loaderInfo.addEvenListener doesn't work - actionscript-3

Question

I made a code for preloader that worked when it was written in frame actions. But then I decided to move all the code to classes and a bit reworked it. And now it doesn't work. Function that listener should call is just not called, and I started getting errors when address to argument event in this not-called function.
package {
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.ProgressEvent;
public class Preloader extends MovieClip {
public function Preloader() {
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event):void {
trace("init started");
removeEventListener(Event.ADDED_TO_STAGE, init);
loaderInfo.addEventListener(ProgressEvent.PROGRESS, showProgress);
trace("init completed");
}
private function showProgress(e:Event):void {
trace(loaderInfo.bytesLoaded);
/*info_txt.text = Math.floor(e.bytesLoaded/e.bytesTotal*100) + "%"
if (e.bytesLoaded==e.bytesTotal) {
loaderInfo.removeEventListener(ProgressEvent.PROGRESS, showProgress);
finalizeLoading();
}
/**/
}
private function finalizeLoading():void {
removeChild(info_txt);
var startGame_btn = new StartGame_btn();
addChild(startGame_btn);startGame_btn.x=395;startGame_btn.y=290;
}
}
}
When I uncomment /*info_txt... part. I get this:
Access of possibly undefined property bytesLoaded through a reference with static type flash.events:Event.
Access of possibly undefined property bytesTotal through a reference with static type flash.events:Event.
Access of possibly undefined property bytesLoaded through a reference with static type flash.events:Event.
Access of possibly undefined property bytesTotal through a reference with static type flash.events:Event.

Answer 1

Change loaderInfo to root.loaderInfo in the init method for listening root loaderInfo object. When your script were in timeline this object were documentClass and root simultaneously, so your code have worked properly.
What about errors, just change type of e argument from Event to ProgressEvent in the showProgress method, because Event doesn't gave such properties.

Answer 2

There is a lot wrong with your code.
Here is a simple loader with some of your code added. at the worst it should point you in the right direction.
package {
import flash.display.MovieClip;
import flash.errors.IOError;
import flash.events.AsyncErrorEvent;
import flash.events.ErrorEvent;
import flash.events.Event;
import flash.events.IOErrorEvent;
import flash.events.ProgressEvent;
import flash.events.SecurityErrorEvent;
public class myPreloader extends MovieClip {
public var context:LoaderContext = new LoaderContext();
public var myLoader:Loader = new Loader();
public var url:URLRequest;
public function myPreloader() {
context = new LoaderContext();
context.checkPolicyFile = true;
myLoader = new Loader();
myLoader.addEventListener(AsyncErrorEvent.ASYNC_ERROR, errorHandlerAsyncErrorEvent);
myLoader.addEventListener(IOErrorEvent.IO_ERROR, errorHandlerIOErrorEvent);
myLoader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, errorHandlerSecurityErrorEvent);
myLoader.contentLoaderInfo.addEventListener(Event.INIT, initHandler);
myLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, infoIOErrorEvent);
myLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progressListener);
myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
this.addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event):void {
removeEventListener(Event.ADDED_TO_STAGE, init);
url = new URLRequest("test.swf"); // change this to whatever it is you are loading
myLoader.load( url,context );
myLoader.load( url);
}
public function progressListener (e:ProgressEvent):void{
trace("Downloaded " + e.bytesLoaded + " out of " + e.bytesTotal + " bytes");
info_txt.text = info_txt.text = Math.floor(e.bytesLoaded/e.bytesTotal*100) + "%"
}
public function onLoadComplete( e:Event ):void{
trace( 'onLoadComplete' );
removeChild(info_txt);
var startGame_btn = new StartGame_btn();
addChild(startGame_btn);
startGame_btn.x = 395;
startGame_btn.y=290;
}
public function initHandler( e:Event ):void{
trace( 'load init' );
}
public function errorHandlerErrorEvent( e:ErrorEvent ):void{
trace( 'errorHandlerErrorEvent ' + e.toString() );
}
public function infoIOErrorEvent( e:IOErrorEvent ):void{
trace( 'infoIOErrorEvent ' + e.toString() );
}
public function errorHandlerIOErrorEvent( e:IOErrorEvent ):void{
trace( 'errorHandlerIOErrorEvent ' + e.toString() );
}
public function errorHandlerAsyncErrorEvent( e:AsyncErrorEvent ) :void{
trace( 'errorHandlerAsyncErrorEvent ' + e.toString() );
}
public function errorHandlerSecurityErrorEvent( e:SecurityErrorEvent ):void{
trace( 'errorHandlerSecurityErrorEvent ' + e.toString() );
}
}
}