Flex动态加载SWF文件并获取对象类

示例
关键代码：

  1 <?xml version="1.0" encoding="utf-8"?>
  2 <!--
  3 
  4   [Pepe's Samples] part 1
  5 
  6     Author  : Pepe at Flex User Group in Japan (FxUG).
  7               an architect at LINKcom corporation.
  8     Blog    : http://Shigeru-Nakagaki.com/
  9     FxUG    : http://www.fxug.net/
 10     LINKcom : http://www.linkcom.co.jp/ (Japanese only)
 11 
 12     Instructions
 13       You can use this sample code in your own responsibility.
 14 
 15 -->
 16 <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"
viewSourceURL="srcview/index.html">
 17 
 18     <mx:creationComplete>
 19         <![CDATA[
 20             initApp();
 21         ]]>
 22     </mx:creationComplete>
 23 
 24     <mx:Script>
 25         <![CDATA[
 26             import flash.utils.describeType;
 27             import mx.controls.Alert;
 28             
 29             
 30             private var ld:Loader;
 31             
 32             private function initApp():void
 33             {
 34                 ld = new Loader();
 35                 ld.contentLoaderInfo.addEventListener(Event.COMPLETE,loadCompleted);
 36                 ld.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR,ioErrHandler);
 37                 ld.contentLoaderInfo.addEventListener(
SecurityErrorEvent.SECURITY_ERROR,securityErrHandler);
 38             }
 39             
 40             private function loadSWF():void
 41             {
 42                 var sSWF:String = txtURL.text;
 43                 var req:URLRequest = new URLRequest(sSWF);
 44                 var context:LoaderContext = new LoaderContext(false,
ApplicationDomain.currentDomain,null);
 45                 req.contentType = "";
 46                 ld.load(req,context);
 47             }
 48             
 49             private function getDef():void
 50             {
 51                 var cls:Class = loadClassDefinition(txtClassName.text);
 52                 if(cls){
 53                     var obj:Object = new cls();
 54                     txtDump.text = flash.utils.describeType(obj).toString();
 55                 }
 56             }
 57 
 58             private function loadCompleted(e:Event):void
 59             {
 60                 Alert.show("[" + e.target.url + "] loaded");
 61             }
 62             
 63             private function ioErrHandler(e:IOErrorEvent):void
 64             {
 65                 Alert.show(e.text);
 66             }
 67             
 68             private function securityErrHandler(e:IOErrorEvent):void
 69             {
 70                 Alert.show(e.text);
 71             }
 72             
 73             private function loadClassDefinition(sClassName:String):Class
 74             {
 75                 var cls:Class = null;
 76                 try{
 77                     cls = ld.contentLoaderInfo.applicationDomain.
getDefinition(sClassName) as Class;
 78                     return cls;
 79                 }catch(e:Error){
 80                     throw new IllegalOperationError(sClassName + " doesn't exist");
 81                 }
 82                 return cls;
 83             }
 84             
 85             
 86         ]]>
 87     </mx:Script>
 88 
 89     <mx:Label text="A sample of describing class definition " fontWeight="bold" fontSize="16"/>
 90     <mx:HRule width="100%" height="40" />
 91     <mx:HBox width="100%">
 92         <mx:TextInput id="txtURL" text=
"http://Shigeru-Nakagaki.com/flex_samples/ApplicationDomain/getDefinitionDump
/RunTimeClass03/RunTimeClass03.swf" width="400" />
 93         <mx:Button x="10" y="10" label="Load SWF" click="loadSWF()"/>
 94     </mx:HBox>
 95     <mx:HBox width="100%">
 96         <mx:TextInput id="txtClassName" text="org.Pepe.ExPanel" width="400" />
 97         <mx:Button x="10" y="40" label="Get Definition" click="getDef()"/>
 98     </mx:HBox>
 99     <mx:HBox width="100%" height="90%">
100         <mx:TextArea id="txtDump" width="100%" height="100%"/>
101     </mx:HBox>
102     
103 </mx:Application>
104 
105