jacobq · January 8, 2020 19:42
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <body>
    <h1>Hello World!</h1>
    <!-- All of the Node.js APIs are available in this renderer process. -->
    We are using Node.js <script>document.write(process.versions.node)</script>,
    Chromium <script>document.write(process.versions.chrome)</script>,
    and Electron <script>document.write(process.versions.electron)</script>.

    <script>
      // You can also require other files to run in this process
      require('./renderer.js')
    </script>
  </body>
 </html>
diff --git a/main.js b/main.js
 // Modules to control application life and create native browser window
 const {app, BrowserWindow} = require('electron')

 // 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

 function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      //nodeIntegration: true
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

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

  mainWindow.webContents.once('did-finish-load', async function() {
    const options = {
      /* these can be whatever, but I happened to be using the following
      marginsType: 0,
      pageSize: 'Letter',
      printBackground: true,
      printSelectionOnly: false,
      landscape: false
      */
    };
    console.log('Attempting to print to PDF with options', options)
    try {
      const pdfData = await mainWindow.webContents.printToPDF(options)
      console.log('Got PDF data -->', pdfData) // never gets here
    } catch(e) {
      // output --> Call to printToPDF threw exception [Error: Failed to generate PDF]
      console.error('Call to printToPDF threw exception', e)
    }
  });  

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // 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
  })
 }

 // 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', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
 })

 app.on('activate', function () {
  // 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.
diff --git a/renderer.js b/renderer.js
 // This file is required by the index.html file and will
 // be executed in the renderer process for that window.
 // All of the Node.js APIs are available in this process.
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Hello World!</title>
	</head>
	<body>
	<h1>Hello World!</h1>
	<!-- All of the Node.js APIs are available in this renderer process. -->
	We are using Node.js <script>document.write(process.versions.node)</script>,
	Chromium <script>document.write(process.versions.chrome)</script>,
	and Electron <script>document.write(process.versions.electron)</script>.

	<script>
	// You can also require other files to run in this process
	require('./renderer.js')
	</script>
	</body>
	</html>
	// Modules to control application life and create native browser window
	const {app, BrowserWindow} = require('electron')

	// 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

	function createWindow () {
	// Create the browser window.
	mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	//nodeIntegration: true
	}
	})

	// and load the index.html of the app.
	mainWindow.loadFile('index.html')

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

	mainWindow.webContents.once('did-finish-load', async function() {
	const options = {
	/* these can be whatever, but I happened to be using the following
	marginsType: 0,
	pageSize: 'Letter',
	printBackground: true,
	printSelectionOnly: false,
	landscape: false
	*/
	};
	console.log('Attempting to print to PDF with options', options)
	try {
	const pdfData = await mainWindow.webContents.printToPDF(options)
	console.log('Got PDF data -->', pdfData) // never gets here
	} catch(e) {
	// output --> Call to printToPDF threw exception [Error: Failed to generate PDF]
	console.error('Call to printToPDF threw exception', e)
	}
	});

	// Emitted when the window is closed.
	mainWindow.on('closed', function () {
	// 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
	})
	}

	// 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', function () {
	// On OS X it is common for applications and their menu bar
	// to stay active until the user quits explicitly with Cmd + Q
	if (process.platform !== 'darwin') {
	app.quit()
	}
	})

	app.on('activate', function () {
	// 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.
	// This file is required by the index.html file and will
	// be executed in the renderer process for that window.
	// All of the Node.js APIs are available in this process.