hackcentercontrol/nodeartnet/node_modules/artnet/lib/artnet_client.js

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JavaScript
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2012-12-28 22:17:47 +00:00
var dgram = require('dgram');
var Buffer = require('buffer').Buffer;
function ArtNetClient(host, port) {
this._host = host;
this._port = port;
this.HEADER = [65, 114, 116, 45, 78, 101, 116, 0, 0, 80, 0, 14]; // 0 - 11
this.SEQUENCE = [0]; // 12
this.PHYSICAL = [0]; // 13
this.UNIVERSE = [0, 0]; // 14 - 15
//this.LENGTH = [0, 13]; // 16 - 17
}
exports.ArtNetClient = ArtNetClient;
exports.createClient = function(host, port) {
return new ArtNetClient(host, port);
}
ArtNetClient.prototype.send = function(data) {
// Calcualte the length
var length_upper = Math.floor(data.length / 256);
var length_lower = data.length % 256;
var data = this.HEADER.concat(this.SEQUENCE).concat(this.PHYSICAL).concat(this.UNIVERSE).concat([length_upper, length_lower]).concat(data);
var buf = Buffer(data);
var sock = dgram.createSocket("udp4");
sock.send(buf, 0, buf.length, this._port, this._host, function() {
sock.close();
});
}