Direct3D Can' Create Device?

[SyntaxBubble]

I downloaded the DirectX 8 development documents and I was trying to create my first Direct3D program. I created a window. Then, I tried to initialize Direct3D. Everything works until I use the CreateDevice() Function. It pops up with my error message, and says something like DIRECT3D_INVALIDCALL. Can someone help me? I did exactly what is in the docs. I have DirectX 8.01 on my computer. It's a PII, 128MB RAM, Windows 98 computer. I even tried it on a computer that has an nVidia card.

Thanks,
Matt U.

[MrWizard]

If you posted your init code I might be able to help you.

[SyntaxBubble]

Okay, sorry. Here it is:

// This Function Initializes D3D
int D3D_Init (HWND hwnd, IDirect3DDevice8* d3d_dev, LPDIRECT3D8 d3d8, D3DDISPLAYMODE disp, D3DPRESENT_PARAMETERS dpp)
{
  if (NULL == (d3d8 = Direct3DCreate8 (D3D_SDK_VERSION)))
    return -1;

  if (FAILED (d3d8->GetAdapterDisplayMode (D3DADAPTER_DEFAULT, &disp)))
    return -2;

  ZeroMemory (&dpp, sizeof (dpp));
  dpp.Windowed           = TRUE;
  dpp.hDeviceWindow      = hwnd;
  dpp.SwapEffect         = D3DSWAPEFFECT_DISCARD;
  dpp.BackBufferFormat   = disp.Format;

  if (FAILED (d3d8->CreateDevice (D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd,
                                  D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                  &dpp, &d3d_dev)))
    return -3;
}

[MrWizard]

I don't have this line in my code.

dpp.hDeviceWindow = hwnd;

You already pass it to the function (CreateDevice). Also I assume prior to calling this function you fill in D3DDISPLAYMODE settings with GetAdapterMode( ) .