IDirectDraw2::WaitForVerticalBlank
The IDirectDraw2::WaitForVerticalBlank method helps the application synchronize itself with the vertical-blank interval.
HRESULT WaitForVerticalBlank(
DWORD dwFlags,
HANDLE hEvent
);
Parameters
dwFlags
Determines how long to wait for the vertical blank.
| DDWAITVB_BLOCKBEGIN | ||
| Returns when the vertical-blank interval begins. | ||
| DDWAITVB_BLOCKBEGINEVENT | ||
| Triggers an event when the vertical blank begins. This value is not currently supported. | ||
| DDWAITVB_BLOCKEND | ||
| Returns when the vertical-blank interval ends and the display begins. | ||
hEvent
Handle of the event to be triggered when the vertical blank begins. This parameter is not currently used.
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_INVALIDOBJECT |
| DDERR_INVALIDPARAMS |
| DDERR_UNSUPPORTED |
| DDERR_WASSTILLDRAWING |
QuickInfo
Windows NT: Use version 4.0 or later.
Windows: Use Windows 95 or later. Available as a redistributable for Windows 95.
Windows CE: Unsupported.
Header: Declared in ddraw.h.
Import Library: Use ddraw.lib.
See Also
IDirectDraw2::GetVerticalBlankStatus, IDirectDraw2::GetScanLine