index.js

const electron = require('electron')
// Module to control application life.
const app = electron.app
// Module to create native browser window.
const BrowserWindow = electron.BrowserWindow

const path = require('path')
const url = require('url')

// special settings
app.commandLine.appendSwitch('ignore-gpu-blacklist', 'true')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

const createWindow = () => {
  // Create the browser window.
  const options = {
    title: require('./package.json').name,
    width: 1200,
    height: 700,
    webgl: true,
    offscreen: true,
    webPreferences: {
      nodeIntegrationInWorker: true
    },
    icon: path.join(__dirname, 'assets/icons/icon.png')
  }
  mainWindow = new BrowserWindow(options)

  // and load the index.html of the app.
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, './index.html'),
    protocol: 'file:',
    slashes: true
  }))

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', () => {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })

  mainWindow.webContents.on('new-window', (event, url) => {
    event.preventDefault()
    require('electron').shell.openExternal(url)
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', () => {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  app.quit()
})

app.on('activate', () => {
  // On OS X 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 (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.
electron.ipcMain.on('get-file-data', (event) => {
  let data = null
  if (process.platform === 'win32' && process.argv.length >= 2) {
    const openFilePath = process.argv[1]
    data = openFilePath
  }
  console.log('here', data, event, process.argv)
  event.sender.send('asynchronous-reply', { data, event, args: process.argv })
  event.returnValue = data
})

electron.ipcMain.on('asynchronous-message', (event, arg) => {
  console.log(arg) // prints "ping"
  event.sender.send('asynchronous-reply', 'pong')
})