Flex检测摄像头状态

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				layout="absolute"
				minWidth="955"
				minHeight="600"
				creationComplete="init()">
	<mx:Script>
		<![CDATA[
			import flash.utils.clearInterval;
			import flash.utils.setInterval;

			import mx.controls.Alert;
			private var cam:Camera;
			private var bz:Number;

			private function init():void
			{
				cam=Camera.getCamera();
				vd.attachCamera(cam);
				bz=setInterval(onse, 3000);
			}

			private function onse():void
			{
				if (cam.currentFPS > 0)
				{
					Alert.show("摄像头正常");
					clearInterval(bz);
				}
				else
				{
					clearInterval(bz);
					Alert.show("摄像头被占用");
				}


			}
		]]>
	</mx:Script>
	<mx:VideoDisplay x="10" y="10" width="337" height="293" id="vd"/>

</mx:Application>
关键在于通过判断cam.currentFPS 来判定摄像头是否处于占用状态

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