IDirectDrawSurface5::PageUnlock (Windows CE 5.0)
This method unlocks a system-memory surface, allowing it to be paged out.
HRESULT PageUnlock(DWORD dwFlags);
Parameters
- dwFlags
This parameter is currently not used and must be set to zero.
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_CANTPAGEUNLOCK |
| DDERR_INVALIDOBJECT |
| DDERR_INVALIDPARAMS |
| DDERR_NOTPAGELOCKED |
| DDERR_SURFACELOST |
Remarks
A lock count is maintained for each surface and is incremented each time IDirectDrawSurface5::PageLock is called for that surface. The count is decremented when IDirectDrawSurface5::PageUnlock is called. When the count reaches zero, the memory is unlocked and can then be paged by the operating system.
This method works only on system-memory surfaces; it will not page unlock a display-memory surface or an emulated primary surface. If an application calls this method on a display-memory surface, this method will do nothing except return DD_OK.
This method was not implemented in the IDirectDraw interface; it has no effect in Windows CE.
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
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