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Full Discussion: Barcode scanner buffer read manipulation
Operating Systems Linux Ubuntu Barcode scanner buffer read manipulation Post 302968976 by minharojr on Wednesday 16th of March 2016 04:09:11 PM
Old 03-16-2016
CPU & Memory Barcode scanner buffer read manipulation
Hello,

I'm facing some problems with a barcode scanner from Cygnal Inc, model Sweda SL-20. Info from lsusb -v:

Code:
Bus 003 Device 003: ID 10c4:ff11 Cygnal Integrated Products, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x10c4 Cygnal Integrated Products, Inc.
  idProduct          0xff11 
  bcdDevice            1.00
  iManufacturer           1 Gue℉Ā
  iProduct                2 Gue℉Ā
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           41
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              200mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              5 (error)
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               5
Device Status:     0x0001
  Self Powered

If I use the scanner on Windows or Linux default programs, no problem decoding the barcodes.

But I have a POS application that when I scan a barcode seems to be too fast for the application.

I used the manual barcode codes to setup the device, but no effect.

If I scan to gedit, nano, terminal, firefox, rdp client, etc, everything works, but in this particular application doesn't. I tried to contact the supplier, but they said that the device isn't certified by them, so no support at all.

Searching on google, I found several samples codes to simulate I want, I found bash script, python c++.

What I need is a way to intercept the input device buffer and resend the input with a bigger delay between each char.

How can I do this? using curses or ncurses?

Kind regards, JP
 

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LEARN ABOUT CENTOS

gd::barcode::coop2of5

Barcode::COOP2of5(3)					User Contributed Perl Documentation				      Barcode::COOP2of5(3)

NAME

       GD::Barcode::COOP2of5 - Create COOP2of5 barcode image with GD

SYNOPSIS

       ex. CGI

	 use GD::Barcode::COOP2of5;
	 binmode(STDOUT);
	 print "Content-Type: image/png

";
	 print GD::Barcode::COOP2of5->new('1234567890')->plot->png;

       with Error Check

	 my $oGdBar = GD::Barcode::COOP2of5->new('A12345678');
	 die $GD::Barcode::COOP2of5::errStr unless($oGdBar);   #Invalid Characters
	 $oGdBar->plot->png;

DESCRIPTION

       GD::Barcode::COOP2of5 is a subclass of GD::Barcode and allows you to create COOP2of5 barcode image with GD.

   new
       $oGdBar = GD::Barcode::COOP2of5->new($sTxt);

       Constructor.  Creates a GD::Barcode::COOP2of5 object for $sTxt.	$sTxt has numeric characters([0-9]).

   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::COOP2of5->new('12345678');
	 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::COOP2of5->new('12345678');
	 my $sPtn = $oGdB->barcode();

   $errStr
       $GD::Barcode::COOP2of5::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::COOP2of5 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::COOP2of5(3)
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