nodejs 打印标签

背景

公司有需求， 打印一些小票

1. 直接搜索 node-printer 或者 node-thermal-printer 都太古老了。
2. windows 自带的打印命令 不好调试
3. 这里分享下使用 TSPL指令 在 条码打印机 的一些解决方案

TSPL

示例

SIZE 60 mm,40 mm\r\n
GAP 2 mm\r\n
CLS\r\n
TEXT 50,50,\"4\",0,1,1,\"DEMO FOR TEXT\"\r\n
PRINT 1,1\r\n

文档

https://open.jolimark.com/files/tspl.pdf

步骤

1. 找到设备端口

const usb = require('usb');

const list = usb.getDeviceList()
list.forEach(device => {
    console.log(`Device: ${device.deviceDescriptor.idVendor}:${device.deviceDescriptor.idProduct}`);
});

2. 连接设备

let device = usb.findByIds(1137, 85)
console.log('device is ', device);

device.open();
device.interfaces[0].claim();
const outEndpoint = device.interfaces[0].endpoints.find(e => e.direction === 'out');
outEndpoint.transferType = 2;
outEndpoint.transfer(Buffer.from(cmds.join('\r\n')), (err) => {
  device.close();
});

3. [选填] windows 需要刷新设备的驱动，可以参考 usb 的文档

   On Windows, if you get LIBUSB_ERROR_NOT_SUPPORTED when attempting to open your device, it’s possible your device doesn’t have a WinUSB driver for libusb to use.

   You can install one using Zadig or another approach is to use the UsbDK Backend of libusb by immediately calling usb.useUsbDkBackend().

   Note that you cannot use multiple drivers on Windows as they get exclusive access to the device. So if you want to switch between drivers (e.g. using a printer with this software or the system), you will need to uninstall/install drivers as required.

   For further info, check How to use libusb on Windows in the libusb’s wiki.

刷后的效果

完整代码

const usb = require('usb');

const cmds = [
  'SIZE 48 mm,25 mm',
  'CLS',
  'TEXT 10,10,"4",0,1,1,"HackerNoon"',
  'TEXT 10,40,"4",0,1,1,"amano"',
  'BARCODE 10,100,"128",90,1,0,2,2,"altospos.com"',
  'PRINT 1',
  'END',
];

// you can get all available devices with usb.getDeviceList()
const list = usb.getDeviceList()
console.log('list is ', list);
list.forEach(device => {
  console.log(`Device: ${device.deviceDescriptor.idVendor}:${device.deviceDescriptor.idProduct}`);
});
// let device = list[0]
let device = usb.findByIds(1137, 85)
console.log('device is ', device);

device.open();
device.interfaces[0].claim();
const outEndpoint = device.interfaces[0].endpoints.find(e => e.direction === 'out');
outEndpoint.transferType = 2;
outEndpoint.transfer(Buffer.from(cmds.join('\r\n')), (err) => {
  device.close();
});