Type Casting Loaded Swf

Question

I'm having trouble type casting an MXML created swf as in I
can't seem to get it to work.
Here is what I'm doing:
1. Created a LoaderTest.swf that loads AppToLoad.swf
2. Made AppToLoad implement ISomeInterface
3. Once AppToLoad.swf is loaded in LoaderTest.swf, attempt to
type
cast it as ISomeInterface
Code (all code is in the same root package):
<!-- Begin ISomeInterface -->
package
public interface ISomeInterface
function doSomething():void;
<!-- End ISomeInterface -->
<!-- Begin AppToLoad -->
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" implements="ISomeInterface">
<mx:Script>
<![CDATA[
private var myInterface:ISomeInterface;
public function doSomething():void
trace("doSomething");
]]>
</mx:Script>
</mx:Application>
<!-- End AppToLoad -->
<!-- Begin LoaderTest -->
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" applicationComplete="start()">
<mx:Script>
<![CDATA[
import mx.managers.SystemManager;
private var ldr:Loader;
private function start():void
ldr = new Loader();
var ldrContext:LoaderContext = new LoaderContext(false,
ApplicationDomain.currentDomain);
ldr.contentLoaderInfo.addEventListener(Event.INIT,
handleLoaded);
ldr.load(new URLRequest("AppToLoad.swf"), ldrContext);
private function handleLoaded(e:Event):void
trace("handleLoaded");
var content:Object = LoaderInfo(e.target).content;
trace("content = "+content);
var typedContent:ISomeInterface = content as ISomeInterface;
trace("typedContent = "+typedContent);
var typedApplication:ISomeInterface = (content as
SystemManager).application as ISomeInterface;
trace("typedApplication = "+typedApplication);
]]>
</mx:Script>
</mx:Application>
<!-- End LoaderTest -->
Output from running LoaderTest:
[SWF] C:\EDGE\testFolder\bin-debug\LoaderTest.swf - 555,437
bytes
after decompression
[SWF] C:\EDGE\testFolder\bin-debug\AppToLoad.swf - 554,844
bytes after
decompression
handleLoaded
content = [object _AppToLoad_mx_managers_SystemManager]
typedContent = null
typedApplication = null
Any idea what I'm doing wrong?
-JP

Answer 1

I'd be interested in seeing the solution as well, but a quick
workaround is to cast it to the unbind operator.
This is how I've always done it... Maybe you can get it to
work with implements:
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="
http://www.adobe.com/2006/mxml"
>
<mx:Script>
<![CDATA[
import mx.events.FlexEvent;
import mx.managers.SystemManager;
import mx.core.Application;
// * gets rid of type checking so we can leave strict
enabled
[Bindable]public var _appLoaded:*;
private var load_finish_playlist:int = 0;
private var load_finish_name:String = "";
private function
onCurrentApplicationComplete(oEvent:Event):void
_appLoaded = Application(oEvent.target.application);
if(load_finish_playlist > 0) {
setPlaylist(load_finish_playlist);
if(load_finish_name != "") {
setPlayerName(load_finish_name);
private function onCompleteAppLoader(oEvent:Event):void
var smAppLoaded:SystemManager =
SystemManager(oEvent.target.content); //get a ref to the loaded app
//listen for the application.complete event
smAppLoaded.addEventListener(FlexEvent.APPLICATION_COMPLETE,
onCurrentApplicationComplete);
public function setPlaylist(id:int):void {
if(_appLoaded) {
_appLoaded.change_playlist(id);
} else {
load_finish_playlist = id;
public function setPlayerName(name:String):void {
if(_appLoaded) {
_appLoaded.set_name(name);
} else {
load_finish_name = name;
public function stopPlayback():void {
_appLoaded.stop_playback();
public function startPlayback():void {
_appLoaded.start_playback();
]]>
</mx:Script>
<!-- <mx:SWFLoader id="player" x="0" y="0" source="
http://...../flash/mixplayer3.swf"
complete="onCompleteAppLoader(event);" trustContent="true"/>
--> <mx:SWFLoader id="player" x="0" y="0"
source="@Embed('../assets/Player.swf')"
complete="onCompleteAppLoader(event);" trustContent="true"/>
</mx:Canvas>