09-18-2016
Many thanks to all of you!
Now. I think you are overthinking the things.
Someone told something about a barcode scan reader and he got it -That is exactly my case.
I have my normal keyboard and also I have this barcode reader that enter text like a keyboard.
What I want is to read the text from the scanner in asynchronous mode and avoid this one mess with the real keyboard input that I want to let work as usual.
Why this thing has to be so complicated?
I don't think we have to deal with interrupts and all of that. It would need to be done in the unix way, by just reading files.
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LEARN ABOUT CENTOS
gd::barcode::code39
Barcode::Code39(3) User Contributed Perl Documentation Barcode::Code39(3)
NAME
GD::Barcode::Code39 - Create Code39 barcode image with GD
SYNOPSIS
ex. CGI
use GD::Barcode::Code39;
binmode(STDOUT);
print "Content-Type: image/png
";
print GD::Barcode::Code39->new('*CODE39IMG*')->plot->png;
with Error Check
my $oGdBar = GD::Barcode::Code39->new('*123456789;*');
die $GD::Barcode::Code39::errStr unless($oGdBar); #Invalid Characters
DESCRIPTION
GD::Barcode::Code39 is a subclass of GD::Barcode and allows you to create CODE-39 barcode image with GD. This module based on "Generate
Barcode Ver 1.02 By Shisei Hanai 97/08/22".
new
$oGdBar = GD::Barcode::Code39->new($sTxt);
Constructor. Creates a GD::Barcode::Code39 object for $sTxt.
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::Code39->new('*12345*');
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' and '0'. '1' means black, '0' means white.
ex.
my $oGdB = GD::Barcode::Code39->new('*12345*');
my $sPtn = $oGdB->barcode();
# $sPtn = '';
$errStr
$GD::Barcode::Code39::errStr
has error message.
$text
$oGdBar->{text}
has barcode text based on $sTxt specified in new method.
AUTHOR
Kawai Takanori GCD00051@nifty.ne.jp
COPYRIGHT
The GD::Barocde::Code39 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::Barcode
perl v5.16.3 2003-05-29 Barcode::Code39(3)