打印electron

import { app, protocol, BrowserWindow, Menu, globalShortcut, ipcMain } from 'electron'
import { createProtocol } from 'vue-cli-plugin-electron-builder/lib'
import installExtension, { VUEJS_DEVTOOLS } from 'electron-devtools-installer'
const isDevelopment = process.env.NODE_ENV !== 'production'

// Scheme must be registered before the app is ready
protocol.registerSchemesAsPrivileged([
  { scheme: 'app', privileges: { secure: true, standard: true } }
])

let defaultWinow = null
let printWindow = null

async function createWindow() {
  // Create the browser window.
  const win = new BrowserWindow({
    width: 1920,
    height: 1080,
    frame: false,
    webPreferences: {
      
      // Use pluginOptions.nodeIntegration, leave this alone
      // See nklayman.github.io/vue-cli-plugin-electron-builder/guide/security.html#node-integration for more info
      nodeIntegration: true,
      contextIsolation: false,
      enableRemoteModule: true,
      webviewTag: true
    },
    resizable: false
  })
  
  defaultWinow = win
  
  Menu.setApplicationMenu(null)

  if (process.env.WEBPACK_DEV_SERVER_URL) {
    // Load the url of the dev server if in development mode
    await defaultWinow.loadURL(process.env.WEBPACK_DEV_SERVER_URL)
    if (!process.env.IS_TEST) win.webContents.openDevTools()
  } else {
    createProtocol('app')
    // Load the index.html when not in development
    defaultWinow.loadURL('app://./index.html')
  }
  
  globalShortcut.register('F11', () => {
    if (defaultWinow.isFullScreen()) {
      defaultWinow.setFullScreen(false);
    } else {
      defaultWinow.setFullScreen(true);
    }
  });
  
  ipcMain.on('get-printer-list', (event) => {
    const list = win.webContents.getPrinters();
    //通过webContents发送事件到渲染线程，同时将打印机列表也传过去
    defaultWinow.webContents.send('get-printer-list', list);
  });
}

// Quit when all windows are closed.
app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', () => {
  // On macOS it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (BrowserWindow.getAllWindows().length === 0) createWindow()
})

app.on('ready', async () => {
  if (isDevelopment && !process.env.IS_TEST) {
    // Install Vue Devtools
    try {
      // await installExtension(VUEJS_DEVTOOLS)
      const { default: installExtension } = await import('electron-devtools-installer')
      var vue_devtools_beta = { id: "ljjemllljcmogpfapbkkighbhhppjdbg", electron: ">=1.2.1" }
      var result = await installExtension(vue_devtools_beta)
      if (result) {
        console.log("success load : " + result)
      }
    } catch (e) {
      console.error('Vue Devtools failed to install:', e.toString())
    }
  }
  createWindow()
  createPrintWindow()
})

if (isDevelopment) {
  if (process.platform === 'win32') {
    process.on('message', (data) => {
      if (data === 'graceful-exit') {
        app.quit()
      }
    })
  } else {
    process.on('SIGTERM', () => {
      app.quit()
    })
  }
}


const createPrintWindow = () => {
  const _printWindow = new BrowserWindow({
    show: false,
    title: '打印页面',
    width: 800,
    height: 600,

  })

  printWindow = _printWindow
  ipcMain.on('startPrint', async (event, { deviceName, data }) => {
    printWindow.loadURL(`data:text/html;charset=utf-8, ${encodeURI(data.html)}`)
    printWindow.webContents.once('did-finish-load', () => {
      printWindow.webContents.print({
        silent: true,
        printBackground: false,
        deviceName: deviceName
      }, res => {
      });
    })
  })
}