D3D device in vgasave - c++

Question

Is it possible to create device/directx application when pc uses vgasave mode?
This is my init function:
d3d = Direct3DCreate9(D3D_SDK_VERSION); // create the Direct3D interface
D3DPRESENT_PARAMETERS d3dpp; // create a struct to hold various device information
ZeroMemory(&d3dpp, sizeof(d3dpp)); // clear out the struct for use
d3dpp.Windowed = TRUE; // program windowed, not fullscreen
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; // discard old frames
d3dpp.hDeviceWindow = hWnd; // set the window to be used by Direct3D
// create a device class using this information and the info from the d3dpp stuct
d3d->CreateDevice(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL,
hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp,
&d3ddev);
However when i call later
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 40, 100), 1.0f, 0);
Program crashes, reporting about unhandled violation. Or maybe it isn't about vga, just I'm making something wrong?
CreateDevice returns D3DERR_NOTAVAILABLE

Answer 1

You've filled out way too few parameters in the D3DPRESENT_PARAMETERS. You've alomst certainly got bad settings for the back buffer and that kind of thing. If CreateDevice returns D3DERR_NOTAVAILABLE, then the d3ddev pointer is NULL, resulting in the access violation when you try to clear the back buffer- since there is no device.
D3DDeviceParameters.Windowed = true;
D3DDeviceParameters.BackBufferHeight = 0;
D3DDeviceParameters.BackBufferWidth = 0;
D3DDeviceParameters.BackBufferCount = 1;
D3DDeviceParameters.BackBufferFormat = D3DFMT_X8R8G8B8;
D3DDeviceParameters.MultiSampleQuality = 0;
D3DDeviceParameters.MultiSampleType = D3DMULTISAMPLE_NONE;
D3DDeviceParameters.SwapEffect = D3DSWAPEFFECT_DISCARD;
D3DDeviceParameters.hDeviceWindow = OS->GetHWND();
D3DDeviceParameters.EnableAutoDepthStencil = true;
D3DDeviceParameters.AutoDepthStencilFormat = D3DFMT_D24S8;
D3DDeviceParameters.Flags = 0;
D3DDeviceParameters.FullScreen_RefreshRateInHz = 0;
D3DDeviceParameters.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE; // Vsync.
This is my D3DPRESENT_PARAMETERS.