IO_ERROR check for File/FileStream

Question

Dear all,
Does IO_ERROR events works in this case?
var file:File = File.applicationDirectory;
file = file.resolvePath("settings.cfg");
file.addEventListener(IOErrorEvent.IO_ERROR, ioErrorFileHandler);
stream = new FileStream();
stream.open(file, FileMode.READ);
stream.addEventListener(IOErrorEvent.IO_ERROR, ioErrorFileHandler);
var str:String = stream.readUTFBytes(stream.bytesAvailable);
stream.close();
-Zainu

Answer 1

No you cannot use event listeners because errors are not events You try and catch errors.
try{
     stream.readUTFBytes(stream.bytesAvailable);
} catch(e:IOError) {
     trace(e.message);
// trace
// Error #2029: This URLStream object does not have a stream opened.