Let?s assume we have object B and aggregated object C (in-
proc server), created by B. Can you access any interface of
B from C? What?s the difference between aggregated and
contained objects?

Answers were Sorted based on User's Feedback



Let?s assume we have object B and aggregated object C (in- proc server), created by B. Can you acce..

Answer / mms zubeir

For the first question, Yes, we can since the QueryInterface
() rules of thumb suggest that if we can query an interface
of C from B, we should be able to query the viceversa.
The IUnknown implementation of both the objects has to do
the 'magic'.

For the second question, Aggregation bounds outer and inner
objects together and gives the user the interface pointers
of either objects to access it directly so that the user
never knows the objects are aggregated.

But when containment is used, the interface of inner object
never exposed to the client directly rather the outer
object receives the calls and forwards internally. Here
also, the user doesn't know the objects are contained.

Is This Answer Correct ?    2 Yes 1 No

Let?s assume we have object B and aggregated object C (in- proc server), created by B. Can you acce..

Answer / chandrasekharreddy siddamreddy

1. Yes, we can access. In aggresstion will use deligation
concept to directly interact with innner components.

2. Explantion given in answer (1). I will give how we are
achieving that
When we create the Outer Componet Instance internally will
create innner componet instance and keep the IUnknown
pointer of Inner component in Outer Component and Outer
componet IUnknown pointer in InnerComponet to deligate the
calls.

Is This Answer Correct ?    0 Yes 1 No

Let?s assume we have object B and aggregated object C (in- proc server), created by B. Can you acce..

Answer / kirba

Go through the book called "Inside COM+ Base Services"
or "Inside DCOM" by Guy Edon & Henry Edon under topic
IUnknown interface.You could be able to understand the Core
interns of Aggregation & Containment

Is This Answer Correct ?    0 Yes 1 No

Post New Answer

More COM DCOM Interview Questions

Can I use com components from .net programs?

0 Answers  


what is oops

11 Answers   Accenture,


C is aggregated by B, which in turn aggregated by A. Our client requested C. What will happen?

2 Answers  


Explain queued components.

2 Answers  


How does a DCOM component know where to instantiate itself?

1 Answers  






How to create an instance of the object in COM?

0 Answers  


Suppose we have object b and aggregated object c (in- proc server), created by b. Can you access any interface of b from c? What?s the difference between aggregated and contained objects?

0 Answers  


What are the purposes of AddRef, Release and QueryInterface functions

2 Answers  


How can would you create an instance of the object in COM

2 Answers  


Is dcom dead?

0 Answers  


hi,I have applied for NIC test plz if any one have test paper pattrn plz send me on "mn_mayank38@yahoo.co.in"

1 Answers  


can a COM interface be implemented by more than one COM class in the same COM component?

2 Answers   Cap Gemini, Honeywell,


Categories