bool InitWindow(HINSTANCE hInstance, int ShowWnd, int width, int height, bool windowed, D3DDEVTYPE deviceType, IDirect3DDevice9** d3ddev)
{
	WNDCLASSEX wc;  // Extended Windows Class für moderne Windows Systeme.

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = CS_HREDRAW | CS_VREDRAW;  // Fenster soll horizontal und vertikal aktualisiert werden (| kombiniert Hash Werte).
	wc.lpfnWndProc = WndProc; // WinProc Funktion als Pointer übergeben.
	wc.cbWndExtra = NULL;
	wc.cbClsExtra = NULL;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_SHIELD); // Icon mit Hash Wert setzen.
	wc.hCursor = LoadCursor(NULL, IDC_ARROW); // Cursor mit Hash Wert setzen.
	wc.hbrBackground = (HBRUSH)COLOR_WINDOW + 1; // Fenster Hintergrundfarbe setzen.
	wc.lpszMenuName = NULL;  // Menü Name setzen.
	wc.lpszClassName = WndClassName;
	wc.hIconSm = LoadIcon(NULL, IDI_SHIELD); // Icon für minimiertes Fenster.

	if (!RegisterClassEx(&wc))
	{
		MessageBox(0, L"Registering windows failed", L"ERROR", MB_OK);
		return 1;
	}

	hwnd = CreateWindowEx(NULL, WndClassName, L"DirektSaftDemo", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, width, height, NULL, NULL, hInstance, NULL);

	if (!hwnd)
	{
		MessageBox(0, L"Create windowsEX fail", L"ERROR", MB_OK);
		return 1;
	}

	ShowWindow(hwnd, ShowWnd);
	UpdateWindow(hwnd);

	//DirectX Init
	d3d9 = Direct3DCreate9(D3D_SDK_VERSION);
	if (!d3d9)
	{
		MessageBox(0, L"Init d3d9 fail", L"ERROR", MB_OK);
		return 1;
	}

	D3DCAPS9 caps;
	d3d9->GetDeviceCaps(D3DADAPTER_DEFAULT, deviceType, &caps);
	int vertexproc = NULL;
	if (caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)
		vertexproc = D3DCREATE_HARDWARE_VERTEXPROCESSING;
	else
		vertexproc = D3DCREATE_SOFTWARE_VERTEXPROCESSING;

	D3DPRESENT_PARAMETERS d3dpp;
	d3dpp.BackBufferWidth = width;
	d3dpp.BackBufferHeight = height;
	d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8; // 32 bit farbtiefe
	d3dpp.BackBufferCount = 1;
	d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8;
	d3dpp.EnableAutoDepthStencil = true;
	d3dpp.Flags = NULL;
	d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
	d3dpp.hDeviceWindow = hwnd; // Fenster in das gerendert werden soll zuweisen.
	d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;
	d3dpp.MultiSampleQuality = NULL;
	d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT;
	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
	d3dpp.Windowed = windowed;

	HRESULT hr = 0; // Ergebnis für Exception handling.

	hr = d3d9->CreateDevice(D3DADAPTER_DEFAULT, deviceType, hwnd, vertexproc, &d3dpp, d3ddev);
	if (FAILED(hr))
	{
		MessageBox(0, L"Direct 3D device failed!", L"ERROR", MB_OK);
		d3d9->Release(); // Bei Fehler Grafikkarte freigeben.
		return 1;
	}

	d3d9->Release();

	return true;
}