Re: Component and Interface

May be wrong about this but I think Components do not use the AddRef 
and Release methods to do anything meaningful so if you override 
these with a simple refcounting scheme it may work...

Tony

--- In [email protected], Markus Ostenried 
<chef_007@g...> wrote:
> Hi all,
> 
> I have a component implementing an interface but its destructor 
never gets 
> called.
> My interface is declared in a seperate unit:
> type
>    IMsgComp = interface( IUnknown )
>      ...
>    end;
> 
> In a DLL I have a component implementing the interface:
> type
>    TMsgComp = class( TComponent, IMsgComp );
>      ...
>    end;
> 
> The DLL exports this function:
> function CreateMsgComp: IMsgComp;
> begin
>    Result := TMsgComp.Create( nil );
> end;
> 
> I'm using it in another DLL like this:
> procedure TForm1.MyMethod;
> var
>    Msg: IMsgComp;
> begin
>    Msg := CreateMsgComp;
>    // do some stuff
> end;
> 
> Both the DLL and the EXE use the same unit in which the interface 
is 
> declared. The problem is that TMsgComp's destructor isn't called - 
even if 
> I free the TForm1 instance. Thus the contained Objects inside 
TMsgComp 
> don't get freed. This is strange because when using 
TInterfacedObject 
> instead of TComponent to implement an interface the Objects 
destructor gets 
> called when the interface variable isn't used anymore.
> 
> Can somebody please help me ?
> TIA,
> Markus


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