Question D3D drawing...

[Szaka]

hello. I have created d3d drawing class which works good and it draws rectagles etc in my exe. I wanted to draw in my exe but from dll. I hooked endscene by vtable (working) and draw a rectangle with my function. It crashes..

This is code which works:

HRESULT WINAPI mojeEndScene(LPDIRECT3DDEVICE9 q){
    q->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);
    return realEndScene(q);
}

This cdode does not work:
HRESULT WINAPI mojeEndScene(LPDIRECT3DDEVICE9 q){
    draw.Rect(200,200,200,200,D3DCOLOR_XRGB(123,123,123),q);
    return realEndScene(q);
}

Function is written good (i can call it from exe) and it looks like that in debugger:

002B159B  |.  68 000000FF   PUSH FF000000                            ; /Arg5 = FF000000
002B15A0  |.  6A 14         PUSH 14                                  ; |Arg4 = 00000014
002B15A2  |.  6A 02         PUSH 2                                   ; |Arg3 = 00000002
002B15A4  |.  6A 0A         PUSH 0A                                  ; |Arg2 = 0000000A
002B15A6  |.  68 62020000   PUSH 262                                 ; |Arg1 = 00000262
002B15AB  |.  E8 50FAFFFF   CALL D3D.MALARNIA::Rect                  ; \MALARNIA::Rect

 but when i call it from my hook it looks like this:

6EFC10A0    55              PUSH EBP
6EFC10A1    8BEC            MOV EBP,ESP
6EFC10A3    E8 58FFFFFF     CALL 6EFC1000 // WHY THE FUCK THERE ARE NO PARAMS????
6EFC10A8    5D              POP EBP
6EFC10A9  - FF25 5833FC6E   JMP DWORD PTR DS:[6EFC3358]              ; d3d9.5527279F // this is ump to rest of EndScene

If i NOP the CALL 6EFC1000 everything runs fine. So question : why compiler doesnt add parameters??

 

[c5]

Really strange that the function isn't called normally. Don't think it will matter but try defining the function globally instead of in a class and manually add __cdecl to it. I don't have many ideas regarding your issue really..

 

[NTvalk]

Do you know 100% sure you are hooking right?

 

[Szaka]

i rewrote code from scratch and it works fine :3

 

[YMelvan]

Cool Helloy=)

 

[Szaka]

Why this simple thing does not work?

HRESULT (WINAPI* realDrawIndexedPrimitive)(LPDIRECT3DDEVICE9,D3DPRIMITIVETYPE,INT,UINT,UINT,UINT,UINT);
HRESULT mojeDrawIndexedPrimitive(LPDIRECT3DDEVICE9 device,D3DPRIMITIVETYPE Type,INT BaseVertexIndex,UINT MinIndex,UINT NumVertices,UINT StartIndex,UINT PrimitiveCount){
return realDrawIndexedPrimitive(device, Type, BaseVertexIndex, MinIndex, NumVertices, StartIndex, PrimitiveCount);
}

Code which does nothing but just empty hook. I looked in asm and everything works fine. But after around 10 calls to it it crashes the app....

 

[c5]

Log the return address of the trampoline, is it valid when you crash?