so I have been having real trouble sending binary data with socket.io in node.js (Js client and Android client).
There is not much information neither in:
http://socket.io/blog/introducing-socket-io-1-0/
http://socket.io/get-started/chat/
I need to use socket io to send a binary array, that I create and fill.
the only code they give is the following:
var socket = new WebSocket('ws://localhost');
socket.binaryType = 'arraybuffer';
socket.send(new ArrayBuffer);
My answer is bellow.
Finally I have it working with JS and Android ( Java ), so I decided to share it with you guys.
Let's start with the Server Code: (Node js)
var http = require('http');
var app = http.createServer(function ejecute(request, response){});
var io = require('socket.io').listen(app);
io.on('connection', function(socket) {
socket.on('message', function(data){
console.log("recieved data:");
console.log(data);
var bufArr = new ArrayBuffer(4);
var bufView = new Uint8Array(bufArr);
bufView[0]=6;
bufView[1]=7;
bufView[2]=8;
bufView[3]=9;
socket.emit('message',bufArr);
});
});
app.listen(3000);
Lets jump on to the Javascript client
var socket = io("http://localhost:3000");
socket.emit('message', 'hola from js client');
socket.on('message', function(msg){
var bufView = new Uint8Array(msg);
console.log(msg)
});
And finally, let's show the Android (java) client:
final Socket socket = IO.socket("http://localhost:3000",opts);
socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {
@Override
public void call(Object... args) {
socket.emit("message","hello from java");
}
});
socket.on("message", new Emitter.Listener() {
@Override
public void call(Object... args) {
byte[] bytearray = (byte[])args[0]; //received bytes
for (byte b : bytearray) {
System.out.println("byte"+b);
}
}
});
socket.on(Socket.EVENT_DISCONNECT, new Emitter.Listener() {
@Override
public void call(Object... args) {}
});
I hope it is useful to you all. Cheers!
