electron实现静默打印

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)

关于我

您可以扫描添加下方的微信并备注 Soul 加前端交流群,交流学习。

如果对你有帮助送我一颗小星星(づ ̄3 ̄)づ╭❤~

我来评几句
登录后评论

已发表评论数()

相关站点

热门文章