Events of an aggregated object

Hi COM gurus,

here comes a nice question for you:

I've a simple COM object (named for example InnerObject) which fires events.
Now I'm aggregating this inner object in a second object (say OuterObject).

When I create an OuterObject it works fine to query interface for InnerObject and call the methods of InnerObjects.
But how can I catch the events of InnerObject (create an event sink)?

Thanks for any help.

Alpha137

By usual way. OuterObject will be the common client of InnerObject.

Hello Vita,

thanks for your fast reply but I don't understand.

To keep it small and simple I've tested it under VB:

Code:

---

Public WithEvents inner As InnerObject

Private Sub DoIt()
Dim outer As New OuterObject

Set inner = outer
End Sub

---

This gives me a 'runtime error 459: object or class does not support the set of events'.
Is this just another VB restriction?

Alpha137

If
Private WithEvents inner As InnerObject
will not help you, then it's not VB limitation. It's your problem with OuterObject and InnerObject objects or their TypeLib.

Your InnerObject coclass must have

Code:

---

[uuid(...),helpstring("InnerObject Class")]
coclass CInnerObject
{
        [default] interface InnerObject;
        [default, source] dispinterface _InnerObjectEvents;
};

---

Also the OuterObject class must redirect all interface's Query to InnerObject class. Something like

Code:

---

BEGIN_COM_MAP(COuterObject)
...
        COM_INTERFACE_ENTRY_AGGREGATE_BLIND(pInnerObject)

---

***EDIT***
Or other COM_INTERFACE_ENTRY_***AGGREGATE*** macros family.