C / C++ / MFC

IDispatch and dispinterface

12-Sep-08 21:01

Hello everyone,

I am making some in-depth study of how universal marshaler utilizes typelib for an interface and generate universal (common) marshal code for all the the interfaces which is automation compatible.

My question before the study is why there could be common code universal (common) marshal DLL be suitable for all kinds of auomtation compatible inerface.

My conclusion is, the universal marahler will be able to recognize the data types of parameters/return values of automation compatible types, and will also know how to deal with the serialize/unserialize of them. So, it could have common code.

Is my conclusion and understanding correct?

thanks in advance,
George

George_George12-Sep-08 20:44

12-Sep-08 20:44

Hello everyone,

1.

I read some MSDN document and some other forum discussions about the differences between IDispatch and dispinterface, but still confused. From MSDN, dispinterface is another interface inherits from IDispatch?

2.

And when we declare dispinterface SomeInterce, then it means SomeInterface inherits from dispinterface interface and dispinterface inherits from IDispatch?

thanks in advance,
George

CPallini12-Sep-08 21:30

CPallini

12-Sep-08 21:30

IDispatch & dispinterface are quite different entities: the former is a COM interface, while the latter is a ODL statement.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

George_George13-Sep-08 23:30

13-Sep-08 23:30

Thanks CPallini,

Any differences between the 2 definitions of interface?

- Define an interface dispinterface, e.g. dispinterface IFoo;

- Making an interface inherits from IDispatch, e.g. IFoo : IDispatch.

regards,
George

Hamid_RT15-Sep-08 2:03

15-Sep-08 2:03

See here[^] and here[^] if they are helpful for you. Smile | :)

George_George15-Sep-08 2:26

15-Sep-08 2:26

Thanks Hamid,

The article you referred is good. But it does not explicitly mention what is the differences between IDispatch and dispinterface. Any comments?

(If I missed any points in the articles, please feel free to point out.)

regards,
George

Hamid_RT15-Sep-08 2:36

15-Sep-08 2:36

No it was not for different its for info,it was not helpful for you?

George_George15-Sep-08 2:50

15-Sep-08 2:50

Hi Hamid,

The links are good. But it does not answer my questions directly. My question is about what is the differences between IDispatch and dispinterface. Both of the links do not give a direct answer.

Any comments? Smile | :)

regards,
George

Hamid_RT15-Sep-08 2:54

15-Sep-08 2:54

Thats right Smile | :)

.Now I have a question of you use of c++ or C#? Smile | :)

George_George15-Sep-08 3:24

15-Sep-08 3:24

Hi Hamid,

I use both. Any ideas or comments to my original question? Smile | :)

regards,
George

Hamid_RT15-Sep-08 3:35

15-Sep-08 3:35

If you want to get answer to your question you must be know info about both.(I decided to learn C# is it easy or hard?) Smile | :)

George_George15-Sep-08 3:53

15-Sep-08 3:53

Thanks Hamid,

C# is not hard. It is more and more popular and I suggest you to learn. Smile | :)

What do you mean "info about both"? I think I am lacking the knowledge about what means dispinterface. Any ideas?

regards,
George

Hamid_RT15-Sep-08 4:38

15-Sep-08 4:38

Do you know it very well how many times I need to learn it like c++? (for disinterface see http://www.techvanguards.com/com/tutorials/tips.asp[^]). Smile | :)

George_George15-Sep-08 17:08

15-Sep-08 17:08

Anyway, Hamid. Do you have any ideas to my original question?

regards,
George

Hamid_RT15-Sep-08 19:52

15-Sep-08 19:52

IDispatch is a COM interface it has two useful methods Invoke/GetIDsOfNames for script-based clients but for dispinterfaces did you see here[^]? Smile | :)

George_George15-Sep-08 20:22