Support » Plugins » Use barcode in plugin

  • Resolved little_kostas


    Hello guys,
    i an trying to generate barcodes using the following script: BarcodePHP

    Also, i am creating my plugin using the WordPress Plugin Boilerplate

    Heres my code(inside the public plugin folder):

    class Coupons {
    private function __construct() {
    add_shortcode( 'coupons', array ($this, 'coupons_shortcode') );
    public function coupons_shortcode() {
    // Including all required classes
    // Including the barcode technology
    // Loading Font
    $font = new BCGFontFile('./includes/barcode/font/Arial.ttf', 18);
    // Don't forget to sanitize user inputs
    $text = isset($_GET['text']) ? $_GET['text'] : 'HELLO';
    // The arguments are R, G, B for color.
    $color_black = new BCGColor(0, 0, 0);
    $color_white = new BCGColor(255, 255, 255);
    $drawException = null;
    try {
    	$code = new BCGcode39();
    	$code->setScale(2); // Resolution
    	$code->setThickness(30); // Thickness
    	$code->setForegroundColor($color_black); // Color of bars
    	$code->setBackgroundColor($color_white); // Color of spaces
    	$code->setFont(new BCGFontPhp(5)); // Font (or 0)
    	$code->parse($text); // Text
    } catch(Exception $exception) {
    	$drawException = $exception;
     /* Here is the list of the arguments
    		// 1 - Filename (empty : display on screen)
    		// 2 - Background color */
    	$drawing = new BCGDrawing('', $color_white);
    	if($drawException) {
    	} else {
    // Header that says it is an image (remove it if you save the barcode to a file)
    	header('Content-Type: image/png');
    	header('Content-Disposition: inline; filename="barcode.png"');
    	// Draw (or save) the image into PNG format.

    I am using the [coupons] shortcode inside a page, but when i run the code, i do not get the Barcode, insted i get a message that “The image http://localhost/wordpress/?page_id=2 contains errors”.

    The following code inside the coupons_shortcode, is the same as the example provided by the barcodephp example.

    I am running this code localy, and i have enabled the gd2 library.

    Has anyone tried this before?
    Can you please help me?

    [Moderator Note: No bumping. If it’s that urgent, consider hiring someone.]

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