AIR应用 调用摄像头拍照并把照片保持到本地文件夹

import com.adobe.images.PNGEncoder;
import com.adobe.images.JPGEncoder;
import flash.filesystem.File;
import flash.filesystem.FileStream;
import flash.filesystem.FileMode;
import flash.media.Camera;
import flash.media.Video;
import flash.events.MouseEvent;
import flash.display.BitmapData;
import flash.utils.ByteArray;

Security.showSettings(SecurityPanel.CAMERA);  //显示摄像头选择面板
var cam:Camera = Camera.getCamera();
cam.setMode(738, 499, 24);                //摄像头视窗大小
var video:Video = new Video(738,499);
video.attachCamera(cam);
this.addChild(video);
video.x = 276;
video.y = 104;

this.addChild(btn);

//全屏
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
btn.addEventListener(MouseEvent.MOUSE_DOWN, saveStill);

var count:int = 0;

function saveStill(e:MouseEvent):void{
if(count >49)count = 0;
var mtr:Matrix = new Matrix(476/738,0,0,370/499,0,0);  //把相框的图片按比例缩小
var bmd:BitmapData = new BitmapData(476, 370);  //最终保存成的图片大小
bmd.draw(video,mtr);

//保存成jpg图片
var jpg:JPGEncoder = new JPGEncoder();
var ba:ByteArray=jpg.encode(bmd);

/*  保存成png图片
var ba:ByteArray = PNGEncoder.encode(bmd);
var file:File = File.desktopDirectory.resolvePath("webcam" + count++ + ".png");
var file:File = File.documentsDirectory.resolvePath("G:\PHPnow\htdocs\phpgetpic\upload\webcam" + count++ + ".png");
*/
var file:File = File.applicationStorageDirectory.resolvePath("G:\\PHPnow\\htdocs\\phpgetpic\\upload\\webcam" + count++ + ".jpg");
var fileStream:FileStream = new FileStream();
fileStream.open(file, FileMode.WRITE);
fileStream.writeBytes(ba);
fileStream.close();

//socket 广播出去
//sendStr("webcam" + (count-1));
}