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This method determines the top-level behavior of the application.
HRESULT SetCooperativeLevel(HWNDhWnd,DWORDdwFlags);
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_CREATEDEVICEWINDOW Is not supported in Windows CE. DDSCL_EXCLUSIVE Requests the exclusive level. This flag must be used with the DDSCL_FULLSCREEN flag.
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.
DDSCL_NOWINDOWCHANGES Indicates that DirectDraw is not allowed to minimize or restore the application window on activation. These flags are not supported in Windows CE.
DDSCL_ALLOWMODEX DDSCL_ALLOWREBOOT DDSCL_ALLOWSYSKEY DDSCL_FPUSETUP DDSCL_MULTITHREADED DDSCL_SETDEVICEWINDOW DDSCL_SETFOCUSWINDOW
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_HWNDALREADYSET |
| DDERR_HWNDSUBCLASSED |
| DDERR_INVALIDOBJECT |
| DDERR_INVALIDPARAMS |
| DDERR_OUTOFMEMORY |
Remarks
This method must be called by the same thread that created the application window.
An application must set either the DDSCL_EXCLUSIVE or the DDSCL_NORMAL flag.
The DDSCL_EXCLUSIVE flag must be set to call functions that can have drastic performance consequences for other applications.
Interaction between this method and the IDirectDraw4::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
OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
Header: Ddraw.h.
Link Library: Ddraw.lib.
See Also
IDirectDraw4::SetDisplayMode | IDirectDraw4::Compact | IDirectDraw4::EnumDisplayModes
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