通过faye通过websocket发送javascript对象 [英] sending a javascript object through websockets with faye

问题描述

您好，我正在尝试通过websocket发送javascript对象:

faye-websockets文档说:

发送(消息) 接受字符串或缓冲区，并通过连接向另一对等方发送文本或二进制消息.

服务器端，我正在使用node和faye.

var WebSocket = require('faye-websocket');
var http = require('http');

var server = http.createServer();
server.addListener('upgrade', function(request, socket, head) {
    var ws = new WebSocket(request, socket, head);
    ws.send({topic:'handshake', data:'sdf487rgiuh7'});
});
server.listen(8000);

客户端:

<script>
    var ws = new WebSocket('ws://localhost:8000');
    ws.onmessage = function(e) {
        console.log(e.data); //prints [Object object] string and not the object
    };
</script>

我的错误是什么?谢谢

解决方案

WebSockets支持发送和接收:字符串，类型数组(ArrayBuffer)和Blob.发送之前，必须将Javascript对象序列化为上述类型之一.

要以字符串形式发送对象，可以使用内置的JSON支持:

ws.send(JSON.stringify(object));

要将对象作为类型化数组发送，可以使用javascript BSON库，例如此:

ws.send(BSON.serialize(object));

当您收到WebSocket消息时，需要对其进行反序列化.

要从WebSocket消息反序列化JSON字符串，请执行以下操作:

ws.onmessage = function (e) {
    var object = JSON.parse(e.data);
    ...
};

如果通过WebSocket使用二进制消息，那么首先应该设置binaryType属性，以便将所有二进制消息作为类型化数组接收:

ws.binaryType = "arraybuffer";

然后反序列化将如下所示:

ws.onmessage = function (e) {
    var object = BSON.deserialize(e.data);
    ...
};

这是一篇有关在Javascript中使用BSON的博文;

Hi all I'm trying to send a javascript object through websockets:

the faye-websockets documentation says:

send(message) accepts either a String or a Buffer and sends a text or binary message over the connection to the other peer.

server side I'm using node and faye.

var WebSocket = require('faye-websocket');
var http = require('http');

var server = http.createServer();
server.addListener('upgrade', function(request, socket, head) {
    var ws = new WebSocket(request, socket, head);
    ws.send({topic:'handshake', data:'sdf487rgiuh7'});
});
server.listen(8000);

client side:

<script>
    var ws = new WebSocket('ws://localhost:8000');
    ws.onmessage = function(e) {
        console.log(e.data); //prints [Object object] string and not the object
    };
</script>

what is my error? Thanks

解决方案

WebSockets support sending and receiving: strings, typed arrays (ArrayBuffer) and Blobs. Javascript objects must be serialized to one of the above types before sending.

To send an object as a string you can use the builtin JSON support:

ws.send(JSON.stringify(object));

To send an object as a typed array you can use a javascript BSON library such as this one:

ws.send(BSON.serialize(object));

When you receive a WebSocket message you will need to deserialize it.

To deserialize a JSON string from a WebSocket message:

ws.onmessage = function (e) {
    var object = JSON.parse(e.data);
    ...
};

If you are using binary messages over WebSocket, then first you should set the binaryType attribute in order to receive all binary messages as typed arrays:

ws.binaryType = "arraybuffer";

Then the deserialization will look like this:

ws.onmessage = function (e) {
    var object = BSON.deserialize(e.data);
    ...
};

Here is a blog post about using BSON in Javascript;

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