Question

i’m coding on a Linux debian machine with python 2.4.

My neighbour with Windows XP and python 2.4.4

He can run this code:

w1, w2, w3 = unpack("LLL", pack("LLHH", localtime, ipddr, counter, aid))

But when i try this code i become this error:

w1, w2, w3 = unpack("LLL", pack("LLHH", localtime, ipddr, counter, aid))
struct.error: unpack str size does not match format

Can it be the Version of python or maybe the system?

Answer 1

Use the I format code instead of L.

On your Linux machine, L isn’t twice as long as H, it’s four times as long — 8 bytes (64 bits) instead of 4 bytes (32 bits).

I should be 4 bytes (32 bits) on both.

Edit: Make sure to read eryksun’s comment.