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Created on 2008-08-01 00:17 by dparolin, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Messages (2) | |||
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| msg70535 - (view) | Author: Dominique Parolin (dparolin) | Date: 2008-08-01 00:17 | |
Python Versions tested:
Windows 2.5.2 (r252:60911)
Debian Linux Python 2.4.4
Example:
>>> import struct
>>> struct.pack('HL', 1, 1)
results in '\x01\x00\x00\x00\x01\x00\x00\x00'
although '\x01\x00\x01\x00\x00\x00' was expected.
if concatenated or done separately
>>> struct.pack('H', 1) + struct.pack('L', 1)
result is as expected '\x01\x00\x01\x00\x00\x00'
or
'\x01\x00' and '\x01\x00\x00\x00' respectively
Error:
Length is 8 where it should be 6
This is as well true for "hl", "hL" and "Hl".
Free description:
I could not find another error regarding that, nor any information using
popular search.
Further no explanation found why that might be valid behaviour.
Regards,
Dominique
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| msg70536 - (view) | Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) *  |
Date: 2008-08-01 00:40 | |
The struct module is correct.
You see here the result of "alignment": the address of a long is always
a multiple of the size of a long.
The struct module mimics the C compiler: a "struct { short x; long y;
}", will actually occupy 8 bytes in memory (on a 32bit processor).
There are two padding bytes, that are not used.
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:37 | admin | set | github: 47731 |
| 2008-08-01 00:40:32 | amaury.forgeotdarc | set | status: open -> closed resolution: not a bug messages: + msg70536 nosy: + amaury.forgeotdarc |
| 2008-08-01 00:17:05 | dparolin | create | |