双向IPC的一个常见应用：从渲染器进程代码调用主进程模块并等待结果
【ipcRenderer.invoke】《==============》【ipcMain.handle()】
main.js
const { app, BrowserWindow, ipcMain, dialog } = require('electron/main')
const path = require('node:path')async function handleFileOpen () {const { canceled, filePaths } = await dialog.showOpenDialog()if (!canceled) {return filePaths[0]}
}function createWindow () {const mainWindow = new BrowserWindow({webPreferences: {preload: path.join(__dirname, 'preload.js')}})mainWindow.loadFile('index.html')
}app.whenReady().then(() => {ipcMain.handle('dialog:openFile', handleFileOpen)createWindow()app.on('activate', function () {if (BrowserWindow.getAllWindows().length === 0) createWindow()})
})app.on('window-all-closed', function () {if (process.platform !== 'darwin') app.quit()
})preload.js
const { contextBridge, ipcRenderer } = require('electron/renderer')contextBridge.exposeInMainWorld('electronAPI', {openFile: () => ipcRenderer.invoke('dialog:openFile')
})renderer.js
const btn = document.getElementById('btn')
const filePathElement = document.getElementById('filePath')btn.addEventListener('click', async () => {const filePath = await window.electronAPI.openFile()filePathElement.innerText = filePath
})
index.html
<!DOCTYPE html>
<html><head><meta charset="UTF-8"><!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP --><meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'"><title>Dialog</title></head><body><button type="button" id="btn">Open a File</button>File path: <strong id="filePath"></strong><script src='./renderer.js'></script></body>
</html>
