How to print barcode on invoice PDF?

One of our clients was looking to add the Barcode using OrderIncrement id.

To achieve that I used picqer/php-barcode-generator library in Magento. You can follow the remaining steps only after installing the library.

Step 1: Create a Plugin and define that plugin di.xml. Use the below code and add it to the di.xml file.

<type name="Magento\Sales\Model\Order\Pdf\Invoice">
    <plugin name="barcodes_pdf_invoice" type="Magemonkeys\Barcodes\Plugin\Invoice" sortOrder="10" />
</type>

</type>

Step 2: Create a Invoice.php file under Plugin under this folder “app/code/Magemonkeys/Barcode/Plugin“.

<?php
/**
 * @category Print Barcode On Invoice PDF
 * @package  Magemonkeys_Barcodes
 * @author   Abbacus Team
 */
namespace Magemonkeys\Barcodes\Plugin;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Picqer\Barcode\BarcodeGeneratorPNG;

class Invoice
{
    /**
     * @var ScopeConfigInterface
     */
    private $scopeConfig;
    /**
     * @var \Magento\Sales\Model\Order\Invoice
     */
    private $invoiceModel;
    
    /**
     * 
     * @param ScopeConfigInterface $scopeConfig
     * @param \Magento\Sales\Model\Order\Invoice $invoiceModel
     */
    public function __construct(
        ScopeConfigInterface $scopeConfig,
        \Magento\Sales\Model\Order\Invoice $invoiceModel
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->invoiceModel = $invoiceModel;
    }
    
    /**
     * 
     * @param string $subject
     * @param object $page
     * @param string $text
     */
    public function beforeInsertDocumentNumber($subject, $page, $text)
    {
        $docHeader = $subject->getDocHeaderCoordinates();
        $image = $this->generateBarcode($text);
        $page->drawImage($image, $docHeader[2] - 150, $docHeader[1] + 20, $docHeader[2] , $docHeader[1] +55);
    }
    
    /**
     * 
     * @param string $text
     * @return \Zend_Pdf_Resource_Image_Png
     */
    protected function generateBarcode($text)
    {
        $invoiceIncrement = $this->extractInvoiceNumber($text);
        $invoice = $this->invoiceModel->loadByIncrementId(trim($invoiceIncrement));
        $order = $invoice->getOrder();
        $orderIncrementId = $order->getIncrementId();
        $generator = new BarcodeGeneratorPNG;
        $image = new \Zend_Pdf_Resource_Image_Png('data:image/png;base64,' . base64_encode($generator->getBarcode($orderIncrementId, $generator::TYPE_CODE_128)));
        return $image;
    }
    
    /**
     * 
     * @param string $text
     * @return string
     */
    protected function extractInvoiceNumber($text)
    {
        $array_of_words = explode("#", $text);
        return $array_of_words[1];
    }
}

<?php

/**

* @category Print Barcode On Invoice PDF

* @package Magemonkeys_Barcodes

* @author Abbacus Team

namespace Magemonkeys\Barcodes\Plugin;

use Magento\Framework\App\Config\ScopeConfigInterface;

use Picqer\Barcode\BarcodeGeneratorPNG;

class Invoice

{

/**

* @var ScopeConfigInterface

private $scopeConfig;

/**

* @var \Magento\Sales\Model\Order\Invoice

private $invoiceModel;

/**

* @param ScopeConfigInterface $scopeConfig

* @param \Magento\Sales\Model\Order\Invoice $invoiceModel

public function __construct(

ScopeConfigInterface $scopeConfig,

\Magento\Sales\Model\Order\Invoice $invoiceModel

) {

$this->scopeConfig = $scopeConfig;

$this->invoiceModel = $invoiceModel;

}

/**

* @param string $subject

* @param object $page

* @param string $text

public function beforeInsertDocumentNumber($subject, $page, $text)

{

$docHeader = $subject->getDocHeaderCoordinates();

$image = $this->generateBarcode($text);

$page->drawImage($image, $docHeader[2] - 150, $docHeader[1] + 20, $docHeader[2] , $docHeader[1] +55);

}

/**

* @param string $text

* @return \Zend_Pdf_Resource_Image_Png

protected function generateBarcode($text)

{

$invoiceIncrement = $this->extractInvoiceNumber($text);

$invoice = $this->invoiceModel->loadByIncrementId(trim($invoiceIncrement));

$order = $invoice->getOrder();

$orderIncrementId = $order->getIncrementId();

$generator = new BarcodeGeneratorPNG;

$image = new \Zend_Pdf_Resource_Image_Png('data:image/png;base64,' . base64_encode($generator->getBarcode($orderIncrementId, $generator::TYPE_CODE_128)));

return $image;

}

/**

* @param string $text

* @return string

protected function extractInvoiceNumber($text)

{

$array_of_words = explode("#", $text);

return $array_of_words[1];

}

Now, when you print the Invoice PDF, the barcode will be shown on the top of the PDF. Happy coding. 🙂

Fill the below form if you have any Magento programming need.

Add an image programmatically from any url in Magento 2
[crayon-63e09dffe6308468299553/] Using above fucntion Images can be imported directly from...
Magento 2 : Override the Category view block file
Override view block using di.xml and add the below code...
How to check list of Layout XML called for a specific page in Magento 2?
You can check a list of called layout XML for...
Magento 2 : Setup PWA from Scratch
Follow the below steps to install and set up PWA...
How to remove leading zero’s from the order, invoice and shipment number in Magento 2?
If you want to remove all leading zero's from order,...

Author Info

Hire A. Patel

Let’s have a call

Fill the form & Get Installation Support