如何在magento中添加escpos-php？

Question

我正在使用magento 1.9。我想用escpos-php driver把发票打印到U盘热敏打印机上。我将escpos-php库保存在magento安装的根目录中。在magento的一个自定义模块中，我覆盖了默认的发票，当呈现时是A4 pdf，并且我试图制作一个热敏发票pdf (纸张大小C7)。此文件位于/local/Receipt/Pos/Model/Invoice.php

<?php
  class Receipt_Pos_Model_Invoice extends Mage_Sales_Model_Order_Pdf_Invoice
  {
        public function getPdf($invoices = array())
        {
            // I want to access the libraries from here in this 
            // function like shown  below. where 'vendor' is a directory
            // created by myself.
            require(Mage::getBaseDir('lib') .'/vendor/mike42/escpos-php/autoload.php'); // this is the autoloader that comes with escpos-php driver.
            use Mike42\Escpos\PrintConnectors\FilePrintConnector; // Warning is raised at this line.
            use Mike42\Escpos\Printer;
            $connector = new FilePrintConnector("/dev/usb/lp0");
            $printer = new Printer($connector);

         }
    }
   ?>

我现在尝试的是，我想从这个/local/Receipt/Pos/Model/Invoice.php文件访问escpos-php驱动程序的类文件。因此，我将escpos-php驱动程序的自动加载器的绝对路径添加到Invoice.php中的代码中，但它会导致如下所示的警告

Warning: include(Mike42\Escpos\PrintConnectors\PrintConnector.php): failed to open stream: No such file or directory  in /var/www/html/checkout/Gama_V2/shop/lib/Varien/Autoload.php on line 94

I think the autoloader of Magento is also trying to find the class files of the escpos-php driver and fails to load it. But I don't want the magento autoloader work here because, I have already included the autoloader of escpos-php driver which takes care of loading its files. How can I avoid this warning and proceed to print receipts? Please help me!

Answer 1

为了让autoload识别你的外部库，你必须遵循magento文件结构。

外部库通常位于/lib/下

在您的模块中，您可以将它们用作

require_once Mage::getBaseDir('lib') . '/Mike42/Escpos/Whatever.php';