HTTPService AsyncToken and AsyncResponder example

Question

Where can I find an example of Flex application which implements an HTTPService asynchronously called by an AsyncToken and an AsyncResponder? Thanks in advance

the httpservice send a string like this with a certain frequency:

row#column#number#row#column#number#row#column#number#....

EDITED CODE:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application creationComplete="onCreationComplete()" 
xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
    import mx.rpc.remoting.RemoteObject;
    import mx.rpc.events.ResultEvent;
    import mx.rpc.events.FaultEvent;
    import mx.rpc.http.mxml.HTTPService;
    import mx.rpc.AsyncRequest;
    import mx.rpc.AsyncResponder;
    import mx.rpc.AsyncToken;
    import mx.collections.ArrayCollection;
    import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn;
    import mx.controls.AdvancedDataGrid;
    import mx.controls.Alert;
    import mx.rpc.IResponder;


    [Bindable]
    public var dataList:ArrayCollection;

    public function getResults(source:String) : ArrayCollection {
    var ac:ArrayCollection = new ArrayCollection();
    var data:Array = source.split('#');
    for (var i:int = 0; i < data.length; i += 3) {
    var dataObj:Object = {row: data[i], column: data[i+1], value: data[i+2]};     
    ac.addItem(dataObj)
    }

    return ac;
    }
    public function result(event:ResultEvent):void{
    dataList = getResults( String(event.result) );
    }
    public function fault(event:FaultEvent) : void {
    dataList = getResults(String(event.fault)); 
    }

public function onCreationComplete():void
{
var service:HTTPService = new HTTPService();
service.url = "http://10.15.20.75/server4flex/servlet/Datagen";
service.resultFormat = "text";
var token:AsyncToken = service.send(dataList);
token.addResponder(new mx.rpc.Responder(result, fault));
}

]]>
</mx:Script>
<mx:AdvancedDataGrid id="dg"
dataProvider="{result}"  
liveScrolling="true"  
    x="10" y="10" width="621"
    verticalScrollPolicy="on"
 >
        <mx:columns>
                    <mx:AdvancedDataGridColumn dataField="row"
           headerText="Riga"/>
                    <mx:AdvancedDataGridColumn dataField="column"
           headerText="Colonna"/>
                    <mx:AdvancedDataGridColumn dataField="value" 
           headerText="Valore"/>
        </mx:columns>
 </mx:AdvancedDataGrid>

 </mx:Application>

Answer 1

I dont know what you are really looking after but here or here for example, are way to use AsyncToken and AsyncResponder

Edit:

1. your dataList have to be Bindable
2. Don't set dataList on each loop iteration
3. You have to call you function getResults at some point when your results are ready
4. event in result function is an Event but also a ResultEvent where there is a result field containing your data

Which may look as this (untested):

[Bindable]
public var dataList:ArrayCollection;

public function getResults(source:String) : ArrayCollection {
    var ac:ArrayCollection = new ArrayCollection();
    var data:Array = source.split('#');
    for (var i:int = 0; i < data.length; i += 3) {  
     ac.addItem( {row: data[i], column: data[i+1], value: data[i+2]} );
    }
    return ac;
}

private function result(event:ResultEvent) : void {
 dataList = getResults( String(event.result) );
}

Edit2:

this is a working example using a simple php file to get the data running on a local web server.

Flex part

<?xml version="1.0" encoding="utf-8"?>
<mx:Application creationComplete="onCreationComplete()"
            xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
  import mx.collections.ArrayCollection;
  import mx.rpc.AsyncToken;
  import mx.rpc.Responder;
  import mx.rpc.events.FaultEvent;
  import mx.rpc.events.ResultEvent;
  import mx.rpc.http.mxml.HTTPService;

    [Bindable]
    public var dataList : ArrayCollection;

    public function getResults(source : String) : ArrayCollection {
        var ac : ArrayCollection = new ArrayCollection();
        var data : Array = source.split('#');
        for (var i : int = 0; i < data.length; i += 3) {
            var dataObj : Object = {row: data[i], column: data[i + 1], value: data[i + 2]};
            ac.addItem(dataObj)
        }

        return ac;
    }

    public function result(event : ResultEvent) : void {
        dataList = getResults(String(event.result));
    }

    public function fault(event : FaultEvent) : void {
        //here do whatever you want to manage the error you received
    }

    public function onCreationComplete() : void
    {
        var service : HTTPService = new HTTPService();
        service.url = "http://127.0.0.1/getDatas.php";
        service.resultFormat = "text";
        var token : AsyncToken = service.send();
        token.addResponder(new mx.rpc.Responder(result, fault));
    }

]]>
</mx:Script>
<mx:AdvancedDataGrid id="dg"
                     dataProvider="{dataList}"
                     liveScrolling="true"
                     x="10" y="10" width="621"
                     verticalScrollPolicy="on"
        >
    <mx:columns>
        <mx:AdvancedDataGridColumn dataField="row"
                                   headerText="Riga"/>
        <mx:AdvancedDataGridColumn dataField="column"
                                   headerText="Colonna"/>
        <mx:AdvancedDataGridColumn dataField="value"
                                   headerText="Valore"/>
    </mx:columns>
</mx:AdvancedDataGrid>

</mx:Application>

Php part (getDatas.php)

<?php print "1#c1#v1#2#c2#v2#3#c3#v3"?>