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.

Solution 1

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);

Solution 2

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.

Solution 3

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 );

Solution 4

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.");
       }
    }
}

View more solutions

Comments

[Yevgeny Simkin]

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.

[Jason Towne]

@Dr.Dredel, Make sure you're using a URLLoader like in the example above.

[Yevgeny Simkin]

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]

agreed, but please add the code to actually draw the image, otherwise this is pointless! :) Here's an example...java2s.com/Code/Flash-Flex-ActionScript/Network/…

[Yevgeny Simkin]

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]

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.

[The_asMan]

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.

[Yevgeny Simkin]

a HA! that's where they hid it... very clever! (too clever by half, in fact).

[Michiel Standaert]

i knew the event.complete was fired there, so it was only logical the ioError was fired there too ;)

[surfer01]

Yeah even after being a flash developer for 2+ years, I still occasionally make this mistake. SUPER irritating.