Thanks Liverpol, that should work. My problem was I was breaking the address into bytes, then displaying each byte as an entry widget, using a label widget with ':' in it as a separator. I couldn't get the entry widgets to show my numbers as hex, they kept getting converted to decimal.

This is what I had. I'm pretty new to this stuff, learning perl and tk as I go. 

use strict;
use Tk;

# Take a 6 element array and make it string.

sub makeString {
   my @data = @_;

   my $result = sprintf "%02x:%02x:%02x:%02x:%02x:%02x",
               $data[0], $data[1], $data[2], $data[3], $data[4], $data
+[5];

   return $result;
}

sub doit {
   my @addy = @_;

   my $mw = MainWindow->new();

   # Show the current address
   my $current = makeString(@addy);
   $mw->Label(-text => $current)->pack(-side => 'top');

   # now build some entry widgets to change it
   for (my $i = 0; $i < 6; $i++) {
      $mw->Entry(-textvariable => \$addy[$i], -width => 3)
         ->pack(-side => 'left');
      $mw->Label(-text => ':', -width => 1)->pack(-side => 'left');
   }

   $mw->Button(-text => "Done", -command => sub {$mw->destroy;})
      ->pack(-side => 'bottom');
   MainLoop;
   return(@addy);
}

my @foo = (0x10, 0x22, 0x33, 0x4b, 0x5f, 0x6d);

print "Starting with: " . makeString(@foo) . "\n";
my @bar = doit(@foo);
print "Ended with: " . makeString(@bar) . "\n";

[download]

In reply to Re^2: How to enter a MAC address by snotnose
in thread How to enter a MAC address by snotnose

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.