XMLSocket Issue

Question

HI,
I have written a small program which uses XMLSocket to
communicate with some server.
It works for the first time, I mean when i send first
message, I got the response from server but after that flex client
does not send any message to server and i see no exception in the
code.
can anybody pls. help ?
Following is the code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" width="800" height="600">
<mx:TraceTarget level="0" />
<mx:Script>
<![CDATA[
import asclasses.SocketComm;
import flash.system.Security;
import asclasses.ACTURLLoader;
import mx.controls.Alert;
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import mx.rpc.http.HTTPService;
private var response:String;
private var socketComm:SocketComm;
private var sock:XMLSocket;
private var isSocketConnected:Boolean = false;
private function handleTest():void {
// Printing Sandbox
var sandbox:String = Security.sandboxType;
sandboxType.text = sandbox;
if(!isSocketConnected) {
// Local Windows Service
var host:String = winServiceHost.text;
var port:String = winServicePort.text;
socketComm = new SocketComm();
sock = socketComm.createSocketConnection(host, int(port));
configureSocketListeners(sock);
}else {
Alert.show("Entered in else part");
if(sock.connected) {
Alert.show("socket is connected");
try {
sock.send(msg.text+"\n");
}catch(ie:IOError) {
Alert.show(ie.toString());
}else {
Alert.show("sock is not conected");
private function
configureSocketListeners(dispatcher:IEventDispatcher):void {
dispatcher.addEventListener(Event.CLOSE, socketHandler);
dispatcher.addEventListener(Event.CONNECT, socketHandler);
dispatcher.addEventListener(DataEvent.DATA, socketHandler);
dispatcher.addEventListener(ErrorEvent.ERROR,
socketHandler);
dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR,
socketHandler);
dispatcher.addEventListener(IOErrorEvent.IO_ERROR,
socketHandler);
dispatcher.addEventListener(ProgressEvent.SOCKET_DATA,
socketHandler);
private function socketHandler(event:Event):void {
var socket:XMLSocket = XMLSocket(event.target);
Alert.show(event.toString());
trace(event.toString());
if(event.type == Event.CLOSE) {
winServiceContent.text = response;
}else if(event.type == SecurityErrorEvent.SECURITY_ERROR) {
socket.close();
}else if(event.type == IOErrorEvent.IO_ERROR) {
socket.close();
}else if(event.type == DataEvent.DATA) {
winServiceContent.text += DataEvent(event).data;
}else if(event.type == Event.CONNECT) {
// Sending first msg
Alert.show("Sending Message : " + msg.text);
socket.send(msg.text+"\n");
isSocketConnected = true;
}else if(event.type == ProgressEvent.SOCKET_DATA) {
trace("progressHandler loaded:" +
ProgressEvent(event).bytesLoaded + " total: " +
ProgressEvent(event).bytesTotal);
]]>
</mx:Script>
<mx:Form id="fff" x="36" y="10" width="500"
height="414">
<mx:FormHeading label="Security Test Form"/>
<mx:FormItem label="Sandbox Type">
<mx:Text id="sandboxType"/>
</mx:FormItem>
<mx:FormItem label="Windows Service Host">
<mx:TextInput id="winServiceHost"
text="10.201.205.196"/>
</mx:FormItem>
<mx:FormItem label="Windows Service Port">
<mx:TextInput id="winServicePort" text="8081"/>
</mx:FormItem>
<mx:FormItem label="Command Message">
<mx:TextInput id="msg" />
</mx:FormItem>
<mx:FormItem label="Windows Service Content">
<mx:TextArea id="winServiceContent"/>
</mx:FormItem>
</mx:Form>
<mx:Button label="Test" click="handleTest()" x="54"
y="452"/>
<mx:Button label="Clear" x="132" y="452" />
</mx:Application>

Answer 1

Hi Tracy,
Thanks for your reply.
SocketComm is a action script class which maintains XMLSocket
object for the whole application.
package asclasses
import flash.display.Sprite;
import flash.events.*;
import flash.net.XMLSocket;
import mx.controls.Alert;
public class SocketComm extends Sprite
private var hostName:String = "localhost";
private var port:uint = 8080;
private var socket:XMLSocket;
public function createSocketConnection(hostName:String,
port:uint):XMLSocket {
if(socket == null) {
socket = new XMLSocket();
socket.connect(hostName, port);
}else if(socket != null && !socket.connected) {
socket.connect(hostName, port);
return socket;
Actually now i am able to communicate with server over
XMLSocket.
There was some problem at server side.
But still i am not comfortable with using
SocketComm(XMLSocket) as a common utility class due to event based
asynchronus model. Like in Java Socket all calls are synchronus, I
can easily create common class for socket communication.
But due to my unfamiliarity with event based asynchrous model
of programming, I am facing difficulties.
Like my requirement is to use SocketComm class as a
communication medium with server for various business operations
like add, modify and delete etc. from various Flex UI screens. But
due to event based model, I am not really sure how and when socket
is going to send response.
So if you look at my first post, I have added all listeners
to mxml page but i feel this is not a good design, As i have
atleast 4-5 mxml pages where in I will repeat these listeners.
I would really appreciate if you could provide me some
guidance on using SocketComm class as a effective common class.
Thanks in advance :)
Regards
Tarun