GD::Barcode::UPCE - Create UPC-E barcode image with GD

       Kawai Takanori GCD00051@nifty.ne.jp

       The GD::Barocde::UPCE module is Copyright (c) 2000 Kawai Takanori. Japan.  All rights reserved.

       You may distribute under the terms of either the GNU General Public License or the Artistic License, as
       specified in the Perl README file.

       GD::Barcode::UPCE is a subclass of GD::Barcode and allows you to create UPC-E barcode image with GD.
       This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".

   new$oGdBar = GD::Barcode::UPCE->new($sTxt);

       Constructor.  Creates a GD::Barcode::UPCE object for $sTxt.  $sTxt has 6 or 7 or 8 numeric
       characters([0-9]).  If $sTxt has 6 characters, this module adds '0' at the front of $sTxt.  and
       calculates CD for you.  If $sTxt has 7 characters, this module calaculates CD for you.

   plot()$oGd = $oGdBar->plot([Height => $iHeight, NoText => 0|1]);

       creates GD object with barcode image for the $sTxt specified at new method.  $iHeight is height of the
       image. If NoText is 1, the image has no text image of $sTxt.

        ex.
         my $oGdB = GD::Barcode::UPCE->new('123456');
         my $oGD = $oGdB->plot(NoText=>1, Height => 20);
         # $sGD is a GD image with Height=>20 pixels, with no text.

   barcode()$sPtn = $oGdBar->barcode();

       returns a barcode pattern in string with '1', 'G' and '0'.  '1' means black, 'G' also means black but
       little bit long, '0' means white.

        ex.
         my $oGdB = GD::Barcode::UPCE->new('123456');
         my $sPtn = $oGdB->barcode();
         # $sPtn = '';

   $errStr
       $GD::Barcode::UPCE::errStr

       has error message.

   $text
       $oGdBar->{$text}

       has barcode text based on $sTxt specified in new method.

       GD::Barcode::UPCE - Create UPC-E barcode image with GD

       GD::Barcode

perl v5.40.1                                       2025-08-12                             GD::Barcode::UPCE(3pm)

ex.CGI

         use GD::Barcode::UPCE;
         binmode(STDOUT);
         print "Content-Type: image/png\n\n";
         print GD::Barcode::UPCE->new('123456')->plot->png;

       withErrorCheck

         my $oGdBar = GD::Barcode::UPCE->new('123456789');
         die $GD::Barcode::UPCE::errStr unless($oGdBar);       #Invalid Length