将同步消息从 IpcMain 发送到 IpcRenderer - Electron [英] Send sync message from IpcMain to IpcRenderer - Electron

问题描述

在 electron 中，可以通过 ipcRenderer 将同步消息从 IpcRenderer 发送到 IpcMain.sendSync('同步消息', 'ping').

还可以使用 window.webContents.send('ping', 'whooooooooh!') 将 async 消息从 IpcMain 发送到 IpcRenderer

但是有什么方法可以将 sync 消息从 IpcMain 发送到 IpcRenderer?

解决方案

ipcMain ^*没有这个功能.但是，您可以通过以下步骤异步获得几乎相同的结果:

• 将仅在同步调用之后运行的代码放在 ipcMain 回调中.
• 使用 event.sender.send
在渲染器进程中使用结果回复 ipc 消息

使用这种方法的 sum 虚拟示例如下所示:

main.js

const {app, BrowserWindow, ipcMain} = require('electron')常量路径 = 要求('路径')app.once('准备好了', () => {让 win = new BrowserWindow()//必须运行同步"，即只有在结果准备好之后const doJobWithResult = (res) =>{控制台.log(res)}win.webContents.once('dom-ready', () => {win.web 内容.send('求和请求', 23, 98, 3, 61)ipcMain.once('sum-reply', (event, sum) => {doJobWithResult(sum)})})win.loadURL(path.resolve(__dirname, 'test.html'))})

renderer.js(引用自 test.html)

const {ipcRenderer} = require('electron')window.onload = () =>{const add = (a, b) =>{返回 a + b}ipcRenderer.on('sum-request', (event, ...args) => {event.sender.send('sum-reply', [...args].reduce(add, 0))})}

<小时>

_{* 我想这是因为从 main 同步调用到渲染器会阻塞主 nodejs 进程，毕竟它也服务于渲染器进程.}

In electron, It is possible to send sync message from IpcRenderer to IpcMain via ipcRenderer.sendSync('synchronous-message', 'ping').

Also possible to send async message from IpcMain to IpcRenderer using window.webContents.send('ping', 'whoooooooh!')

but is there any way to send sync message from IpcMain to IpcRenderer?

解决方案

There is no such functionality of ipcMain ^*. However, you can achieve almost the same result asynchronously with the following steps:

• Place your code which you would run only after the synchronous call in an ipcMain callback.
• Reply to ipc message in renderer process with the result using event.sender.send

A dummy example of sum using this approach looks like the following:

main.js

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

app.once('ready', () => {
  let win = new BrowserWindow()
  // have to run "sync", that is only after result is ready
  const doJobWithResult = (res) => {
    console.log(res)
  }
  win.webContents.once('dom-ready', () => {
    win.webContents
    .send('sum-request', 23, 98, 3, 61)
    ipcMain.once('sum-reply', (event, sum) => {
      doJobWithResult(sum)
    })
  })
  win.loadURL(path.resolve(__dirname, 'test.html'))
})

renderer.js (referred from test.html)

const {ipcRenderer} = require('electron')

window.onload = () => {
  const add = (a, b) => {
    return a + b
  }
  ipcRenderer.on('sum-request', (event, ...args) => {
    event.sender.send('sum-reply', [...args].reduce(add, 0))
  })
}

---

_{* I suppose it's because calling synchronously from main to renderer would block the main nodejs process which does serve renderer processes too after all.}

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