flash - How to use loaderInfo? -

i want make loading bar @ first need have loading info per enter frame. how seem not working. teach me how it?

 var maploader : loader = new loader( );      var maploaderinfoload:number;      var maploaderinfototal:number;  public function engine()  {          addeventlistener( event.enter_frame, onenterframe,false,0,true );          maploader.load( new urlrequest( "mapcontrol.swf" ) );         maploader.contentloaderinfo.addeventlistener(event.complete, completehandler );  } private function onenterframe( evt:event ):void     {maploaderinfoload = maploader.loaderinfo.bytesloaded;         maploaderinfototal = maploader.loaderinfo.bytestotal;         trace(maploaderinfoload);         trace(maploaderinfototal);}  public function completehandler ( eventobj : event ) : void      {          stage.addchild( maploader.content );      } 

the bytestotal of loader's loaderinfo return 0 until loader has fired it's first progress event. there reason why want use enterframe in way rather progress event?

simple progress event example:

var maploader : loader = new loader(); var maploaderinfoload:number; var maploaderinfototal:number;  public function engine()  {     maploader.contentloaderinfo.addeventlistener(event.complete, completehandler );     maploader.contentloaderinfo.addeventlistener(progressevent.progress, progresshandler);     maploader.load( new urlrequest( "mapcontrol.swf" ) );   }  private function progresshandler(evt:progressevent):void {     maploaderinfoload = evt.bytesloaded;     maploaderinfototal = evt.bytestotal;     trace(maploaderinfoload);     trace(maploaderinfototal); } 

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enter frame

of course, there might reason use enterframe event. still in example, let progresshandler example populate variables; or wait until first progress event fired, delete progress event listener , add enterframe listener instead. long don't try read maploader.loaderinfo.bytestotal before first progress event fired should ok.