Javascript 回复webContents.send

我的理解是，您不能从呈现的进程回复从主进程发送的事件。 当通信从渲染器进程转到主进程时，可以执行相同的操作：

// Renderer process
ipcRenderer.invoke('some-name', someArgument).then((result) => {
  // ...
})

// Main process
ipcMain.handle('some-name', async (event, someArgument) => {
  const result = await doSomeWork(someArgument)
  return result
})

资料来源：

对于一个简单的撤销/重做，我需要与之相反的方法，这就是我目前使用的方法：

mainProcess.js:

// somewhere in the menu template
{
  id: 'undo',
  label: 'Undo',
  accelerator: 'Command+Z',
  selector: 'undo:',
  click: () => {
    this.mainWindow.webContents.send('undo-request');
  }
},

// down in the main process
ipcMain.on('undo-response', (_event, { canUndo }) => {
  const appMenu = Menu.getApplicationMenu();
  const undoMenuItem = appMenu.getMenuItemById('undo');
  undoMenuItem.enabled = canUndo;
});

ipcRenderer.on('undo-request', () => {
  canvas?.getCommandStack().undo();
  ipcRenderer.send('undo-response', canvas?.getCommandStack().canUnod());
})

renderer.js:

// somewhere in the menu template
{
  id: 'undo',
  label: 'Undo',
  accelerator: 'Command+Z',
  selector: 'undo:',
  click: () => {
    this.mainWindow.webContents.send('undo-request');
  }
},

// down in the main process
ipcMain.on('undo-response', (_event, { canUndo }) => {
  const appMenu = Menu.getApplicationMenu();
  const undoMenuItem = appMenu.getMenuItemById('undo');
  undoMenuItem.enabled = canUndo;
});

ipcRenderer.on('undo-request', () => {
  canvas?.getCommandStack().undo();
  ipcRenderer.send('undo-response', canvas?.getCommandStack().canUnod());
})

如果主进程也可以等待承诺，则不需要额外的

undo响应

事件：

// somewhere in the menu template
{
  id: 'undo',
  label: 'Undo',
  accelerator: 'Command+Z',
  selector: 'undo:',
  click: () => {
    this.mainWindow.webContents.send('undo-request').then(({ canUndo }) => {
      const appMenu = Menu.getApplicationMenu();
      const undoMenuItem = appMenu.getMenuItemById('undo');
      undoMenuItem.enabled = canUndo;
    });
  }
},

---

有没有一种方法可以发送对从主进程发送的事件的某种回复？

以下是一个在主进程和渲染器之间建立通信的简单示例，从主进程启动：

// Renderer process
ipcRenderer.invoke('some-name', someArgument).then((result) => {
  // ...
})

// Main process
ipcMain.handle('some-name', async (event, someArgument) => {
  const result = await doSomeWork(someArgument)
  return result
})

main.js

// check if the window is loaded, before
// sending a data through desired communication channel
mainWindow.webContents.on('did-finish-load', () => {
  // initiate the communication from 
  // the main process through the window object
  mainWindow.webContents.send('ping', 'Message: Ping!');
});

// setup a listener to receive data sent
// through desired communication channel
// expect the data from the renderer
ipcMain.on('pong', (event, arg) => {
  console.log(arg); // prints -> Message: Pong!
});

// setup a listener to receive data sent
// through desired communication channel
// expect the data from the main process
ipcRenderer.on('ping', (event, arg) => {
  console.log(arg); // prints -> Message: Ping!
  // send back a reply to the main process
  event.sender.send('pong', 'Message: Pong!');
});

renderer.js

// check if the window is loaded, before
// sending a data through desired communication channel
mainWindow.webContents.on('did-finish-load', () => {
  // initiate the communication from 
  // the main process through the window object
  mainWindow.webContents.send('ping', 'Message: Ping!');
});

// setup a listener to receive data sent
// through desired communication channel
// expect the data from the renderer
ipcMain.on('pong', (event, arg) => {
  console.log(arg); // prints -> Message: Pong!
});

// setup a listener to receive data sent
// through desired communication channel
// expect the data from the main process
ipcRenderer.on('ping', (event, arg) => {
  console.log(arg); // prints -> Message: Ping!
  // send back a reply to the main process
  event.sender.send('pong', 'Message: Pong!');
});

电子样板文件：

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我认为这目前是不可能的。我对我的应用程序也有同样的需求，但最终还是像你一样/你好！欢迎来到堆栈溢出！请更新您的答案，并解释上面的代码为什么以及如何回答问题？仅从代码中不清楚。@user230910谢谢。我希望这次更新能解开乒乓球背后的谜团。这不正是我现在正在做的吗？