从PHP打印到POS打印机 [英] Printing to POS printer from PHP

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问题描述

我们希望打印到正在运行Apache的POS打印机.由于应用程序的设计和部署，应从服务器进行打印(它应检测到订单并发送到不同的打印机和不同格式的打印...账单，厨房订单等).因此和其他原因(例如从iPad访问应用程序)，我们放弃了诸如QZ-Print applet之类的选项，而无需直接在服务器端进行打印.

我们进行了大量搜索，发现有一个名为php-printer的扩展名，但似乎已经过时，并且只能在Windows下使用.

我们遵循以下代码:(

它可以工作，但是会发送纯文本，我们需要发送图像(徽标)，并格式化更可爱的帐单.我们尝试创建PDF并以相同的方式发送"到打印机，但是只打印空白.

我发现了一个可与网络打印机一起使用的库(github上的escpos-php)，但我们也需要与USB打印机一起使用，以避免我们的客户更换硬件.

一些想法如何实现这一目标?

谢谢.

解决方案

此处 escpos-php 的作者. >

如果您的打印机确实支持ESC/POS(大多数热敏票据打印机似乎使用它的某些子集)，那么我认为驱动程序将适应您的用例:USB或网络打印，徽标，某些格式.其中一些是最近添加的.

USB打印

escpos-php打印到文件指针.在Linux上，您可以使用usblp驱动程序将USB打印机显示为一个文件，然后只需fopen()即可(USB收据示例，

<?php
require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\PrintConnectors\FilePrintConnector;
use Mike42\Escpos\Printer;
$connector = new FilePrintConnector("/dev/usb/lp0");
$printer = new Printer($connector);

$printer -> text("Hello World!\n");
$printer -> cut();

$printer -> close();

或者，更像您当前正在成功使用的代码，您可以写入临时文件并将其复制:

<?php
require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\PrintConnectors\FilePrintConnector;
use Mike42\Escpos\Printer;

/* Open file */
$tmpdir = sys_get_temp_dir();
$file =  tempnam($tmpdir, 'ctk');

/* Do some printing */
$connector = new FilePrintConnector($file);
$printer = new Printer($connector);
$printer -> text("Hello World!\n");
$printer -> cut();

$printer -> close();

/* Copy it over to the printer */
copy($file, "//localhost/KoTickets");
unlink($file);

因此，在您的POS系统中，您将需要一个函数，该函数根据您的客户配置和首选目的地返回文件指针.收据打印机的响应速度非常快，但是如果您有几台iPad在下订单，则应该使用文件锁将操作包装到每台打印机(

对于格式设置， README.md 和下面的示例应该可以帮助您开始.对于大多数收据，您只需要:

  • selectPrintMode()更改字体大小.
  • setEmphasis()切换粗体.
  • setJustification()可使某些文本或图像左对齐或居中.
    • 每次收据后
  • cut().

我还建议您当前使用的示例绘制这样的框:

=========
|       |
=========

您可以使用IBM 代码页437 中的字符，这些字符是为许多受支持的绘图盒而设计的打印机-在输出中仅包含字符0xB3至0xDA.它们并不完美，但是看起来"text" -y少了很多.

$box = "\xda".str_repeat("\xc4", 10)."\xbf\n";
$box .= "\xb3".str_repeat(" ", 10)."\xb3\n";
$box .= "\xc0".str_repeat("\xc4", 10)."\xd9\n";
$printer -> textRaw($box);

完整示例

下面的示例是现在也包含了司机.我认为这看起来像是一种非常典型的商店收据，格式合理，可以很容易地适应您的厨房情况.

扫描输出:

PHP源代码生成它:

<?php
require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\Printer;
use Mike42\Escpos\EscposImage;
use Mike42\Escpos\PrintConnectors\FilePrintConnector;

/* Open the printer; this will change depending on how it is connected */
$connector = new FilePrintConnector("/dev/usb/lp0");
$printer = new Printer($connector);

/* Information for the receipt */
$items = array(
    new item("Example item #1", "4.00"),
    new item("Another thing", "3.50"),
    new item("Something else", "1.00"),
    new item("A final item", "4.45"),
);
$subtotal = new item('Subtotal', '12.95');
$tax = new item('A local tax', '1.30');
$total = new item('Total', '14.25', true);
/* Date is kept the same for testing */
// $date = date('l jS \of F Y h:i:s A');
$date = "Monday 6th of April 2015 02:56:25 PM";

/* Start the printer */
$logo = EscposImage::load("resources/escpos-php.png", false);
$printer = new Printer($connector);

/* Print top logo */
$printer -> setJustification(Printer::JUSTIFY_CENTER);
$printer -> graphics($logo);

/* Name of shop */
$printer -> selectPrintMode(Printer::MODE_DOUBLE_WIDTH);
$printer -> text("ExampleMart Ltd.\n");
$printer -> selectPrintMode();
$printer -> text("Shop No. 42.\n");
$printer -> feed();

/* Title of receipt */
$printer -> setEmphasis(true);
$printer -> text("SALES INVOICE\n");
$printer -> setEmphasis(false);

/* Items */
$printer -> setJustification(Printer::JUSTIFY_LEFT);
$printer -> setEmphasis(true);
$printer -> text(new item('', '$'));
$printer -> setEmphasis(false);
foreach ($items as $item) {
    $printer -> text($item);
}
$printer -> setEmphasis(true);
$printer -> text($subtotal);
$printer -> setEmphasis(false);
$printer -> feed();

/* Tax and total */
$printer -> text($tax);
$printer -> selectPrintMode(Printer::MODE_DOUBLE_WIDTH);
$printer -> text($total);
$printer -> selectPrintMode();

/* Footer */
$printer -> feed(2);
$printer -> setJustification(Printer::JUSTIFY_CENTER);
$printer -> text("Thank you for shopping at ExampleMart\n");
$printer -> text("For trading hours, please visit example.com\n");
$printer -> feed(2);
$printer -> text($date . "\n");

/* Cut the receipt and open the cash drawer */
$printer -> cut();
$printer -> pulse();

$printer -> close();

/* A wrapper to do organise item names & prices into columns */
class item
{
    private $name;
    private $price;
    private $dollarSign;

    public function __construct($name = '', $price = '', $dollarSign = false)
    {
        $this -> name = $name;
        $this -> price = $price;
        $this -> dollarSign = $dollarSign;
    }

    public function __toString()
    {
        $rightCols = 10;
        $leftCols = 38;
        if ($this -> dollarSign) {
            $leftCols = $leftCols / 2 - $rightCols / 2;
        }
        $left = str_pad($this -> name, $leftCols) ;

        $sign = ($this -> dollarSign ? '$ ' : '');
        $right = str_pad($sign . $this -> price, $rightCols, ' ', STR_PAD_LEFT);
        return "$left$right\n";
    }
}

We are looking to print to a POS printer connected where apache is running. Due to design of the application, and deployment, printing should be done from Server (it should detect the order and send to different printers and different formats of printing...bill, kitchen orders, and so on...). For this reason and others (like access application from an iPad for example) we discard options like QZ-Print applet and needst o print directly server side.

We searched a lot, and found that there are an extension called php-printer but seems outdated, and just works under WIndows.

We followed this code: (http://mocopat.wordpress.com/2012/01/18/php-direct-printing-printer-dot-matrix-lx-300/)

$tmpdir = sys_get_temp_dir();   # ambil direktori temporary untuk simpan file.
$file =  tempnam($tmpdir, 'ctk');  # nama file temporary yang akan dicetak
$handle = fopen($file, 'w');
$condensed = Chr(27) . Chr(33) . Chr(4);
$bold1 = Chr(27) . Chr(69);
$bold0 = Chr(27) . Chr(70);
$initialized = chr(27).chr(64);
$condensed1 = chr(15);
$condensed0 = chr(18);
$corte = Chr(27) . Chr(109);
$Data  = $initialized;
$Data .= $condensed1;
$Data .= "==========================\n";
$Data .= "|     ".$bold1."OFIDZ MAJEZTY".$bold0."      |\n";
$Data .= "==========================\n";
$Data .= "Ofidz Majezty is here\n";
$Data .= "We Love PHP Indonesia\n";
$Data .= "We Love PHP Indonesia\n";
$Data .= "We Love PHP Indonesia\n";
$Data .= "We Love PHP Indonesia\n";
$Data .= "We Love PHP Indonesia\n";
$Data .= "--------------------------\n";
$Data .= $corte;
fwrite($handle, $Data);
fclose($handle);
copy($file, "//localhost/KoTickets");  # Lakukan cetak
unlink($file);

And it works, but this sends plain text, and we need to send image (logo), and format a more cute bill. We tried creating a PDF and "sending" to the printer in the same way, but just prints blank.

I found a library to work with network printers (escpos-php on github), but we need to work with USB printers too, to avoid our customers to change hardware.

Some ideas how to achieve this?

Thanks in advance.

解决方案

Author of escpos-php here.

If your printers do support ESC/POS (most thermal receipt printers seem to use some sub-set of it), then I think the driver will accommodate your use case: USB or network printing, logo, some formatting. Some of these are quite recent additions.

USB printing

escpos-php prints to a file pointer. On Linux, you can make the USB printer visible as a a file using the usblp driver, and then just fopen() it (USB receipt example, blog post about installing a USB printer on Linux).

So printing "Hello world" on a USB printer is only slightly different to printing to a networked printer:

<?php
require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\PrintConnectors\FilePrintConnector;
use Mike42\Escpos\Printer;
$connector = new FilePrintConnector("/dev/usb/lp0");
$printer = new Printer($connector);

$printer -> text("Hello World!\n");
$printer -> cut();

$printer -> close();

Or, more like the code you are currently using successfully, you could write to a temp file and copy it:

<?php
require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\PrintConnectors\FilePrintConnector;
use Mike42\Escpos\Printer;

/* Open file */
$tmpdir = sys_get_temp_dir();
$file =  tempnam($tmpdir, 'ctk');

/* Do some printing */
$connector = new FilePrintConnector($file);
$printer = new Printer($connector);
$printer -> text("Hello World!\n");
$printer -> cut();

$printer -> close();

/* Copy it over to the printer */
copy($file, "//localhost/KoTickets");
unlink($file);

So in your POS system, you would need a function which returns a file pointer based on your customer configuration and preferred destination. Receipt printers respond quite quickly, but if you have a few iPads making orders, you should wrap operations to each printer with a file lock (flock()) to avoid concurrency-related trouble.

Also note that USB support on Windows is un-tested.

Logo & Formatting

Once you have figured out how you plan to talk to the printer, you can use the full suite of formatting and image commands.

A logo can be printed from a PNG file like so:

use Mike42\Escpos\EscposImage;
$logo = EscposImage::load("foo.png");
$printer -> graphics($logo);

And for formatting, the README.md and the example below should get you started. For most receipts, you only really need:

  • selectPrintMode() to alter font sizes.
  • setEmphasis() to toggle bold.
  • setJustification() to left-align or center some text or images.
  • cut() after each receipt.

I would also suggest that where you are currently using an example that draws boxes like this:

=========
|       |
=========

You could make use of the characters in IBM Code page 437 which are designed for drawing boxes that are supported by many printers- just include characters 0xB3 to 0xDA in the output. They aren't perfect, but it looks a lot less "text"-y.

$box = "\xda".str_repeat("\xc4", 10)."\xbf\n";
$box .= "\xb3".str_repeat(" ", 10)."\xb3\n";
$box .= "\xc0".str_repeat("\xc4", 10)."\xd9\n";
$printer -> textRaw($box);

Full example

The below example is also now included with the driver. I think it looks like a fairly typical store receipt, formatting-wise, and could be easily adapted to your kitchen scenario.

Scanned output:

PHP source code to generate it:

<?php
require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\Printer;
use Mike42\Escpos\EscposImage;
use Mike42\Escpos\PrintConnectors\FilePrintConnector;

/* Open the printer; this will change depending on how it is connected */
$connector = new FilePrintConnector("/dev/usb/lp0");
$printer = new Printer($connector);

/* Information for the receipt */
$items = array(
    new item("Example item #1", "4.00"),
    new item("Another thing", "3.50"),
    new item("Something else", "1.00"),
    new item("A final item", "4.45"),
);
$subtotal = new item('Subtotal', '12.95');
$tax = new item('A local tax', '1.30');
$total = new item('Total', '14.25', true);
/* Date is kept the same for testing */
// $date = date('l jS \of F Y h:i:s A');
$date = "Monday 6th of April 2015 02:56:25 PM";

/* Start the printer */
$logo = EscposImage::load("resources/escpos-php.png", false);
$printer = new Printer($connector);

/* Print top logo */
$printer -> setJustification(Printer::JUSTIFY_CENTER);
$printer -> graphics($logo);

/* Name of shop */
$printer -> selectPrintMode(Printer::MODE_DOUBLE_WIDTH);
$printer -> text("ExampleMart Ltd.\n");
$printer -> selectPrintMode();
$printer -> text("Shop No. 42.\n");
$printer -> feed();

/* Title of receipt */
$printer -> setEmphasis(true);
$printer -> text("SALES INVOICE\n");
$printer -> setEmphasis(false);

/* Items */
$printer -> setJustification(Printer::JUSTIFY_LEFT);
$printer -> setEmphasis(true);
$printer -> text(new item('', '$'));
$printer -> setEmphasis(false);
foreach ($items as $item) {
    $printer -> text($item);
}
$printer -> setEmphasis(true);
$printer -> text($subtotal);
$printer -> setEmphasis(false);
$printer -> feed();

/* Tax and total */
$printer -> text($tax);
$printer -> selectPrintMode(Printer::MODE_DOUBLE_WIDTH);
$printer -> text($total);
$printer -> selectPrintMode();

/* Footer */
$printer -> feed(2);
$printer -> setJustification(Printer::JUSTIFY_CENTER);
$printer -> text("Thank you for shopping at ExampleMart\n");
$printer -> text("For trading hours, please visit example.com\n");
$printer -> feed(2);
$printer -> text($date . "\n");

/* Cut the receipt and open the cash drawer */
$printer -> cut();
$printer -> pulse();

$printer -> close();

/* A wrapper to do organise item names & prices into columns */
class item
{
    private $name;
    private $price;
    private $dollarSign;

    public function __construct($name = '', $price = '', $dollarSign = false)
    {
        $this -> name = $name;
        $this -> price = $price;
        $this -> dollarSign = $dollarSign;
    }

    public function __toString()
    {
        $rightCols = 10;
        $leftCols = 38;
        if ($this -> dollarSign) {
            $leftCols = $leftCols / 2 - $rightCols / 2;
        }
        $left = str_pad($this -> name, $leftCols) ;

        $sign = ($this -> dollarSign ? '$ ' : '');
        $right = str_pad($sign . $this -> price, $rightCols, ' ', STR_PAD_LEFT);
        return "$left$right\n";
    }
}

这篇关于从PHP打印到POS打印机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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