Question

我正在关注此link的教程（第7步）。我成功地将node.js安装了socket.js，但是当我转到页面并尝试发送图像时，我在服务器上收到此错误

Missing error handler on `socket`.
TypeError: io.sockets.clients is not a function
at Socket.<anonymous> (C:\Users\utente\Projects\webrtc\server.js:30:31)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at Socket.onevent (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\socket.js:330:8)
at Socket.onpacket (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\socket.js:290:12)
at Client.ondecoded (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\client.js:193:14)
at Decoder.Emitter.emit (C:\Users\utente\Projects\webrtc\node_modules\socket.io\node_modules\socket.io-parser\node_modules\component-emitter\index.js:134:20)
at Decoder.add (C:\Users\utente\Projects\webrtc\node_modules\socket.io\node_modules\socket.io-parser\index.js:247:12)
at Client.ondata (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\client.js:175:18)
at emitOne (events.js:77:13)

我的server.js文件是

var os = require('os');
var static = require('node-static');
var http = require('http');
var socketIO = require('socket.io');

var fileServer = new(static.Server)();
var app = http.createServer(function (req, res) {
fileServer.serve(req, res);
}).listen(2013);

var io = socketIO.listen(app);
io.sockets.on('connection', function (socket){

// convenience function to log server messages on the client
function log(){
    var array = [">>> Message from server:"];
    array.push.apply(array, arguments);
    socket.emit('log', array);
}

socket.on('message', function (message) {
    log('Client said:', message);
    // for a real app, would be room only (not broadcast)
    socket.broadcast.emit('message', message);
});

socket.on('create or join', function (room) {
    log('Request to create or join room ' + room);

    var numClients = io.sockets.clients(room).length;
    log('Room ' + room + ' has ' + numClients + ' client(s)');

    if (numClients === 0){
        socket.join(room);
        socket.emit('created', room, socket.id);

    } else if (numClients === 1) {
        socket.join(room);
        socket.emit('joined', room, socket.id);
        io.sockets.in(room).emit('ready');

    } else { // max two clients
        socket.emit('full', room);
    }
});

socket.on('ipaddr', function () {
    var ifaces = os.networkInterfaces();
    for (var dev in ifaces) {
        ifaces[dev].forEach(function (details) {
            if (details.family=='IPv4' && details.address != '127.0.0.1') {
                socket.emit('ipaddr', details.address);
            }
      });
    }
   });

});

index.html是

<!DOCTYPE html>
<html>
<head>
    <meta name="keywords" content="JavaScript, WebRTC" />
    <meta name="description" content="WebRTC codelab" />
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1">

    <title>WebRTC codelab: step X</title>
    <link rel="stylesheet" href="css/main.css">
</head>
<body>
    <h1>WebRTC codelab: step X</h1>

    <p>
        Room URL: <br>
        <code id="url">...</code>
    </p>

    <video class="camera" autoplay></video>
    <div class="controls">
        <canvas id="photo" style="width: 200px; height: 150px; border: 1px solid #ccc;"></canvas>
        <p>
            <button id="snap">snap</button>-then-<button id="send">send</button> 
            <br> - or - <br>
            <button id="snapAndSend">snap & send</button>
        </p>
    </div>

    <div class="incoming">
        <h2>Incoming photos</h2>
        <div id="trail"></div>
    </div>

    <script src="node_modules\socket.io\node_modules\socket.io-client\socket.io.js"></script>
    <script src="js/lib/adapter.js"></script>
    <script src="js/main.js"></script>

</body>

任何帮助？

非常感谢

with io.sockets.clients [room] .length;我解决了错误，但现在我得到了

Missing error handler on `socket`.
TypeError: Cannot read property '8a675bfe1203e' of undefined
at Socket.<anonymous> (C:\Users\utente\Projects\webrtc\server.js:30:38)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at Socket.onevent (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\socket.js:330:8)
at Socket.onpacket (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\socket.js:290:12)
at Client.ondecoded (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\client.js:193:14)
at Decoder.Emitter.emit (C:\Users\utente\Projects\webrtc\node_modules\socket.io\node_modules\socket.io-parser\node_modules\component-emitter\index.js:134:20)
at Decoder.add (C:\Users\utente\Projects\webrtc\node_modules\socket.io\node_modules\socket.io-parser\index.js:247:12)
at Client.ondata (C:\Users\utente\Projects\webrtc\node_modules\socket.io\lib\client.js:175:18)
at emitOne (events.js:77:13)

Answer 1

从日志中说出的错误是在第30行引发的： x2 \in [1,4]

原因是方法var numClients = io.sockets.clients(room).length;不再适用于socket.io v1.0 +

您可以致电：

获取客户列表

io.sockets.clients(room);

Answer 2

您只需将代码行更改为

即可

var numClients = io.sockets.adapter.rooms[room]!=undefined ? Object.keys(io.sockets.adapter.rooms[room]).length:0;

Answer 3

如果您将依赖项更新为最新版本，则会出现此问题：

"dependencies": {
    "mime": "^1.3.4",
    "socket.io": "^1.4.5"
}

虽然它可以使用书中指定的依赖项

"dependencies": {
   "socket.io": "~0.9.6",
    "mime": "~1.2.7"
}

我查看了NodeJs一书中的示例，当然如果你使用最新版本的socket.io它将不起作用，你将有以下两行来使它工作：

自：

var usersInRoom = io.sockets.clients(room);

要：

var usersInRoom = io.of('/').in(room).clients;

和来自：

socket.emit('rooms', io.sockets.manager.rooms);

为：

socket.emit('rooms', io.of('/').adapter.rooms);

问候！

TypeError：io.sockets.clients不是函数

3 个答案: