FileReference: Loading a Windows-locked file

Question

I'm using Flex in Flash Player 10 on Windows, using FileReference to load a file into memory, as below.

My issue is that when a file is locked by Windows, my FileReference is not giving me any feedback that the file is inaccessible--it simply never dispatches any events after my calling load().

Does anyone have insight into how to tell that Flash Player is unable to open the file?

var fileReference:FileReference = new FileReference();

private function onClick():void {
    fileReference = new FileReference();
    fileReference.addEventListener(Event.SELECT, onSelect);
    fileReference.addEventListener(Event.COMPLETE, onComplete);

    fileReference.addEventListener(Event.CANCEL, onOther);
    fileReference.addEventListener(IOErrorEvent.IO_ERROR, onOther);
    fileReference.addEventListener(ProgressEvent.PROGRESS, onOther);
    fileReference.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onOther);
     // I've tried adding all of the other declared events 
     // for FileReference here as well

    fileReference.browse();
}

private function onSelect(event:Event):void {
    trace(fileReference.name);

    try {
        fileReference.load();
    } catch (e:Error) {
        trace(e);
    }
}

private function onComplete(event:Event):void {
    trace(fileReference.data.length);
}

private function onOther(event:Event):void {
    trace("other:" + event.toString());
}

Answer 1

A possible (dirty) workaround might be to wait for -let say- 10 seconds, and suppose that the file isn't available if no event has triggered then.

Using a setTimeout (and clearing it with clearTimeout in your COMPLETE and *_ERROR events handlers) might do the trick.

I'll be glad if someone could come up with a nicer solution, though.

EDIT: Of course you might want to listen to HTTP_STATUS event (waiting for a 202 answer - if I understood this documentation correctly) rather than waiting for COMPLETE or *_ERROR.