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)

来源：https://segmentfault.com/a/1190000020041317