GD::Barcode

Create barcode images with GD

Synopsis

Example: CGI

use GD::Barcode::UPCE;
binmode(STDOUT);
print "Content-Type: image/png\n\n";
print GD::Barcode->new('EAN13', '123456789012')->plot->png;

With Error Check

my $oGdBar = GD::Barcode->new('EAN13', '12345678901');
die $GD::Barcode::errStr unless($oGdBar);     # Invalid Length
$oGdBar->plot->png;

Description

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

From version 1.14, you can use this module even without GD (except the plot method).

new

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

Constructor. Creates a GD::Barcode::$sType object for $sTxt.

plot()

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

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

Example:

my $oGdB = GD::Barcode->new('EAN13', '123456789012');
my $oGD = $oGdB->plot(NoText=>1, Height => 20);
# $oGD is a GD image with Height=>20 pixels, with no text.

barcode()

$sPtn = $oGdBar->barcode();

Returns a barcode pattern as a string with '1' and '0'. '1' means black, '0' means white.

Example:

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

$errStr

$GD::Barcode::errStr

Contains error messages.

$text

$oGdBar->{text}

Contains the barcode text based on $sTxt specified in the new method.

Contributing

For information about code formatting, git hooks, and testing, see DEVELOPING.md.

Author

Kawai Takanori GCD00051@nifty.ne.jp

Copyright

The GD::Barcode 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.

See Also

• GD
• GD::Barcode subclasses