electron实现静默打印的示例代码

前言

electron+vuecli3 实现设置打印机，静默打印小票功能

网上相关的资料比较少，这里给大家分享一下，希望大家可以少踩一些坑
github地址

必须要强调一下的是electron的版本必须是3.0.0不能，我尝试了4和5都没有实现

效果图

使用

git clone https://github.com/sunnie1992/electron-vue-print-demo.git
npm install
npm run electron:serve

实现

操作思路
1.用户点击打印
2.查询本地electron-store(用来向本地存储，读取数据)是否存打印机名称
3.已经设置，直接打印
4.没有设置，弹出设置打印机框
5.用户设置好确认后打印

首页App.vue引入了两个组件，一个是主动设置打印机的弹出printDialog

另外一个是打印组件，打印是通过webview将需要打印的内容渲染到html页面然后就能打印了

<template>
 <div id="app">
  <el-button type="primary" @click="showPrint">设置打印机</el-button>
  <printDialog :dialog-visible="dialogVisible" @cancel="handlePrintDialogCancel" />
  <pinter ref="print" :html-data="HtmlData"></pinter>
  <el-table :data="tableData" style="width: 100%">
   <el-table-column prop="date" label="日期" width="180" column-key="date">
   </el-table-column>
   <el-table-column prop="name" label="姓名" width="180">
   </el-table-column>
   <el-table-column prop="address" label="地址">
   </el-table-column>
   <el-table-column label="操作">
    <template slot-scope="scope">
     <el-button type="primary" @click="doPrint(scope.row)">打印</el-button>
    </template>
   </el-table-column>
  </el-table>
 </div>
</template>
<script>
import { ipcRenderer } from 'electron'
import printDialog from './components/PrintDialog.vue'
import Pinter from './components/pinter.vue'
export default {
 name: 'App',
 components: {
  Pinter,
  printDialog
 },
 data() {
  return {
   dialogVisible: false,
   HtmlData: '',
   printList: [],
   tableData: [{
    date: '2016-05-02',
    name: '我是小仙女',
    address: '上海市浦东新区',
    tag: '家'
   }, {
    date: '2016-05-04',
    name: '我是小仙女1',
    address: '上海市浦东新区',
    tag: '公司'
   }, {
    date: '2016-05-01',
    name: '我是小仙女2',
    address: '上海市浦东新区',
    tag: '家'
   }, {
    date: '2016-05-03',
    name: '我是小仙女3',
    address: '上海市浦东新区',
    tag: '公司'
   }]
  }
 },
 mounted() {
 },
 methods: {
  showPrint() {
   this.dialogVisible = true
  },
  handlePrintDialogCancel() {
   this.dialogVisible = false
  },
  doPrint(row) {
   this.HtmlData = row.name
   this.$refs.print.print(row.name)
  }
 }
}
</script>

<style>
#app {
 font-family: 'Avenir', Helvetica, Arial, sans-serif;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
 text-align: center;
 color: #2c3e50;
 margin-top: 60px;
}
</style>

APP.VUE 每次点击打印按钮后触发组件的print方法并将数据传过去 this.$refs.print.print(row.name)
printer.vue 查询打印机，然后调用打印方法printRender。

<template>
 <div class="container">
  <webview id="printWebview" ref="printWebview" :src="fullPath" nodeintegration />
  <printDialog :dialog-visible="dialogVisible" @cancel="handlePrintDialogCancel" @select-print="printSelectAfter" />
 </div>
</template>
<script>
import { ipcRenderer } from 'electron'
import path from 'path'
import printDialog from './PrintDialog.vue'
export default {
 name: 'Pinter',
 components: {
  printDialog
 },
 props: {
  // HtmlData: {
  //  type: String,
  //  default: '',
  // },
 },
 data() {
  return {
   printList: [],
   dialogVisible: false,
   printDeviceName: '',
   fullPath: path.join(__static, 'print.html'),
   messageBox: null,
   htmlData: ''
  }
 },

 mounted() {
  const webview = this.$refs.printWebview
  webview.addEventListener('ipc-message', (event) => {
   if (event.channel === 'webview-print-do') {
    console.log(this.printDeviceName)
    webview.print(
     {
      silent: true,
      printBackground: true,
      deviceName: this.printDeviceName
     },
     (data) => {
      this.messageBox.close()
      if (data) {
       this.$emit('complete')
      } else {
       this.$emit('cancel')
      }
     },
    )
   }
  })
 },
 methods: {
  print(val) {
   this.htmlData = val
   this.getPrintListHandle()
  },
  // 获取打印机列表
  getPrintListHandle() {
   // 改用ipc异步方式获取列表，解决打印列数量多的时候导致卡死的问题
   ipcRenderer.send('getPrinterList')
   ipcRenderer.once('getPrinterList', (event, data) => {
    // 过滤可用打印机
    this.printList = data.filter(element => element.status === 0)
    // 1.判断是否有打印服务
    if (this.printList.length <= 0) {
     this.$message({
      message: '打印服务异常,请尝试重启电脑',
      type: 'error'
     })
     this.$emit('cancel')
    } else {
     this.checkPrinter()
    }
   })
  },
  // 2.判断打印机状态
  checkPrinter() {
   // 本地获取打印机
   const printerName = this.$electronStore.get('printForm') || ''
   const printer = this.printList.find(device => device.name === printerName)
   // 有打印机设备并且状态正常直接打印
   if (printer && printer.status === 0) {
    this.printDeviceName = printerName
    this.printRender()
   } else if (printerName === '') {
    this.$message({
     message: '请先设置其他打印机',
     type: 'error',
     duration: 1000,
     onClose: () => {
      this.dialogVisible = true
     }
    })
    this.$emit('cancel')
   } else {
    this.$message({
     message: '当前打印机不可用,请重新设置',
     type: 'error',
     duration: 1000,
     onClose: () => {
      this.dialogVisible = true
     }
    })

   }
  },

  handlePrintDialogCancel() {
   this.$emit('cancel')
   this.dialogVisible = false
  },
  printSelectAfter(val) {
   this.dialogVisible = false
   this.$electronStore.set('printForm', val.name)
   this.printDeviceName = val.name
   this.printRender()
  },
  printRender(html) {
   this.messageBox = this.$message({
    message: '打印中，请稍后',
    duration: 0
   })
   // 获取<webview>节点
   const webview = this.$refs.printWebview
   // 发送信息到<webview>里的页面
   webview.send('webview-print-render', {
    printName: this.printDeviceName,
    html: this.htmlData
   })
  }
 }
}
</script>
<style scoped>
.container {
 position: fixed;
 right: -500px;
}
</style>

public/print.html渲染webview页面成功后发送打印指令

 <script>
  const { ipcRenderer } = require('electron')
  ipcRenderer.on('webview-print-render', (event, info) => {
   // 执行渲染
   document.getElementById('bd').innerHTML = info.html
   ipcRenderer.sendToHost('webview-print-do')
  })
 </script>
 

这里用到了electron-store存取本地数据

background.js 引入 初始化挂载在global

import ElectronStore from 'electron-store'
// ElectronStore 默认数据
import electronDefaultData from './config/electron-default-data'
let electronStore
app.on('ready', async() => {
 // 初始化配置文件
 electronStore = new ElectronStore({
  defaults: electronDefaultData,
  cwd: app.getPath('userData')
 })
 global.electronStore = electronStore
})

src/plugins/inject.js

注册$electronStore

// eslint-disable-next-line
import { remote } from 'electron'
export default {
 /* eslint no-param-reassign: "error" */
 install(Vue) {
  Vue.prototype.$electronStore = remote.getGlobal('electronStore')
 
 }
}

然后你就可以在vue文件里读取了

this.$electronStore.get('printForm') 和 this.$electronStore.set('printForm', val.name)

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持小牛知识库。