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<?php /** * This file is part of escpos-php: PHP receipt printer library for use with * ESC/POS-compatible thermal and impact printers. * * Copyright (c) 2014-16 Michael Billington < michael.billington@gmail.com >, * incorporating modifications by others. See CONTRIBUTORS.md for a full list. * * This software is distributed under the terms of the MIT license. See LICENSE.md * for details. */ namespace Mike42\Escpos\PrintConnectors; /** * Interface passed to Escpos class for receiving print data. Print connectors * are responsible for transporting this to the actual printer. */ interface PrintConnector { /** * Print connectors should cause a NOTICE if they are deconstructed * when they have not been finalized. */ public function __destruct(); /** * Finish using this print connector (close file, socket, send * accumulated output, etc). */ public function finalize(); /** * Read data from the printer. * * @param string $len Length of data to read. * @return Data read from the printer, or false where reading is not possible. */ public function read($len); /** * Write data to the print connector. * * @param string $data The data to write */ public function write($data); }
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