User Count.

Question

Hi All.
First of all, I'm sorry for my English. But, I'll do my best to explain.
I'm developing Text Chat App with FMS 4, Flex 4.6.
I want to count how many users in.
I've searched enough. And I made some codes.
Server Side Code(main.asc)
application.onAppStart = function()
trace("hihihi");
application.onConnect = function(client)
application.acceptConnection(client);
userCount = application.clients.length;
// Define new client function for a nc.call().
client.callFromClient = function() {
  return userCount;
application.onDisconnect = function(client){
trace("Connection is disconnected!!!");
userCount = application.clients.length;
trace("length is " + userCount);
for(var i=0; i<application.clients.length; i++){
  application.clients[i].call("setUserCount", null, userCount);
SimpleChatTest.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/mx"
      width="497" height="518" minWidth="955" minHeight="600" creationComplete="initApp()">
<fx:Script>
  <![CDATA[
   private var nc:NetConnection;
   private var so:SharedObject;
   private var soUserCount:SharedObject;
   private var myResponder:Responder = new Responder(onReply);
   private function initApp():void{
    nc = new NetConnection();
    nc.client = this;
    nc.connect("rtmp://127.0.0.1/SimpleChatTest/");
    nc.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
    nc.call("callFromClient", myResponder, "Server");
   private function netStatusHandler(event:NetStatusEvent):void{
    switch(event.info.code){
     case "NetConnection.Connect.Success":
      trace("Success Connection!!");
      // share chat contents
      so = SharedObject.getRemote("simpleChat", nc.uri, false);
      so.addEventListener(SyncEvent.SYNC, syncHandler);
      so.connect(nc);
      // share user count
      soUserCount = SharedObject.getRemote("userCount", nc.uri, false);
      soUserCount.addEventListener(SyncEvent.SYNC, syncHandler_UserCount);
      soUserCount.connect(nc);
      break;
   private function syncHandler(event:SyncEvent):void{
    if(so.data["simpleChat"] != undefined){
     view.text += so.data["simpleChat"] + "\n";
   private function syncHandler_UserCount(event:SyncEvent):void{
     trace("soUserCount.data[userCount] in syncHandlerMethod : ", soUserCount.data["userCount"]);
     viewCount.text = soUserCount.data["userCount"];
   /* ServerSide에서 Client length가져오기*/
   public function setUserCount(userCount:Number):void{
    soUserCount.setProperty("userCount", userCount.toString());
   // Responder function for nc.call()
   private function onReply(result:Object):void
    trace("result : " + result);
    soUserCount.setProperty("userCount", result.toString());
    trace("soUserCount.data[userCount] : ", soUserCount.data["userCount"]);
   private function sendMessage():void{
    so.setProperty("simpleChat",  textInput.text);
    textInput.text = "";
  ]]>
</fx:Script>
<fx:Declarations>
  <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:TextArea x="10" y="10" width="329" height="468" id="view"/>
<s:TextInput x="10" y="486" width="246" enter="sendMessage()" id="textInput"/>
<s:Button x="264" y="487" label="Send" click="sendMessage()"/>
<s:Label x="347" y="10" text="Total Users : "/>
<s:Label x="455" y="10" id="viewCount"/>
</s:Application>
I traced result of SharedObject.
Result
Success Connection!!
result : 1
soUserCount.data[userCount] 1
soUserCount.data[userCount] in syncHandlerMethod undefined --> why?
I can't understand why sharedobject's data is dissipated??
Thanks in advanced.
Kevin.
ps. I also wanna use SharedObject in Server Side. Unfortunately I tried tried tried tried many times... But I don't know how to do it. I'm newbie to flex&FMS. Is there some example about that?

Answer 1

Add a method on main.asc as below:
Client.prototype.userCount = function()
     // get the number of connected users
     var count = application.clients.length;
     this.call("receiveUsercount", null, count);
And add a method in client side code ( in initApp() ) as below:
nc.receiveUsercount = function (count)
  //do code here
     trace("Total Users:" + count );    
Now call the FMS method (as below) from client side code when you want current user count details from FMS:
nc.call("userCount", null);