desktopCapturer: 用于桌面捕获音频和视频等媒体源信息，只在主进程可用，下面的例子显示了获取整个屏幕的地址图片

// main.js 主进程const getSource = mainWindow => {ipcMain.handle('desktop-capturer', async (event) => {return desktopCapturer.getSources({types: ['window', 'screen'],// thumbnailSize: {//     width: 1728,//     height: 1117// }}).then(async (sources) => {console.log(sources, '主进程');return sources // for(const source of sources) {//     if (source.name === 'Entire Screen') {//         mainWindow.webContents.send('SET_SOURCE', source)//     }// }})})
}app.whenReady().then(() => {getSource();
})

// preload.js, 通过预加载进程， 向渲染进程传递地址然后显示出来const {desktopCapturer, contextBridge, ipcRenderer} = require('electron')const capture = async mainWindow => {const sources = await ipcRenderer.invoke('desktop-capturer')console.log(sources, 'sources');for(const source of sources) {if (source.name === 'Entire Screen' || source.name === '整个屏幕') {// mainWindow.webContents.send('SET_SOURCE', source)// 取资源let str = source.thumbnail.crop({x: 0, y: 30, width: 1200, height: 1170})const imgSrc = str.toDataURL()return imgSrc }}
}contextBridge.exposeInMainWorld('AAA', {capture
})

// sources资源的输出结果