Flex中如何监测摄像头Camera对象活动以及状态事件与信息

flex中文案例:http://blog.minidx.com/2009/03/05/2228.html

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"         layout="horizontal"         verticalAlign="middle"         backgroundColor="white">       <mx:Script>         <![CDATA[             import mx.controls.Alert;             import mx.utils.StringUtil;               private function videoDisplay_creationComplete():void {                 var camera:Camera = Camera.getCamera();                 if (camera) {                     videoDisplay.attachCamera(camera);                     camera.addEventListener(ActivityEvent.ACTIVITY, camera_activity);                     camera.addEventListener(StatusEvent.STATUS, camera_status);                 } else {                     Alert.show("You don't seem to have a camera.");                 }             }               private function camera_activity(evt:ActivityEvent):void {                 var str:String = "[{0}] activating:{1}\n";                 textArea.text += StringUtil.substitute(str,                                     evt.type,                                     evt.activating);             }               private function camera_status(evt:StatusEvent):void {                 var str:String = "[{0}] code:'{1}', level:'{2}'\n";                 textArea.text += StringUtil.substitute(str,                                     evt.type,                                     evt.code,                                     evt.level);                 switch (evt.code) {                     case "Camera.Muted":                         Alert.show("User denied access to camera.");                         break;                     case "Camera.Unmuted":                         Alert.show("User allowed access to camera.");                         break;                 }             }         ]]>     </mx:Script>       <mx:VideoDisplay id="videoDisplay"             creationComplete="videoDisplay_creationComplete();"             width="160"             height="120" />       <mx:TextArea id="textArea"             editable="false"             width="100%"             height="{videoDisplay.height}"             wordWrap="false"             verticalScrollPolicy="on" />   </mx:Application>

?