Catching an unhandled IOErrorEvent in Flash AS3

Question

Error #2044: Unhandled IOErrorEvent:. text=Error #2036: Load Never Completed.

That's what I see every time I try to load an image that doesn't exist using a Loader. I'm getting a list of URLs and can't validate if they're pointing to anything useful. Whenever it encounters a 404 it gives me that error.

I have tried to catch the error with every available IOErrorEvent there is (there are 7 of them),but none of them seem to capture the 404. Is there some other network event that I can be looking for to catch this condition?! I feel like I'm missing something obvious.

What I'd really like is to be able to catch the event regardless of its description and just deal with it... sort of like

myLoader.addEventListener(IOErrorEvent.*, dealWithError);

But that's illegal. I even tried catching

HTTPStatusEvent.HTTP_STATUS

but that never calls back because, I guess, it gets the HTTP status after it deals with the error events, so, as it fails on the "unhandled" error event, it just gets lost. Are there events that aren't in the IDE that I'm overlooking?

All help appreciated.

I'm using Loader because I'm loading an image into the object. Should I use URLLoader and then stream the byte array into the MC? I'll do that if that's the solution — Yevgeny Simkin, Apr 14 '11 at 22:16
interesting... URLLoader DOES capture the IO_ERROR and handle it correctly... I guess the bytestream approach (what a HORRIBLE kluge!) is the answer... write it up, I'll give you the checkmark. :) — Yevgeny Simkin, Apr 14 '11 at 22:17
normally, the method suggested in my answer should work for a loader :) — Michiel Standaert, Apr 14 '11 at 22:29

score 23 · Accepted Answer · answered Apr 14 '11 at 22:18

23

if you are using a loader; try adding the eventListener to the contentLoaderInfo of the loader, e.g.

myLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, loaderIOErrorHandler);

answered Apr 14 '11 at 22:18

Michiel Standaert

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a HA! that's where they hid it... very clever! (too clever by half, in fact). – Yevgeny Simkin Apr 14 '11 at 22:39
i knew the event.complete was fired there, so it was only logical the ioError was fired there too ;) – Michiel Standaert Apr 14 '11 at 22:46
Yeah even after being a flash developer for 2+ years, I still occasionally make this mistake. SUPER irritating. – Tim Keating Sep 12 '13 at 18:49

score 5 · Answer 2 · edited Nov 16 '12 at 01:34

5

You must listen for the IOErrorEvent.IO_ERROR of your URLLoader object.

urlLoader.addEventListener(IOErrorEvent.IO_ERROR, loaderIOErrorHandler);
function loaderIOErrorHandler(errorEvent:IOErrorEvent):void{
    trace("ioErrorHandler: " + errorEvent);
}

If you trace the event object, then it should give you some information about what is going on.

edited Nov 16 '12 at 01:34

IAmMearl

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answered Apr 14 '11 at 22:15

Adam Harte

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I wasn't using URLLoader (though that turned out to be an alternative solution... reading the bytestream and loading THAT into a loader), it's the Loader object that I was using directly and it is not catching the IO_ERROR – Yevgeny Simkin Apr 14 '11 at 22:24

The_asMan · Answer 3 · 2011-04-14T22:40:45.730

2

Have you tried

loader.addEventListener(IOErrorEvent.IO_ERROR, errorHandlerIOErrorEvent);

[EDIT]
Also include contentLoaderInfo events?

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
loader.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler );

edited Apr 14 '11 at 22:40

answered Apr 14 '11 at 22:08

The_asMan

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yes, along with the 6 other IOErrorEvents. NONE of them are the culprits, and I can't figure out how to actually find out WHAT error it's seeing. – Yevgeny Simkin Apr 14 '11 at 22:12
can you post all related code to you myLoader object. Without your code at this point we are just guessing. My gut is telling me you are not scoping something correctly. Also editing my post with more info. – The_asMan Apr 14 '11 at 22:39

Jason Towne · Answer 4 · 2011-04-14T22:40:38.153

2

It looks like IOErrorEvent.IO_ERROR should work. Also make sure you're using a URLLoader to retrieve the image.

Based on the example from the comments:

package {

    import flash.display.Sprite;
    import flash.utils.ByteArray;
    import flash.display.Loader;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    import flash.net.URLLoaderDataFormat;
    import flash.geom.Rectangle;
    import flash.events.Event;

    public class Main extends Sprite {

        private var urlLoader:URLLoader = new URLLoader();

        public function Main() {
            urlLoader.dataFormat = URLLoaderDataFormat.BINARY;
            urlLoader.load(new URLRequest("http://www.java2s.com/image2.jpg"));

           urlLoader.addEventListener(Event.COMPLETE, completeHandler);
           urlloader.addEventListener(IOErrorEvent.IO_ERROR, imageNotFound);
       }

       private function completeHandler(event:Event):void {
           var loader:Loader = new Loader();
           loader.loadBytes(urlLoader.data);
           addChild(loader);
       }

       private function imageNotFound(ev:Event):void{
        trace("File not found.");
       }
    }
}

edited Apr 14 '11 at 22:40

answered Apr 14 '11 at 22:08

Jason Towne

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@Dr.Dredel, Make sure you're using a `URLLoader` like in the example above. – Jason Towne Apr 14 '11 at 22:18
agreed, but please add the code to actually draw the image, otherwise this is pointless! :) Here's an example...http://www.java2s.com/Code/Flash-Flex-ActionScript/Network/LoadingImages.htm – Yevgeny Simkin Apr 14 '11 at 22:34
oh, I see... sorry, I was overlooking you loading it into the Loader... ok... well... if anyone looks at this answer, please note that there is one missing line here whereby you have to set the format to BINARY or you'll get an exception trying to load the data into the Loader... otherwise, the above works. – Yevgeny Simkin Apr 14 '11 at 22:37
ah crap... the answer from Michiel Standaert is the "correct" answer to my actual question, but I upvoted yours as it's also a great solution. – Yevgeny Simkin Apr 14 '11 at 22:38

Catching an unhandled IOErrorEvent in Flash AS3

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