有關圖片上傳和儲存的有用代碼

//將可視的UIComponent組件轉換為ByteArray數組，我就是在UIComponent那裡放了一個圖片    
   public  function BitmapDataToByteArray(target : UIComponent):ByteArray{   
    var imageWidth:uint = target.width;   
    var imageHeight:uint = target.height;   
    var srcBmp:BitmapData = new BitmapData( imageWidth, imageHeight );   
    //將組件讀取為BitmapData對象，bitmagData的資料來源    
    srcBmp.draw( target );   
    //getPixels方法用於讀取指定像素地區產生一個ByteArray，Rectangle是一個地區框，就是起始座標    
    var pixels:ByteArray = srcBmp.getPixels( new Rectangle(0,0,imageWidth,imageHeight) );   

    //下面倆行將資料來源的高和寬一起儲存到數組中,為翻轉的時候提供高度和寬度    
    pixels.writeShort(imageHeight);   
    pixels.writeShort(imageWidth);   
    return pixels;   
   }   
   //次方法的參數必須是像上面的ByteArray形式一樣的,即需要對象的大小;    
   //此方法返回的Bitmap可以直接賦值給Image的source屬性    
   public static function ByteArrayToBitmap(byArr:ByteArray):Bitmap{   
    if(byArr==null){   
     return null;   
    }   
    //讀取出存入時圖片的高和寬,因為是最後存入的資料,所以需要到尾部讀取    
    var bmd:ByteArray= byArr;   
    bmd.position=bmd.length-2;   
    var imageWidth:int = bmd.readShort();   
    bmd.position=bmd.length-4;   
    var imageHeight:int= bmd.readShort();   
    var copyBmp:BitmapData = new BitmapData( imageWidth, imageHeight, true );   
    //利用setPixel方法給圖片中的每一個像素賦值,做逆操作    
    //ByteArray數組從零開始儲存一直到最後都是圖片資料,因為讀入時的高和寬都是一樣的,所以當迴圈結束是正好讀完    
    bmd.position = 0;   
    for( var i:uint=0; i<imageHeight ; i++ )   
    {   
     for( var j:uint=0; j<imageWidth; j++ )   
     {   
      copyBmp.setPixel( j, i, bmd.readUnsignedInt() );   
     }   
    }   
    var bmp:Bitmap = new Bitmap( copyBmp );   
    return bmp;   
   }   
    
   public static const FORMAT_JPEG:uint = 0x00;
   public static const FORMAT_PNG:uint = 0x01;
   private static const EXT_JPEG:String = ".jpg";
   private static const EXT_PNG:String = ".png";
   private static const IMAGE_FOLDER:String = "SaveImage/images/";
   private function saveImage(comp:DisplayObject,format:uint):void{
    
    var bmpd:BitmapData = new BitmapData(comp.width,comp.height);
    bmpd.draw(comp);
    var imgByteArray:ByteArray;
    var ext:String;
    switch(format){
     case FORMAT_JPEG:
      ext = EXT_JPEG;
      var jpgenc:JPEGEncoder = new JPEGEncoder(80);
      imgByteArray = jpgenc.encode(bmpd);
      break;
     case FORMAT_PNG:
      ext = EXT_PNG;
      var pngenc:PNGEncoder = new PNGEncoder();
      imgByteArray = pngenc.encode(bmpd);
      break;
    }
    var fl:File = getNewImageFile(ext);
    var fs:FileStream = new FileStream();
    try{
     fs.open(fl,FileMode.WRITE);
     fs.writeBytes(imgByteArray);
     fs.close();
     this.updatephoto(fl);
    }catch(e:Error){
     trace(e.message);
    }
   }
   
   private function getNewImageFile(ext:String):File{
    
    var fileName:String = "image"+getNowTimestamp()+ext;
    var fl:File = File.desktopDirectory.resolvePath(IMAGE_FOLDER+fileName);
    if(fl.exists){
     return getNewImageFile(ext);
    }
    return fl;
   }
   public function updatephoto(file:File):void
   {
    //showimgAvatar.bitmapData.
    var urlrequest:URLRequest=new URLRequest(Config.API_UPDATEAVATAR);
    var variables:URLVariables = new URLVariables();
    variables.doctorID = doctorModel.doctorID;
    urlrequest.data = variables;
    urlrequest.method="post";
    file.addEventListener(Event.COMPLETE, uploadComplete);
    file.addEventListener(IOErrorEvent.IO_ERROR, ioError);
    try {
     file.upload(urlrequest);
    } catch( e:Error ) {
     trace( e );
    }
   }
   private function getNowTimestamp():String{
    var d:Date = new Date();
    var tstamp:String = d.getFullYear().toString()+d.getMonth()+d.getDate()+d.getHours()+d.getMinutes()+d.getSeconds()+d.getMilliseconds();
    return tstamp;  
   }