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electron-mainWindow-capture
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <video style="display:none;" height="900"></video> | |
| <canvas id="screenshot-canvas" style="display:none"></canvas> | |
| <img id="screenshot-img" style="display:none"/> | |
| </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,desktopCapturer ,screen } = require('electron') | |
| const path = require('path') | |
| let mainWindow | |
| app.whenReady().then(() => { | |
| mainWindow = new BrowserWindow({ | |
| height: 600, | |
| width: 600, | |
| webPreferences: { | |
| nodeIntegration: false, // default in Electron >= 5 | |
| contextIsolation: true, // default in Electron >= 12 | |
| preload: path.join(__dirname, 'preload.js') | |
| } | |
| }) | |
| mainWindow.loadFile('index.html') | |
| mainWindow.webContents.openDevTools({ mode: 'detach' }) | |
| setTimeout(startCapture,1000) | |
| }) | |
| function startCapture () { | |
| let allDisp = screen.getAllDisplays() | |
| desktopCapturer.getSources({ types: ['screen'] }).then(async sources => { | |
| for (const source of sources) { | |
| allDisp.forEach((sc,k)=>{ | |
| if(source.display_id == sc.id) { | |
| mainWindow.webContents.send('SET_SOURCE', source.id,sc.scaleFactor,sc.size) | |
| } | |
| }) | |
| } | |
| }) | |
| } |
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| { | |
| "name": "deserted-motion-diagnose-g6mmj", | |
| "productName": "deserted-motion-diagnose-g6mmj", | |
| "description": "My Electron application description", | |
| "keywords": [], | |
| "main": "./main.js", | |
| "version": "1.0.0", | |
| "author": "terry", | |
| "scripts": { | |
| "start": "electron ." | |
| }, | |
| "dependencies": {}, | |
| "devDependencies": { | |
| "electron": "17.0.0" | |
| } | |
| } |
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| const { ipcRenderer } = require('electron') | |
| ipcRenderer.on('SET_SOURCE', async (event, sourceId,scaleFactor,size) => { | |
| try { | |
| const stream = await navigator.mediaDevices.getUserMedia({ | |
| audio: false, | |
| video: { | |
| mandatory: { | |
| chromeMediaSource: 'desktop', | |
| chromeMediaSourceId: sourceId, | |
| minWidth: 1280, | |
| maxWidth: 10000, | |
| minHeight: 720, | |
| maxHeight: 4000 | |
| } | |
| } | |
| }) | |
| handleStream(stream,scaleFactor,size) | |
| } catch (e) { | |
| handleError(e) | |
| } | |
| }) | |
| function handleStream (stream,scaleFactor,size) { | |
| const video = document.querySelector('video') | |
| video.srcObject = stream | |
| video.onloadedmetadata = function(e) | |
| { | |
| video.play() | |
| console.log('video.size',this.videoWidth,this.videoHeight) | |
| var canvas = document.getElementById('screenshot-canvas') | |
| canvas.width = this.videoWidth | |
| canvas.height = this.videoHeight | |
| var ctx = canvas.getContext('2d') | |
| ctx.drawImage(video,0,0,canvas.width,canvas.height) | |
| video.remove() | |
| document.getElementById('screenshot-img').src = canvas.toDataURL("image/png") | |
| document.getElementById('screenshot-img').style.display = "block" | |
| console.log('screen-size,scaleFactor',size,scaleFactor) | |
| console.log('screenshot-img:size:', | |
| canvas.width, | |
| canvas.height) | |
| } | |
| } | |
| function handleError (e) { | |
| console.log(e) | |
| } |
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