 15 with the Python tip revision. I am
investigating the behavior now.
--
nosy: +meadori
stage: - needs patch
type: - behavior
versions: +Python 3.2, Python 3.3
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