使用 ipcRenderer 时出现错误（typeerror cannot read properties of undefined (reading 'send')）

Question

我在使用 ipcRenderer 时遇到错误（typeerror 无法读取未定义的属性（读取 'send'））。我觉得错误在 (const mainWindowTemplate) 中，我不知道为什么会弹出这个错误，因为其他时候我使用 ipcRenderer 这从未发生过。我也在 preload.js 中使用 ipcMain.on 时遇到错误。我还看到了由这两个引起的更多错误的屏幕截图。

main.js

const electron = require("electron");
const url  = require("url");
const path = require('path');
const { ipcRenderer } = electron;
const {app , BrowserWindow , Menu , IpcMain} = electron;



require('electron-reloader')(module)

let mainWindow;
let windowForAnswer;


function createWindow(){
    mainWindow = new BrowserWindow({
        title: "Aspire Education",
        titleBarStyle: "hiddenInset",
        webPreferences: {
            nodeIntegration: true,
            contextIsolation: false,
            enableRemoteModule: true,
            preload: path.join(app.getAppPath(), 'preload.js'),
        }
    });
    mainWindow.loadURL(url.format({
        pathname: path.join(__dirname , "mainWindow.html"),
        protocol: 'file:',
        slashes: true
    }))
}

app.on('ready' , function(){
    console.log("ready");
    createWindow();
})

function createWindowQuiz(){
    windowForAnswer = new BrowserWindow({
        title: "Quiz",
        titleBarStyle: "hiddenInset",
        webPreferences: {
            nodeIntegration: true,
            contextIsolation: false,
            enableRemoteModule: true,
            preload: path.join(__dirname, 'mainWindow.js'),
        }
    });
    windowForAnswer.loadURL(url.format({
        pathname: path.join(__dirname , "windowForAnswer.html"),
        protocol: 'file:',
        slashes: true
    }))
    
}



const mainMenuTemplate = [
    {
    label: 'File',
    submenu:[
        {
            label:'Start Quiz',
            click(){
              createWindowQuiz();
              ipcRenderer.send("send-questions")
            }
          },
    ]
      
    }   
]




// Add developer tools option if in dev
if(process.env.NODE_ENV !== 'production'){
    mainMenuTemplate.push({
      label: 'Developer Tools',
      submenu:[
        {
          role: 'reload'
        },
        {
          label: 'Toggle DevTools',
          accelerator:process.platform == 'darwin' ? 'Command+I' : 'Ctrl+I',
          click(item, focusedWindow){
            focusedWindow.toggleDevTools();
          }
        }
      ]
    });
  }

menu = Menu.buildFromTemplate(mainMenuTemplate)
Menu.setApplicationMenu(menu)

preload.js

const electron = require('electron')
const url = require('url')
const path = require('path')
const { ipcMain } = require('electron')
const {app , BrowserWindow} = electron

let questions = []
        function Submit() {
            clicked = true
            let question = document.getElementById('question').value;
            let answer = document.getElementById('answer').value;
            if (question.trim() == "" || answer.trim() == "") {
                alert("Question or answer can't be blank")
            } else {
                console.log(question);
                console.log(answer);
                questions.push(question.trim())
                questions.push(answer.trim())
                console.log(questions)
            }
            document.getElementById('question').value = "";
            document.getElementById('answer').value = "";
            return false;
        }

ipcMain.on('send-questions' , () => {
    console.log("Hello World!")
})

Answer 1

您正试图在预加载脚本中访问 ipcMain。

ipcMain 仅在主进程中可用。

见https://www.electronjs.org/docs/latest/api/ipc-main/

这就是为什么 ipcMain 未定义并且您收到错误无法读取属性 on of undefined 的原因。

您可能正在寻找类似使用 ipcRenderer 向主进程发送消息然后在主进程中使用 ipcMain.on 访问它的方法。

因此在您的预加载脚本中：

ipcRenderer.send('send-questions', {data: questions});

在你的主进程中：

ipcMain.on('send-questions', (msg) => {
    console.log(msg.data);
});

使用 ipcRenderer 时出现错误（typeerror cannot read properties of undefined (reading 'send')）

I am getting an error when using ipcRenderer (typeerror cannot read properties of undefined (reading 'send'))

html

javascript

electron

ipcmain

ipcrenderer