cordova - 用于未定义的ionic chrom.sockets.udp， 'sockets'

Question

我安装了cordova插件:
https://github.com/MobileChromeApps/cordova-plugin-chrome-apps-sockets-udp

根据官方样本:

 chrome.sockets.udp.create({}, function (socketInfo) {
    // The socket is created, now we can send some data
    var socketId = socketInfo.socketId;
    chrome.sockets.udp.send(socketId, arrayBuffer,
      '255.255.255.255', 9999, function (sendInfo) {
        console.log("sent " + sendInfo.bytesSent);
      });
  });

但无法读取未定义的属性“套接字”。

我在打印chrome对象时发现没有套接字

是什么原因插件安装不正确？

Answer 1

According to the official sample:...不好，那听起来不对。我想您在那里错过了几行代码。 (您可以提供该示例的链接吗？)对于套接字，您将不得不create()，bind()，send()查看从您提供的链接导航的tests.js here,。我认为这更有意义:

self = this;  // obviously this is based on how you have the socket "class" defined in JS
chrome.sockets.udp.create({}, function (socketInfo) {
    // The socket is created...
    var socketId = socketInfo.socketId;
    // Setup a listener event handler 
    chrome.sockets.udp.onReceive.addListener(self.onReceive);
    // Bind the socket
    chrome.sockets.udp.bind(socketId, "0.0.0.0", 0, function(result) {
        if (result < 0) {
            console.log("Error binding socket.");
            return;
        }
        // send out a message
        chrome.sockets.udp.send(socketId, arrayBuffer,
            '255.255.255.255', 9999, function (sendInfo) {
                console.log("sent " + sendInfo.bytesSent);
        }); 
        // reminder: 255.255.255.255:9999 is the message destination address
});

请注意:如果基于我在其他应用程序中使用chrome.sockets.udp的响应(而不是基于 ionic 的东西...)，我的响应请尝试以下代码，看看它是否适合您。注意: onReceive(data){..}是我编写的自定义函数，用于解析和使用JavaScript“class”中的返回数据。它不是标准的，预先存在的功能。

编辑:响应您的评论 I already can create, but in when chrome.sockets.udp.send arrayBuffer need what format?，这是我的buffer_converter.js文件

// ref:  https://www.safaribooksonline.com/library/view/programming-chrome-apps/9781491905272/ch04.html
// See also http://stackoverflow.com/questions/29574916/how-to-send-string-over-udp-using-javascript-on-chrome-app

// translate text string to Arrayed buffer
function text2ArrayBuffer(str /* String */ ) {
    var encoder = new TextEncoder('utf-8');
    return encoder.encode(str).buffer;
}

// translate Arrayed buffer to text string
function arrayBuffer2Text(buffer /* ArrayBuffer */ ) {
    var dataView = new DataView(buffer);
    var decoder = new TextDecoder('utf-8');
    return decoder.decode(dataView);
}