Quick Tip: Download Files Via SWFs Using FileReference

package

{

	import flash.display.MovieClip;

	import flash.display.Sprite;

	import flash.events.MouseEvent;

	import flash.events.ProgressEvent;

	import flash.net.FileReference;

	import flash.net.URLRequest;

	import flash.text.TextField;

	import flash.events.Event;

	public class FileRefTut extends Sprite

	{

		//Download Buttons at the Stage.We have to define them as public variables in our Document Class in order to use them. 

		//Otherwise, we get error message from Flash. 

		public var btn_img_download : MovieClip,

		           btn_txt_download : MovieClip,

		           btn_mp3_download : MovieClip,

		           mc_loaded        : MovieClip;

		//Progress Bar

		public var mc_progress : MovieClip,

		//Dynamic TextField stays under the Progress Bar.

				   txt_prog    : TextField;

		//Arr_Links hold the list of files.

		private var Arr_Links  : Array;

		//Default Path where the download is stored. 

		//You change it according to your setup.

		//This is relative to the SWF.

		private var defaultPath : String = "assets/";

		//File Name

		private var urlName : String;

		//instance of FileReference() Class

		private var fr : FileReference;

		//url of the requested files

		private var req : URLRequest;

		public function FileRefTut() : void

		{

			//Set buttonMode to true to change mouse curser to hand icon

			btn_img_download.buttonMode = btn_txt_download.buttonMode = btn_mp3_download.buttonMode = true;

			//Set width of the mc_loaded progress bar to 0 when there isn't any downloading

			mc_loaded.scaleX = 0;

			//Create list of files to be downloaded

			//These files must be in the folder specified by defaultPath

			Arr_Links = ["miki-monk.jpg","some-audio.mp3","dummy-text.rtf"];

			//Create a request object

			req = new URLRequest();

			//Create an instance of the FileReference Class

			fr = new FileReference();

			//ProgressEvent to scale Progress Bar

			//We need to add ProgressEvent Listener based on the progress of FileReference

			fr.addEventListener( ProgressEvent.PROGRESS,progressHandler );

			//Use COMPLETE Event to determine when the download has finished

			fr.addEventListener( Event.COMPLETE,completeHandler );

			//Event Listeners for Download Buttons

			//When user clicks any download button, call downloadFile(e:MouseEvent) function

			btn_img_download.addEventListener( MouseEvent.CLICK,downloadFile );

			btn_mp3_download.addEventListener( MouseEvent.CLICK,downloadFile );

			btn_txt_download.addEventListener( MouseEvent.CLICK,downloadFile );

		}

		private function downloadFile( e : MouseEvent ) : void

		{

			//set the download path to the urlName variable according to clicked Download Button

			switch (e.target.name)

			{

				case "btn_img_download":

				urlName = Arr_Links[0];

				break;

				case "btn_mp3_download":

				urlName = Arr_Links[1];

				break;

				case "btn_txt_download":

				urlName = Arr_Links[2];

				break;

			}

			//change text message "progress" to "downloading..." at txt_prog Dynamic TextFiled

			txt_prog.text = "downloading...";

			//Assign url to the req variable

			req.url = defaultPath + urlName;

			//Downlaod requested file

			fr.download( req );			

		}

		private function progressHandler( event : ProgressEvent ) : void

		{

			//We scale the progress bar according to ration of (event.bytesLoaded / event.bytesTotal)

			//So, when scaleX reaches 1, it means the download is finished..	

			mc_loaded.scaleX = (event.bytesLoaded / event.bytesTotal) ;

		}

		private function completeHandler( event : Event ) : void

		{

			//reset progress bar to 0 after download is finished

			mc_loaded.scaleX = 0;

			//change text message 

			txt_prog.text = "download finished";

		}

	}

}