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Problem In How to print barcode label - Part 1 - EAN13 barcodes? we have printed EAN13 barcodes on a receipt printer using the ESC/POS commands.
In this Part 2, we will print UPC-A barcodes.
The UPC-A is a barcode system widely used in the United States and Canada, especially for items in the retail stores. It's a 12-digit number with the last number as the check digit as shown below.
To know what each digit means, please refer to the UPC-A Specification.
Solution Below are the steps for printing UPC-A barcodes:
- Select the barcode font.
- Select where to print the barcode text (above, below or none).
- Set the width and height of the barcode.
- Inform the printer that the barcode is in UPC-A format.
- Sends the UPC-A barcode to the printer. Note that you can send this as a 11-digit number (without the check digit) or a 12-digit number (with the check digit).
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$window = new GtkWindow();
$window->set_size_request(400, 150);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());
// display title
$title = new GtkLabel("Print Barcode Label (EAN13 only)");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);
$hbox = new GtkHBox();
$vbox->pack_start($hbox, 0, 0);
$hbox->pack_start(new GtkLabel("Enter/Scan Barcode: "), 0, 0);
$hbox->pack_start($entry = new GtkEntry(), 0, 0);
$hbox->pack_start($button = new GtkButton("Print Label"), 0, 0);
$entry->set_text('012345678912');
$entry->connect('activate', 'on_enter', $button);
$button->connect('clicked', 'on_click', $entry);
$window->show_all();
Gtk::main();
function on_enter($entry, $button) {
$keyword = $entry->get_text();
$button->clicked();
}
function on_click($button, $entry) {
$barcode = $entry->get_text();
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
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Explanation
- Establish the connection with the receipt printer through PRN.
- Please refer to Barcode printing on receipt printer using the ESC/POS Commands for explanations of these settings.
- Sends the UPC-A barcode to the printer. You will now see the UPC-A barcode printed on the receipt printer! Note that this must be either 11 digits (without the checkdigit) or 12 digits (with the check digit).
- Done!
Related Links
Resources on barcodes
Here are some useful links on barcodes:
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