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Problem We have covered printing of EAN13 in Part 1 and priting of UPC-A barcodes in Part 2.
In this Part 3, we will print UPC-E barcodes.
The UPC-E barcode is the short form representation of a UPC number. It reduces the data length from 12 digits to 6 digits by compressing the extra zeros as shown below. It is generally used on products with very small packaging where a full UPC-A barcode couldn't reasonably fit.
To learn more about the UPC-E format and how to convert from UPC-E to UPC-A, please refer to the UPC-E Specification.
Solution Below are the steps for printing UPC-E 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-E format.
- Convert the UPC-E barcode to UPC-A format.
- Send the UPC-A barcode to the printer. This should be a 11-digit number (without the check digit) or a 12-digit number (with the check digit).
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| <?php
$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('224290');
$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();
$upc_a = upc_e_to_a($barcode); // note 1
echo "upc_a equivalent for $barcode = $upc_a\n";
print_barcode($upc_a);
}
function print_barcode($barcode) {
$handle = fopen('PRN', 'w'); // note 4
fwrite($handle, chr(hexdec('1D')).'f'.chr(0)); // note 5
fwrite($handle, chr(hexdec('1D')).'H'.chr(2)); // note 5
fwrite($handle, chr(hexdec('1D')).'h'.chr(60)); // note 5
fwrite($handle, chr(hexdec('1D')).'w'.chr(2)); // note 5
fwrite($handle, chr(hexdec('1D')).'k'.chr(1)); // note 5
fwrite($handle, $barcode.chr(0)); // note 6
fclose($handle); // note 7
}
function upc_e_to_a($barcode) {
$len = strlen($barcode);
if ($len==7 || $len==8) {
$barcode = substr($barcode,1,6); // note 2
}
if (strlen($barcode)!=6) return; //note 3
$upc='';
$last_digit = substr($barcode, -1, 1);
switch ($last_digit) {
case 0:
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Explanation
- Convert the barcode from UPC-E to UPC-A.
- Note that some barcode scanner will produce a 7 or 8 digits when you scan UPC-E barcodes! The first digit is the number system, which is usually 0. The 8th digit, if there's any, is the check digit.
- Double check that the UPC-E contains only 6 digits.
- 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-E barcode printed on the receipt printer! Note that the UPC-A number 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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