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DX Symphony in C minor

Started by Aldacron May 21, 2000 at 4:04 AM 4 replies 1.8k views

Original Post

May 21, 2000 at 4:04 AM

Not to start a flame war, but how well does C handle DX com calls vs. C++? I''m wondering if there would be any extra overhead calling lpdd->vtable->function as opposed to lpdd->function in C++. Anyone tested this or know of any tests? I''m terribly weak in theory and fundamentals (self-taught programmer) so I really don''t know what goes on underneath it all.

Kylotan

May 21, 2000 at 9:01 AM

It''s exactly the same. The vtable thing is not COM specific, that''s just how C++ handles polymorphism (the ability to call the member functions for one of several classes through a standard interface). So the efficiency will be unchanged, it just means the code is a little uglier (in my opinion).

Marauderz

May 21, 2000 at 9:59 AM

I think I remember reading somewhere if you were using C, you called a function like

lpdds->Blt(param,param,lpdds);

Were you included the object as the last parameter in the funciton.

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NuffSaid

May 21, 2000 at 11:04 AM

To access DX under C, you''d need to call your functions like this
lpdds->lpVtbl->Function(lpdds, param, param);

The object is the first argument of the function. I know. I use lcc-win32.

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If something sounds stupid but works, it's not stupid

octavsoft

May 21, 2000 at 11:16 AM

I think Marauderz was refering to the macros used to call the functions.
So it would be:

Interface_Function(object,parameters)

Hope it helps

.
Damm keyboard!

Edited by - octavsoft on May 21, 2000 12:21:08 PM

NuffSaid

May 24, 2000 at 10:24 AM

octavsoft,
people actually use those macros? I always kinda preferred the COM way of accessing things, so I never really bothered about those macros.

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If something sounds stupid but works, it's not stupid

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