我正在学习Electron和更多的 Node ，但是每次与IPC Renderer交互时，我总是遇到错误。
render.js:6 Uncaught ReferenceError: Cannot access 'ipc' before initialization
at updateRP (render.js:6)
at HTMLButtonElement.onclick (index.html:11)
CODE:
的HTML
<html>
<head>
<meta charset="UTF-8">
<title>Hello World!</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<h1>💖 Hello World!</h1>
<p>Welcome to your Electron application.</p>
<button onclick="updateRP()">Update RP</button>
<script type="text/javascript" src="render.js"></script>
</body>
</html>
const { app, BrowserWindow } = require('electron');
const { ipcMain } = require('electron');
const ipc = require('electron').ipcMain;
const path = require('path');
const client = require('discord-rich-presence')('745419354375454901');
client.updatePresence({
state: 'slithering',
details: '🐍',
startTimestamp: Date.now(),
endTimestamp: Date.now() + 1337,
largeImageKey: 'snek_large',
smallImageKey: 'snek_small',
instance: true,
});
// Handle creating/removing shortcuts on Windows when installing/uninstalling.
if (require('electron-squirrel-startup')) { // eslint-disable-line global-require
app.quit();
}
const createWindow = () => {
// Create the browser window.
const mainWindow = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
nodeIntegration: true
}
});
// and load the index.html of the app.
mainWindow.loadFile(path.join(__dirname, 'index.html'));
// Open the DevTools.
};
// 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, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', () => {
if (process.platform !== 'darwin') {
app.quit();
}
});
app.on('activate', () => {
// 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 (BrowserWindow.getAllWindows().length === 0) {
createWindow();
}
});
ipcMain.on("UpdateRP", stateForRP =>{
client.updatePresence({
state: stateForRP,
details: 'test',
startTimestamp: Date.now(),
endTimestamp: Date.now() + 1337,
largeImageKey: 'logo',
smallImageKey: 'profilepic',
instance: true,
});
});
const {ipcRenderer} = require('electron')
const ipc = electron.ipcRenderer;
function updateRP(){
var stateForRP = "Test";
ipc.send("UpdateRP", stateForRP);
}
最佳答案
至少可以说，在提供的代码中，由require ('electron')返回的对象的destructuring assignment的处理方式很奇怪。
在渲染器中:
const {ipcRenderer} = require('electron')
const ipc = electron.ipcRenderer; // The variable *electron* has never been defined!
const electron = require('electron');
const ipc = electron.ipcRenderer;
const { ipcRenderer } = require('electron');
const ipc = ipcRenderer;
const { ipcRenderer: ipc } = require('electron');
const { app, BrowserWindow } = require('electron');
const { ipcMain } = require('electron');
const ipc = require('electron').ipcMain;
const { app, BrowserWindow, ipcMain } = require('electron');
const ipc = ipcMain;
const { app, BrowserWindow, ipcMain: ipc } = require('electron');
我刚刚在主流程代码中注意到了另一个潜在问题:
mainWindow变量必须是全局变量，这样它的值才不会被垃圾收集...看到这个post。
代替:
const createWindow = () => {
// Create the browser window.
const mainWindow = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
nodeIntegration: true
}
});
// and load the index.html of the app.
mainWindow.loadFile(path.join(__dirname, 'index.html'));
// Open the DevTools.
};
let mainWindow;
const 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(path.join(__dirname, 'index.html'));
// Open the DevTools.
};
关于javascript - 渲染过程中IPCRenderer的 Electron 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63825332/