ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Sockets
package
{
import flash.display.Sprite;
import flash.events.DatagramSocketDataEvent;
import flash.events.Event;
import flash.net.DatagramSocket;
import flash.utils.ByteArray;
public class DatagramSocketExample extends Sprite
{
private var datagramSocket:DatagramSocket;
}}
//The IP and port for this computer
private var localIP:String = "192.168.0.1";
private var localPort:int = 55555;
//The IP and port for the target computer
private var targetIP:String = "192.168.0.2";
private var targetPort:int = 55555;
public function DatagramSocketExample()
{
//Create the socket
datagramSocket = new DatagramSocket();
datagramSocket.addEventListener( DatagramSocketDataEvent.DATA, dataReceived );
}
//Bind the socket to the local network interface and port
datagramSocket.bind( localPort, localIP );
//Listen for incoming datagrams
datagramSocket.receive();
//Create a message in a ByteArray
var data:ByteArray = new ByteArray();
data.writeUTFBytes("Hello.");
//Send the datagram message
datagramSocket.send( data, 0, 0, targetIP, targetPort);
private function dataReceived( event:DatagramSocketDataEvent ):void
{
//Read the data from the datagram
trace("Received from " + event.srcAddress + ":" + event.srcPort + "> " +
event.data.readUTFBytes( event.data.bytesAvailable ) );
}
Keep in mind the following considerations when using UDP sockets:
A single packet of data cannot be larger than the smallest maximum transmission unit (MTU) of the network
interface or any network nodes between the sender and the recipient. All of the data in the ByteArray object passed
to the send() method is sent as a single packet. (In TCP, large messages are broken up into separate packets.)
There is no handshaking between the sender and the target. Messages are discarded without error if the target does
not exist or does not have an active listener at the specified port.
Last updated 6/6/2012
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