I've processed binary data streams in Perl using pack and unpack, working from an existing definition.

To design your own binary protocol, start with a list of requirements. Like, why does it have to be "binary"? In one case of mine, it was intended to be small. Or perhaps it needs to be able to update-in-place in a file? In any case, list those issues first. Then I'll be happy to discuss with you more.

In reply to Re: deal data transfer by John M. Dlugosz
in thread deal data transfer by xiaoyafeng

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