用于离子 chrom.sockets.udp, 'sockets' of undefined

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 'sockets'。

我打印 chrome 对象没有找到套接字

是什么原因？插件安装不正确？

Answer 1

According to the official sample:... 呃不，这听起来不对。我想你在那里错过了几行代码。（你能为那个样本提供一个 link 吗？）对于套接字，你将不得不 create()、bind()、send() 查看 tests.js here, navigated from您提供的link。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：我的回答是基于我在其他应用程序中对 chrome.sockets.udp 的使用（而不是基于离子的东西...）试试这个代码，看看它是否适合你。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 return 数据。它不是标准的、预先存在的函数。

编辑：为回应您的评论 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 

// 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);
}

用于离子 chrom.sockets.udp, 'sockets' of undefined

Used in the ionic chrom.sockets.udp, 'sockets' of undefined

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