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how to read in a number in hex and then get it in binary?

• To: mathgroup at smc.vnet.net
• Subject: [mg105151] how to read in a number in hex and then get it in binary?
• From: hanrahan398 at yahoo.co.uk
• Date: Mon, 23 Nov 2009 06:48:23 -0500 (EST)

Hi, newbie question I'm afraid, but I couldn't work out how to do this
from the help. I'm using Mathematica 5.2.

I've got a textfile containing a long list of numbers in hex. I can
read them in one by one, using e.g.

p=Read["hello.txt",Expression]

Then I would like to turn each number into a fixed-length binary
number, using something like

IntegerDigits[16^^p, 2, 27]

The problem is, this doesn't work. The argument of ^^ seems to need to
be an actual number in hex, e.g. 16^A12B3, rather than a variable.

Will be grateful for any help with this.
Thanks!
Michael