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September 11, 2018 15:27
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Electron Fiddle Gist
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <canvas></canvas> | |
| <script> | |
| require('./renderer.js') | |
| </script> | |
| </body> | |
| </html> |
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| // Access information about media sources that can be used to capture audio | |
| // and video from the desktop using the navigator.mediaDevices.getUserMedia API. | |
| // | |
| // For more info, see: | |
| // https://electronjs.org/docs/api/desktop-capturer | |
| const { app, BrowserWindow } = require('electron') | |
| let mainWindow = null | |
| app.on('ready', () => { | |
| mainWindow = new BrowserWindow({ height: 800, width: 1200 }) | |
| mainWindow.loadFile('index.html') | |
| }) |
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| const { desktopCapturer, screen } = require('electron') | |
| const displays = screen.getAllDisplays(); | |
| console.log(displays); | |
| const thumbnailSize = displays.reduce((result, { size }) => { | |
| return { | |
| width: size.width > result.width ? size.width : result.width, | |
| height: size.height > result.height ? size.height : result.height, | |
| }; | |
| }, { width: 0, height: 0 }); | |
| console.log(thumbnailSize); | |
| desktopCapturer.getSources({ | |
| types: ['screen'], | |
| thumbnailSize, | |
| }, (error, sources) => { | |
| if (error) throw error; | |
| for (let i = 0; i < sources.length; ++i) { | |
| console.log(sources[i]); | |
| console.log(sources[i].thumbnail.getSize()); | |
| drawImage(sources[i].thumbnail); | |
| break; | |
| } | |
| }) | |
| function drawImage(nativeImage) { | |
| const { width, height } = nativeImage.getSize(); | |
| const canvas = document.querySelector('canvas'); | |
| const context = canvas.getContext('2d'); | |
| const image = new Image(); | |
| canvas.width = width; | |
| canvas.height = height; | |
| image.onload = () => { | |
| context.drawImage(image, 0, 0, width, height); | |
| } | |
| image.src = nativeImage.toDataURL(); | |
| } |
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