IDirectDraw::SetCooperativeLevel
This method determines the top-level behavior of the application.
HRESULT SetCooperativeLevel(
HWND hWnd,
DWORD dwFlags
);
Parameters
- hWnd
Window handle used for the application. Set to the calling application's top-level window handle (not a handle for any child windows created by the top-level window). This parameter can be NULL when the DDSCL_NORMAL flag is specified in the dwFlags parameter. - dwFlags
The following table shows the possible flags.Flag Description DDSCL_FULLSCREEN Indicates that the exclusive-mode owner will be responsible for the entire primary surface. GDI can be ignored. This flag must be used with the DDSCL_EXCLUSIVE flag.
DDSCL_NORMAL Indicates that the application will function as a regular Windows application. This flag cannot be used with the DDSCL_ALLOWMODEX, DDSCL_EXCLUSIVE, or DDSCL_FULLSCREEN flags.
The current Windows CE implementation allows for processes with NORMAL level to access DirectDraw resources when there is a process in full-screen exclusive mode.
Processes in NORMAL mode can access primary surfaces but are restricted with regard to flipping, creating complex primaries, and setting display modes.
A process may go into full-screen exclusive mode if no other process is in exclusive mode, regardless of whether processes are running at a NORMAL level of cooperation.
Return Values
If the method succeeds, the return value is DD_OK.
If the method fails, the return value may be one of the following error values:
| DDERR_EXCLUSIVEMODEALREADYSET |
| DDERR_INVALIDOBJECT |
| DDERR_INVALIDPARAMS |
| DDERR_OUTOFMEMORY |
Remarks
This method must be called by the same thread that created the application window.
Interaction between this method and the IDirectDraw::SetDisplayMode method differs from their IDirectDraw counterparts.
Developers using Microsoft Foundation Classes (MFC) should keep in mind that the window handle passed to this method should identify the application's top-level window, not a derived child window.
To retrieve your MFC application's top level window handle, use the following code.
HWND hwndTop = AfxGetMainWnd()->GetSafeHwnd();
Requirements
Pocket PC: Windows Mobile 5.0 and later
Smartphone: Windows Mobile 5.0 and later
OS Versions: Windows CE 5.01 and later
Header: Ddraw.h.
Library: Ddraw.lib.
See Also
IDirectDraw::SetDisplayMode | IDirectDraw::EnumDisplayModes
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