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If your application uses DirectDraw in windowed mode, you can create windows with any window style. However, full-screen exclusive mode applications cannot be created with the WS_EX_TOOLWINDOW style without risk of unpredictable behavior. The WS_EX_TOOLWINDOW style prevents a window from being the top most window, which is required for a DirectDraw full-screen, exclusive mode application.
Full-screen exclusive mode applications should use the WS_EX_TOPMOST extended window style and the WS_VISIBLE window style to display properly. These styles keep the application at the front of the window z-order and prevent GDI from drawing on the primary surface.
The following example shows one way to safely prepare a window to be used in a full-screen, exclusive mode application.
//////////////////////////////////////////////////////// //
Register the window class, display the window, and init // all
DirectX and graphic objects.
//////////////////////////////////////////////////////// BOOL
WINAPI InitApp(INT nWinMode) { WNDCLASSEX wcex; wcex.cbSize =
sizeof(WNDCLASSEX); wcex.hInstance = g_hinst; wcex.lpszClassName =
g_szWinName; wcex.lpfnWndProc = WndProc; wcex.style =
CS_VREDRAW|CS_HREDRAW|CS_DBLCLKS; wcex.hIcon = LoadIcon (NULL,
IDI_APPLICATION); wcex.hIconSm = LoadIcon (NULL, IDI_WINLOGO);
wcex.hCursor = LoadCursor (NULL, IDC_ARROW); wcex.lpszMenuName =
MAKEINTRESOURCE(IDR_APPMENU); wcex.cbClsExtra = 0 ; wcex.cbWndExtra
= 0 ; wcex.hbrBackground = GetStockObject (NULL_BRUSH);
RegisterClassEx(&wcex); g_hwndMain = CreateWindowEx(
WS_EX_TOPMOST, g_szWinName, g_szWinCaption, WS_VISIBLE|WS_POPUP,
0,0,CX_SCREEN,CY_SCREEN, NULL, NULL, g_hinst, NULL);
if(!g_hwndMain) return(FALSE); SetFocus(g_hwndMain);
ShowWindow(g_hwndMain, nWinMode); UpdateWindow(g_hwndMain); return
TRUE; }
Last updated on Tuesday, May 18, 2004