CodingForums.com - How to make thumbnail for image

Hi.
I want to make thumbnail for selected image from local disk, but I don't know what is the proper way to do this.

(this is all in AIR application)

Here is the code that I try to use:

Code:

// I select files from disk

protected function selectTextFile(root:File):void

{

 var imageTypes:FileFilter = new FileFilter("Images (*.jpg, *.jpeg, *.gif, *.png)", "*.jpg; *.jpeg; *.gif; *.png");

 root.browseForOpenMultiple("Select Files", [imageTypes]);

 root.addEventListener(FileListEvent.SELECT_MULTIPLE, filesSelected);

}

// Then I try to make thumbnail for each

protected function filesSelected(event:FileListEvent):void

{

var image_temp:Image;

 var width:Number = 100; // size of thumbnail

 var height:Number = 100;// size of thumbnail



 for (var i:uint = 0; i < event.files.length; i++) 

 {

 image_temp = new Image();

 image_temp.source = event.files[i].nativePath;



 var bitmapData:BitmapData;

 bitmapData=new BitmapData(image_temp.width, image_temp.height); //here is error "ArgumentError: Error #2015: Invalid BitmapData."

 var matrix:Matrix = new Matrix();

 matrix.scale(width / image_temp.width, height / image_temp.height); // scaling the image

 bitmapData.draw(image_temp,matrix);



 // saving thumbnail to desktop          &n bsp;               

 var save:File = File.desktopDirectory.resolvePath("thumb_"+event.files[i].name);

 var fs:FileStream = new FileStream();

 fs.open(save,FileMode.WRITE);

 fs.writeObject(bitmapData);

 fs.close();

 }

}