Magento 1.9 – Change Product Details in Packing Slip Printing

You can customize the invoice layout by modifying this file : Mage_Sales_Model_Order_Pdf_Invoice(app/code/core/Mage/Sales/Model/Order/Pdf/Invoice.php). Of course you need to rewrite the file properly.

Also take a look at these articles for additional info and examples:

1. http://www.atwix.com/magento/customize-magento-pdf-invoice-and-packingslip/
2. http://www.satollo.net/magento-how-to-sligtly-modify-the-invoice-pdf
3. http://www.magentocommerce.com/knowledge-base/entry/custom-pdf-templates/
4. http://www.magentocommerce.com/wiki/5_-_modules_and_development/orders/editing_an_invoice_pdf

I had the same request asked a while back. I used you question and your findings to solve our problem. I am posting in case someone else is in need of a solution.

I am using magento CE 1.9.1

The leg work:
"You never want to edit the core files always create an overwrite" and if you are really good create modules.

1. move "app/code/core/Mage/Core/Model/Email/Template/Mailer.php" to "app/code/**local**/Mage/Core/Model/Email/Template/Mailer.php"

2. move "/app/code/core/Mage/Sales/Model/Order/Shipment.php" to "/app/code/**local**/Mage/Sales/Model/Order/Shipment.php"

Coding:

Mailer.php

1. add a protected variable before the first function declaration
   protected $emailTemplate;

2. Modify the Send function

.

*// comment out this line:*
        // $emailTemplate = Mage::getModel('core/email_template');
*// add these lines:*
        if ($this->emailTemplate)
            $emailTemplate = $this->emailTemplate;
        else
            $emailTemplate = Mage::getModel('core/email_template');

3. Add a function at the bottom of the file before closing the class

.

public function addAttachment($template, Zend_Pdf $pdf, $filename){
 $file = $pdf->render();
        $attachment = $template->getMail()->createAttachment($file);
        if(!is_object($attachment)) return $this;
        $attachment->type = 'application/pdf';
        $attachment->filename = $filename;
        return $this;
 }

Shipment.php

1. below $storeId = $order->getStore()->getId(); add:

.

/* get invoice PDF */
$invoices = $order->getInvoiceCollection();
$pdfInvoice = Mage::getModel('sales/order_pdf_invoice');
$pdf = $pdfInvoice->getPdf($invoices);

2. below $mailer = Mage::getModel('core/email_template_mailer'); add:

.

$mailer->addAttachment($pdf,'invoice.pdf');

I found my answer in Add PDF attachment to invoice email