TypeError: Error #1009: Cannot access a property or method of a null object reference

[stjarna]

I'm building an AS3 media player and I am having trouble loading an external movie. I keep getting the error:

TypeError: Error #1009: Cannot access a property or method of a null object reference at CookBookPlayer$iinit()

Here is my script for the main Loader class:

package  {
	
	
	import flash.display.*;
	import flash.net.URLRequest;
	import flash.events.Event;
	import com.monkeyclaus.mediaplayer.PanControl;
	import com.monkeyclaus.mediaplayer.PlayButton;
	import com.monkeyclaus.mediaplayer.SpectrumGraph;
	import com.monkeyclaus.mediaplayer.VolumeControl;
	import flash.text.TextField;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.events.TimerEvent;
	import flash.media.Sound;
	import flash.media.SoundChannel;
	import flash.media.SoundTransform;
	import flash.net.URLRequest;
	import flash.text.TextFormat;
	import flash.utils.Timer;



	public class LoadPlayer extends Sprite{
		
			
			
			private var _loader:Loader;
			
			public function LoadPlayer(){
				
				//Create the loader and add it to the display list
				_loader = new Loader();
				addChild( _loader );
				
				//add the event handler to interact with the movie
				_loader.contentLoaderInfo.addEventListener( Event.INIT, handleInit );
				
				//Load an external movie
				_loader.load (new URLRequest( "MediaPlayer.swf" ));
			}
			
			// Event Handler called when the external loaded movie is ready
			
			private function handleInit (event:Event):void{
				
				var movie:* = _loader.content;
				
				trace("loaded");
			}
			
		}
		
		
}

and here is the code for the media player application I am trying to load:

package  {
	
	import com.monkeyclaus.mediaplayer.PanControl;
	import com.monkeyclaus.mediaplayer.PlayButton;
	import com.monkeyclaus.mediaplayer.SpectrumGraph;
	import com.monkeyclaus.mediaplayer.VolumeControl;
	import flash.display.Sprite;
	import flash.display.Stage;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.text.TextField;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.events.TimerEvent;
	import flash.media.Sound;
	import flash.media.SoundChannel;
	import flash.media.SoundTransform;
	import flash.net.URLRequest;
	import flash.text.TextFormat;
	import flash.utils.Timer;
	
	public class CookBookPlayer extends Sprite{
		
		private var _channel:SoundChannel;
		private var _displayText:TextField;
		private var _sound:Sound;
		private var _panControl:PanControl;
		private var _playing:Boolean = false;
		private var _playPauseButton:Sprite;
		private var _position:int = 0;
		private var _spectrumGraph:SpectrumGraph;
		private var _volumeControl:VolumeControl;
		
		public function CookBookPlayer() {
			trace("player started");
			//Stage alignment
			stage.scaleMode = flash.display.StageScaleMode.NO_SCALE;
			stage.align = flash.display.StageAlign.TOP_LEFT;
			
			//Enter a frame listener
			var timer:Timer = new Timer(20);
			timer.addEventListener(TimerEvent.TIMER, onTimer);
			timer.start();
			_playing = true;
			
			//Display a text field
			_displayText = new TextField();
			addChild(_displayText);
			_displayText.x = 10;
			_displayText.y = 17;
			_displayText.width = 256;
			_displayText.height = 14;
			
			//Create a sound object
			_sound = new Sound(new URLRequest("ruxpin_turtles_sea_forward.mp3"));
			_sound.addEventListener(Event.ID3, onID3);
			_channel = _sound.play();
			
			//Create a bitmap for spectrum display
			_spectrumGraph = new SpectrumGraph();
			_spectrumGraph.x = 10;
			_spectrumGraph.y = 33;
			addChild(_spectrumGraph);
			
			//Create the play and pause buttons
			_playPauseButton = new PlayButton();
			_playPauseButton.x = 10;
			_playPauseButton.y = 68;
			addChild(_playPauseButton);
			_playPauseButton.addEventListener(MouseEvent.MOUSE_UP, onPlayPause);
			
			
			//Create volume and pan controls
			
			_volumeControl = new VolumeControl();
			_volumeControl.x = 45;
			_volumeControl.y = 68;
			addChild(_volumeControl);
			_volumeControl.addEventListener(Event.CHANGE, onTransform);
			
			_panControl = new PanControl();
			_panControl.x = 164;
			_panControl.y = 68;
			addChild(_panControl);
			_panControl.addEventListener(Event.CHANGE, onTransform);
			
		}
		
		public function onTransform(event:Event):void{
			//Get volume and pan data from controls
			// and apply to a new SoundTransform Object
			_channel.soundTransform = new SoundTransform(_volumeControl.volume, _panControl.pan);
		}
		
		public function onPlayPause(event:MouseEvent):void{
			//If playing, stop and record that position
			if(_playing) {
				_position = _channel.position;
				_channel.stop();
			}
			else{
				//Else, restart at the saved position
				_channel = _sound.play(_position);
			}
			_playing = !_playing;
		}
			
			public function onID3(event:Event):void{
				//Display selected id3 tags in the text field
				_displayText.text = _sound.id3.artist + " : " + _sound.id3.songName;
				_displayText.setTextFormat(new TextFormat("Verdana", 8, 0xffffff));
			}
			
			public function onTimer(event:TimerEvent):void {
				var barWidth:int = 256;
				var barHeight:int = 5;
				
				var loaded:int = _sound.bytesLoaded;
				var total:int = _sound.bytesTotal;
				
				var length:int = _sound.length;
				var position:int = _channel.position;
				
				
				//Draw a background bar
				graphics.clear();
				graphics.beginFill(0xffffff);
				graphics.drawRect(10, 10, barWidth, barHeight);
				graphics.endFill();
				
				if(total > 0) {
					
				//The percent of the sound that has loaded
				var percentBuffered:Number = loaded / total;
				
				//Draw a bar that represents the percent of
				// the sound that has loaded
				graphics.beginFill(0xcccccc);
				graphics.drawRect(10, 10, barWidth * percentBuffered, barHeight);
				graphics.endFill();
				
				//Correct the sound length calculation
				length /= percentBuffered;
				
				//The percent of the sound that has played
				var percentPlayed:Number = position / length;
				
				//Draw a bar that represents the percent of
				// the sound that has played
				
				graphics.beginFill(0xffffff);
				graphics.drawRect(10, 10, barWidth * percentPlayed, barHeight);
				graphics.endFill();
				
				_spectrumGraph.update();
				}
				
				
			}
	}
}

Any ideas? I would greatly appreciate it.

[stjarna]

by the way, this is an application I am building in FLASH CS3, not FLEX 2

[noflashlight]

what does your .fla file look like.
my guess is that...

stage.scaleMode = flash.display.StageScaleMode.NO_SCALE;
stage.align = flash.display.StageAlign.TOP_LEFT;

...is what's doing it.
The stage probably hasn't been instantiated yet.
Try commenting out those two lines and see if the error is still thrown.

[stjarna]

Originally Posted by noflashlight

what does your .fla file look like.
my guess is that...

stage.scaleMode = flash.display.StageScaleMode.NO_SCALE;
stage.align = flash.display.StageAlign.TOP_LEFT;

...is what's doing it.
The stage probably hasn't been instantiated yet.
Try commenting out those two lines and see if the error is still thrown.

Thanks for checking out my code.

I commented out those lines and I'm still getting the same error.

I have a blank main parent .swf with the LoadPlayer class where I am trying to load in the the media player movie. The media player movie's class is called "CookBookPlayer". It works fine when ran on it's own. It only seems to be having problems when I try to load it into a parent .swf.

[SAVAGER]

I am having the same exact problem. Does anyone know why this is?

[fenris23]

I solved this by putting a blank frame in the beggining of my loaded swf, but i dont think this is the best way to do it, anyone has a better sugestion?

[Slowburn]

In your CookBookPlayer constructor your making reference to the stage possibly before the CookBookPlayer gets added to the displayList.
stage and root do not exist in a DisplayObject until you've added them to the displayList using addChild();

you could set up a listener and wait until the DisplayObject has been added to the stage.

package
{
     import flash.display.*;
     public class Test extends Sprite
     {
          public function Test():void
          {
               addEventListener( Event.ADDED, onAdded );
          }
          public function onAdded( event:Event ):void
          {
               removeListener( Event.ADDED, onAdded );
               stage.scaleMode = StageScaleMode.NO_SCALE;
               stage.align = StageAlign.TOP_LEFT;
          }
     }
}

Another idea might be to use your class as a DocumentClass instead of instantiating it ( if your not already )

[hitechv1]

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Map_fla::MainTimeline/frame1()


Here is the code for the preloader

var l:Loader = new Loader();
l.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, loop);
l.contentLoaderInfo.addEventListener(Event.COMPLETE, done);
l.load(new URLRequest('Map.swf'));

function loop(e:ProgressEvent):void {
	var perc:Number = e.bytesLoaded / e.bytesTotal;
	percent.text = Math.ceil(perc*100).toString();
}

function done(e:Event):void {
	removeChildAt(0);
	percent = null;
	addChild(l);
}

here is the code for the Map.swf

stop();
// This Script is for moving the Map with your Arrow Keys.
stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyPressed);

function KeyPressed(evt:KeyboardEvent):void {
switch (evt.keyCode) {
case Keyboard.UP :
Map_mc.y += 25;
break;
case Keyboard.DOWN :
Map_mc.y -= 25;
break;
case Keyboard.LEFT :
Map_mc.x += 25;
break;
case Keyboard.RIGHT :
Map_mc.x -= 25;
break;
}
}

I'm lost and new to flash I'm thinking it's talking about something in the Map.swf but I don't know what. thanks in advanced

[jvrphoto]

Originally Posted by fenris23

I solved this by putting a blank frame in the beggining of my loaded swf, but i dont think this is the best way to do it, anyone has a better sugestion?

Oh my god thanks! that was so easy!

[newbie007]

my guess is that eventlisteners shuld be removed.. i solved the same error by doing that..