我正在试验用于构建桌面应用程序的Electron(atom shell)平台,目前在mac os x上。
我正在尝试其IPC(进程间通信)模块,用于在两个主要电子进程,主要进程和渲染器进程之间发送和接收同步和异步消息。
然而,对于异步消息,我得到的消息的回复超过了从渲染器进程发送到主进程的消息,在那里他们被回复。我知道这种形式的控制台输出主进程应该产生的回复。
对于DOM的2个组件中的每一个,我向主进程发送1条单个消息,并以回复的方式响应,并记录到控制台。但是对于2个组件(反应组件),我获得了4个控制台日志行,3个是9个,而4个是16个控制台日志消息行。
这里发生了什么?我对缺少关于异步消息和IPC回复的看法是什么?同步消息和回复没问题。
main.js(主要流程代码):
var app = require('app'); // Module to control application life.
var BrowserWindow = require('browser-window'); // Module to create native browser window.
var ipc = require('ipc');
// Report crashes to our server.
require('crash-reporter').start();
// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is GCed.
var mainAppWindow = null;
var bookWindow = null;
// Quit when all windows are closed.
app.on('window-all-closed', function() {
// On OS X it is common for applications and their menu bar
// to stay active until the user quits explicitly with Cmd + Q
app.quit();
});
// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
app.on('ready', function() {
// Create the browser window.
mainAppWindow = new BrowserWindow({width: 1200, height: 900, 'title-bar-style': 'hidden'});
// and load the index.html of the app.
mainAppWindow.loadUrl('file://' + __dirname + '/index.html');
mainAppWindow.openDevTools();
// Emitted when the window is closed.
mainAppWindow.on('closed', function() {
// Dereference the window object, usually you would store windows
// in an array if your app supports multi windows, this is the time
// when you should delete the corresponding element.
mainAppWindow = null;
app.quit();
});
ipc.on('asynchronous-message', function(event, arg) {
console.log(arg); // prints "ping"
event.sender.send('asynchronous-reply', 'pong');
});
// listen for the messages from renderer process to close the mainwindow and open a readerwindow
ipc.on('synchronous-message', function(event, arg) {
console.log(arg); // prints "ping"
event.returnValue = 'pong';
});
// when all of the book reader windows are closed open the mainAppWindow
// in main process listen for all bookreaderwindows are closed
// and in each, checking an array of them formed when they are each created.
});
index.js(渲染器进程代码):
/*
-mainApp
-Controls
-Books
-Book
*/
var ipc = require('ipc');
var Book = React.createClass({
switchToBookReader: function() {
// close mainAppWindow, and open bookreader window.
// send message to main process 'close window'.
// listen in main process for this.
// callback for this in main process is to close the main window and open a readerwindow
},
componentDidMount: function() {
ipc.send('asynchronous-message', 'ping');
ipc.on('asynchronous-reply', function(arg) {
console.log(arg); // prints "pong"
});
console.log(ipc.sendSync('synchronous-message', 'ping')); // prints "pong"
},
render: function() {
return (
<div onDoubleClick={this.switchToBookReader()} >
{this.props.name}
</div>
);
}
});
var Books = React.createClass({
render: function() {
// create Book nodes here.
var bookNodes = [];
bookNodes.push(<Book name="book1"/>);
bookNodes.push(<Book name="book2"/>);
return (
<div>
{bookNodes}
</div>
);
}
});
var Controls = React.createClass({
render: function() {
return (
<div>
Controls
</div>
);
}
});
var mainApp = React.createClass({
render: function() {
return (
<div>
<Controls />
<Books />
</div>
);
}
});
React.render(<mainApp />, document.body);
答案 0 :(得分:1)
每个侦听器都会创建一个在创建侦听器时返回的唯一ID。基于此,删除侦听器可以这样做:
ipcRenderer.once(channel, listener);
为事件添加一次性侦听器功能。只有在下次将消息发送到通道时才会调用此侦听器,之后将其删除。
访问https://electron.atom.io/docs/api/ipc-renderer/#ipcrendereroncechannel-listener
在这里得到解决方案并且正在努力。