From: Daniel Martin <martin@...>
Date: 2007-06-26T03:53:45+09:00
Subject: Re: could anyone help me in the question, thanks?

Sonn Ygg <ys_manman@hotmail.com> writes:

> How could I do above in Ruby because I don't find how to specify the
> data type of variables or the address of variables in Ruby so far? I
> will deeply appreciate if anyone gives me any hint about it? Thanks a
> lot.

This is exactly the problem that Array.pack was designed to solve.
Quoting from a recent post of mine dealing with network headers in the
FSP protocol: (ruby-talk:256654)

  fsp_string = [fsp_pkt.cmd, 0, fsp_pkt.key,
                fsp_pkt.seq, fsp_pkt.len, fsp_pkt.pos].pack("CCnnnN")

Basically, make an array containing what you need, then use pack to
stuff it into a byte string with the proper width and alignment.  Then
write that byte string to your socket.

-- 
s=%q(  Daniel Martin -- martin@snowplow.org
       puts "s=%q(#{s})",s.to_a.last       )
       puts "s=%q(#{s})",s.to_a.last