[fpc-pascal] Why casting interface as Tobject will result in a different reference?

[Michael Van Canneyt]

On Fri, 26 May 2017, Dennis wrote:

> I defined a generic TList<IMyInterface> //CORBA style interface
>
> var
>    aInt : IMyInterface;
>   aObj : TObject;
> begin
>    aInt :=  MyList.Items[0];
>    aObj := aInt as TObject;
>
>   writeln(  IntToHex(LongWord(aInt),4));
>
>   writeln(  IntToHex(LongWord(aObj),4)); //this will output a different 
> Hex value from previous writeln
>
>
> //This is causing a problem to me because I later
>
>   MyList.Remove(aObj as IMyInterface);//will fail because it is not the 
> same as aInt and thus fail to locate the item to remove
>
>
> Am I missing some fundamental understanding of interface reference?

Why do you think the interface and the object are the same ? They are not.
An interface is just a bunch of method pointers, and an object has instance
data associated with it. Hardly the same thing, I would think ?

Michael.