Paul D Ainsworth <[EMAIL PROTECTED]> wrote:
> Greetings everyone. I'm a relative newcomer to python and I have a technical
> problem.
> I want to split a 32 bit / 4 byte unsigned integer into 4 separate byte
> variables according to the following logic: -
> bit numbers 0..7 byte 1
> bit numbers 8..15 byte 2
> bit numbers 16..23 byte 3
> bit numbers 24..31 byte 4
> Each of these byte variables to contain integer data from 0 to 255 (or 0 to
> FF in hex mode)
> I had thought that struct.unpack with an input message format of 'I' would
> be the way to do it, but its reporting an error that it doesn't want to
> accept an integer.
> Please can anyone advise?
Would something like this work?
def word2bytes(n):
"""Given an positive integer n, return a tuple of 4 bytes from
n's least significant 32-bits
"""
r = []
n &= 0xFFFFFFFFL
for i in range(4):
r.append(n & 0xFF)
n >>= 8
r.reverse()
return tuple(r)
--
Jim Dennis,
Starshine: Signed, Sealed, Delivered
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