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Re: I need Hex conversion, not!

by AnomalousMonk (Abbot)
on Jan 07, 2013 at 22:54 UTC ( #1012126=note: print w/ replies, xml ) Need Help??


in reply to I need Hex conversion, not!

Here's a cut-down example of a pack approach to building a socket message. I leave you to fiddle with the checksum until it comes out right; I can never seem to get this sort of thing first-try.

>perl -wMstrict -le "my $SM = 0xfe; my @ADRDSTN = (0x00, 0x09, 0x01, 0x00); my $MID = 0x01; my $MDLH = 0x00; my $MDLL = 0x18; my $EM = 0xFD; ;; my @message = (@ADRDSTN, $MID, $MDLH, $MDLL); ;; my $packed_message = pack 'C*', @message; ;; my $checksum = 256 - unpack '%8C*', $packed_message; ;; my $msg_for_socket = pack 'C a* C C', $SM, $packed_message, $checksum +, $EM; ;; my $msg_for_debug = unpack 'H*', $msg_for_socket; print qq{'$msg_for_debug'}; " 'fe00090100010018ddfd'


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Re^2: I need Hex conversion, not!
by Anonymous Monk on Jan 09, 2013 at 09:29 UTC

    Thank you for your message but I'll continue with the methods above for now

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