Pete's Blog

Pete,

I am getting errors on flex side during deserialization .

ArgumentError: Error #2004: One of the parameters is invalid.
at flash.utils::ObjectInput/readObject()

I guess that flex does not recognize/link flash.utils.IExternalizable interface and is trying to deserialize all the classes in a normal way.
Is this a bug or is there a work around

Thanks
Karthik

It's not that Flash or Flex does not recognize the interface, it's that it can't find a class definition that matches the reported implementation. You need to create a reference to the Class somewhere in your Flex application (i.e. type a private static variable with that class, or use that Class in a casting statement on the result or a method signature - whatever - just some way to make the compiler note the dependency on this so it will link it into the SWF).

Great post Pete, I've extended what you've done with some alternate approaches to dealing with data you don't want serialized and evolving classes.

http://troyworks.com/blog/?cat=30

I discovered that by default FDS don't contain RemoteClass metdata in section of flex-config.xml. That eat about of my 2 hours. Should I post bug somewhere?

I create the following function

---------------------------------

package com.cerebrum.utils {

import mx.rpc.events.ResultEvent
import mx.controls.Alert;

public class Result {

[Embed("/assets/images/dialog-information.png")]
public var IconDialogInformation:Class;

public function Result(event:ResultEvent,MyObject:Object):void {
Alert.show("teste", "teste", 4, null, null, IconDialogInformation);
}

}

}

---------------------------------

I as follows

import Result;

Result(event, meuobjeto);

---------------------------------

Is presented in the following error flex builder

1137: Incorrect number of arguments. Expected no more than 1.

---------------------------------

How should I inform the function that actually has 2 parameters?

You cannot register an event listener that has more than one argument. If you want to retain more information, get the mx.rpc.AsyncToken instance which is returned immediately in ActionScript from a call to any RemoteObject method, decorate this token (it's dynamic, so it should be just like a "hashmap" like AS Object is) with extra info, and then get the token back from the ResultEvent instance in your handler.

Hey Pete,

I have an object that has a property "children" (an ArrayCollection) that contains more of this same object, and that child object could have more children as well. The object implements IExternalizable. If my test object has no children, it will externalize just fine. Well that's a problem because I want to externalize the children as well. My writeExternal is below:

public function writeExternal(output:IDataOutput):void {

	output.writeInt(this.type);

	this.children.writeExternal(output);

	output.writeUTF(this.word1);

	output.writeUTF(this.word2);

	output.writeUTF(this.word3);

}

With children in the object's AC it crashes on line 452 of ArrayList. It's the writeObject(_source) call. Is it because the source contains my custom object? How do I make it work?

Ignore previous comment please. It was the same as the first issue. As soon as I registered the class the serialization worked. Thanks!

i don't think that i'm double posting what karthik posted, but...

so if you forget to add the [RemoteClass(alias="com.blah.Foo")] metadata, FR/LCDS will have problem sending an object to the CLIENT and typing it correctly. It also wont have any trouble sending an object to the SERVER, so long as you didn't implement IExternalizable. If you did, and you leave of the metadata, it just doesn't call the writeExternal() method and tries to serialize the entire object graph. i no clue what's wrong with my object where if it tries to serialize the entire object it get the same error as karthik, but once i put in the missing metadata, it called my writeExternal() method and all was well.