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Thread: Problem implementing iExternalizable

  1. #1
    Senior Member
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    Apr 2004
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    LA
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    Problem implementing iExternalizable

    I've written a trivial class in attempting to better understand iExternalizable's behavior. I can't see that I've done anything wrong, but my code throws an error. Here's my class:
    code:

    package {
    import flash.utils.IDataInput;
    import flash.utils.IDataOutput;
    import flash.utils.IExternalizable;

    public class Foo implements IExternalizable {

    private var A:String;
    public var B:String;

    function C(){
    }

    public function D(val:String):void {
    A = val;
    }

    public function E(val:String):void {
    B = val;
    }

    public function F():String {
    return A + " " + B;
    }

    public function writeExternal(output:IDataOutput): void {
    //output.writeInt(2);
    output.writeUTF(A);
    output.writeUTF(B);
    }

    public function readExternal(input:IDataInput): void {
    A = input.readUTF();
    B = input.readUTF();
    }
    }
    }


    This is the code on the first frame of my FLA:
    code:

    var obj:Foo = new Foo();
    obj.D("a");
    obj.E("b");
    var bytes: ByteArray = new ByteArray();
    bytes.writeObject(obj);


    and here's the error that gets thrown:
    Code:
    ArgumentError: Error #2004: One of the parameters is invalid.
    	at flash.utils::ByteArray/writeObject()
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  2. #2
    Designer, Programmer, Musician angelhdz's Avatar
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    Mar 2010
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    971
    lel, F() function doesn't have arguments when defined, but does when called.
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  3. #3
    Senior Member
    Join Date
    Aug 2012
    Posts
    124
    wrong

  4. #4
    Designer, Programmer, Musician angelhdz's Avatar
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    Already mastering AS3. It was so fun. Now into Javascript and PHP and all its libraries

  5. #5
    Senior Member
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    Aug 2012
    Posts
    124
    F never get call in code, not matter no arg

  6. #6
    Designer, Programmer, Musician angelhdz's Avatar
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    That's true Terrencing. I posted that reply randomly the day of my birthday haha, I just passed by to see if someone was online I was trying to have fun... I checked the code 2 days ago and I realized that F function was never called. Then I tried the code and I realized the issue. I removed the "Foo implements IExternalizable" part and it worked, so I guess that we can not write an external interface into a bytearray... so I read about the IExternalizable class and I discovered that we need to make a public method to write the desired data into a byte array and then we simply return that byte array instance...
    Already mastering AS3. It was so fun. Now into Javascript and PHP and all its libraries

  7. #7
    Senior Member
    Join Date
    Aug 2012
    Posts
    124
    ok , may you post code used or .fla and .as files

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