DirectX and COM objects

Fri Apr 16 01:47:00 GMT 1999

Didn't this issue get resolved by using the COM stuff from LCC-Win 
headers. TRUST ME :) I don't know any details. I just remember 
reading in a DirectX 5.0 Library port to gnuwin32 that the COM stuff 
had to be borrowed from the LCC-Win32 Compiler.
Regards,
Richard
>Using C it is fairly easy to use DirectX with gcc.
>>But most of the samples from MS are in C++. It is possible
>to compile those samples using gcc (I use EGCS 1.1.2), but the
>executable program breaks down. This is due to the fact that
>the layout of COM objects (structs with pure virtual members) in gcc
>differs from that supposed by MS. This has been mentioned in this
>list before by Mumit Khan. 
>>By inspection one finds the following layout for
> struct Obj {
> virtual A(...) = 0;
> virtual B(...) = 0;
> ....
> }
>> MS gcc
> == ===
>> address A (4 bytes) 8 bytes
> address B (4 bytes) DA (4 bytes) address A (4 bytes)
> ... DB (4 bytes) address B (4 bytes)
> ...
>>and DA etc has be 0 to get the code produced by gcc to behave as
>expected by MS. 
>>One possible solution then would be to create a copy of the MS object
>with a layout adapted to gcc. This means rather few changes in the
>but not in all. I suspect that there might be more to an object than
>is seen in the interface declaration, i e there are more things to 
>copy. 
>>Questions:
>1) Any help?
>2) Is there or will there be a compiler flag in gcc which brings
> about the "correct" code for MS COM objects?
>>I don't intend do to do any serious work with DirectX. However it is
>there and I want to climb it by curiousness.
>>Magnus Bondesson
>Department of Computing Science
>Chalmers University of Technology
>S-412 96 Gothenburg
>SWEDEN
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