From: Paul Battley <pbattley@...>
Date: 2006-06-18T04:58:29+09:00
Subject: Re: Generate a hex string from integers

On 17/06/06, Xavier Noria <fxn@hashref.com> wrote:
> On Jun 17, 2006, at 20:52, Michael stepanov wrote:
>
> > I'm new in Ruby. So, my question can seem simple for you. I need to
> > generate a hex string from some digits: 1, 114, 3, 2 for example. I
> > need
> > the following hex representation: 00010072030002 - (0x0001, 0x0072,
> > 0x03, 0x0002).
>
> sprintf to the rescue!
>
>    irb(main):002:0> sprintf "%04x"*4, 1, 114, 3, 2
>    => "0001007200030002"

Not a bad idea, but that won't exactly do it: he wants only one octet for the 3.

Try this:

hex_str = a.pack('nnCn').unpack('H*')[0] # => "00010072030002"

Paul.