From: Brian Candler <B.Candler@...>
Date: 2007-03-11T18:44:04+09:00
Subject: Re: parse hex ascii

On Sun, Mar 11, 2007 at 11:20:16AM +0900, Mark Zvilius wrote:
> I want to parse a hex-ascii string into an array of numbers. For
> example:
> 
> "0164" => [1,100]
> 
> Essentially I need to iterate through character pairs and use
> String#hex:
> 
> "01".hex => 1
> "64".hex => 100
> 
> I can do this easily enough in "C style" with an index into the string,
> i.e. equivalent to a C "for" loop. But I'm interested in solutions that
> are more in the "Ruby style," using an iterator.
> 
> Suggestions?

["01FF"].pack("H*").each_byte { |b| puts b }

or:

["01FF"].pack("H*").unpack("C*").each { |b| puts b }

(the second form constructs an explicit array of Fixnums)

Regards,

Brian.