string, or integer?


Syntactic Confectionery Delight
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by Ryszard (Priest)

on May 10, 2004 at 14:57 UTC ( [id://352089]=perlquestion: print w/replies, xml )

Need Help??

Ryszard has asked for the wisdom of the Perl Monks concerning the following question:

Its the end of a very long day, and i'm a bit stuck.

I need to send two bytes to a daemon to let it know the message length, the bytes have to bytes and not an ascii representation of bytes.

For example, I want 00001001, not 00111001.

unpack("B*", int(length($msg)/256)) yeilds the latter, not the former, how do I force the case?

sigh.

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Re: string, or integer? by halley (Prior) on May 10, 2004 at 15:02 UTC
You should have guessed that `pack()` is the opposite of `unpack()`. From perldoc -f pack: The resulting string is the concatenation of the converted values. Typically, each converted value looks like its machine-level representation. `my $bytes = pack("n", 9); # network byte order for 0x0009` [download] -- `[ e d @ h a l l e y . c c ]`	[reply] [d/l] [select]
Re: string, or integer? by dave_the_m (Monsignor) on May 10, 2004 at 15:05 UTC
`pack 'n', length($msg)` [download] (Replace n with N or S or whatever depending on what order (if any) you need the two bytes in	[reply] [d/l]

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