发表更新4 分钟读完 (大约604个字)

tspl打印图片

背景

上一篇文章聊了 nodejs 打印标签， 现在需要增加难度，把图片打印上去

解决方案

参考这篇文章， 作者已经实现了， 但是他的写法已经不支持最新的版本了， 我来翻新一下

新代码

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const usb = require('usb');
const { Jimp, intToRGBA } = require('jimp');
console.log('Jimp is ', Jimp);
const fs = require('fs')
let iconv = require('iconv-lite');

const json = JSON.parse(fs.readFileSync('logo.json', { encoding: 'utf-8' }))
const imgWidthInBytes = json[0].length;
const imgHeightInDots = json.length;


const cmds = [
    'SIZE 48 mm, 10 mm',
    'CLS',
    'TEXT 1,1,"TSS24.BF2",0,1,1,"你好"',
    'PRINT 1',
    'END'
]
// 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',
// ];



async function getImageData(path) {
    const img = await Jimp.read(path)
    const bitmap = img.bitmap
    const widthInBytes = Math.ceil(bitmap.width / 8);
    const data = new Array(bitmap.height);
    for (let y = 0; y < bitmap.height; y++) {
        const row = new Array(widthInBytes);
        for (let b = 0; b < widthInBytes; b++) {
            let byte = 0;
            let mask = 128;
            for (let x = b * 8; x < (b + 1) * 8; x++) {
                const color = intToRGBA(img.getPixelColor(x, y));
                if (color.a < 65) byte = byte ^ mask;
                mask = mask >> 1;
            }
            row[b] = byte;
        }
        data[y] = row;
    }
    return data;
}



function print(cmds) {
    let device = usb.findByIds(1137, 85)

    console.log('cmds is ', cmds);

    device.open();
    device.interfaces[0].claim();
    const outEndpoint = device.interfaces[0].endpoints.find(e => e.direction === 'out');
    outEndpoint.transferType = 2;

    const processedCmds = cmds.map(cmd => {
        if (cmd.startsWith('BITMAP')) {
            return Buffer.from(cmd);
        }
        else if (cmd.startsWith('RAW ')) {
            // 去掉 'HEX ' 前缀并将十六进制字符串转换为 Buffer
            const jsonData = JSON.parse(cmd.slice(4).trim());
            console.log('jsonData is ', jsonData);
            return Buffer.from(jsonData.flat());
        } else {
            // 普通命令按原样处理
            return iconv.encode(cmd + '\r\n', 'gbk');
        }
    });

    outEndpoint.transfer(Buffer.concat(processedCmds), (err) => {
        if (err) {
            console.error('Transfer error:', err);
        }
        device.close();
    })
}


const main = async () => {

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



    print(cmds)

};



async function generateImg() {

    const res = await getImageData('logo-niumag.png')
    console.log('res is ', res);
    fs.writeFileSync('./logo.json', JSON.stringify(res))
}

// generateImg()
main()

老代码

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const usb = require('usb');
const Jimp = require('jimp');

function getImageData(path, cb) {
  Jimp.read(path, (err, img) => {
    const widthInBytes = Math.ceil(img.getWidth() / 8);
    const data = new Array(img.getHeight());
    for (let y = 0; y < img.getHeight(); y++) {
      const row = new Array(widthInBytes);
      for (let b = 0; b < widthInBytes; b++) {
        let byte = 0;
        let mask = 128;
        for (let x = b*8; x < (b+1)*8; x++) {
          const color = Jimp.intToRGBA(img.getPixelColor(x, y));
          if (color.a < 65) byte = byte ^ mask; // empty dot (1)
          mask = mask >> 1;
        }
        row[b] = byte;
      }
      data[y] = row;
    }
    cb(data);
  });
}

function print(buffer) {
  // you can get all available devices with usb.getDeviceList()
  let device = usb.findByIds(/*vid*/8137, /*pid*/8214);
  device.open();
  device.interfaces[0].claim();
  const outEndpoint = device.interfaces[0].endpoints.find(e => e.direction === 'out');
  outEndpoint.transferType = 2;
  outEndpoint.transfer(buffer, (err) => {
    device.close();
  });
}

getImageData('hn-logo.png', (data) => {
  const widthInBytes = data[0].length;
  const heightInDots = data.length;

  const buffer = Buffer.concat([
    Buffer.from('SIZE 48 mm,25 mm\r\n'),
    Buffer.from('CLS\r\n'),
    Buffer.from(`BITMAP 10,20,${widthInBytes},${heightInDots},0,`),
    Buffer.from(data.flat()),
    Buffer.from('BARCODE 10,100,"128",50,1,0,2,2,"altospos.com"\r\n'),
    Buffer.from('PRINT 1\r\n'),
    Buffer.from('END\r\n'),
  ]);
  
  print(buffer);
});

参考图片

1.
hn-logo.png

2.
logo-niumag.png

发表更新3 分钟读完 (大约437个字)

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

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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
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const usb = require('usb');

const list = usb.getDeviceList()
list.forEach(device => {
    console.log(`Device: ${device.deviceDescriptor.idVendor}:${device.deviceDescriptor.idProduct}`);
});
  1. 连接设备
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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();
});
  1. [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 如图

完整代码

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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();
});

链接

分类

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