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IDirectDraw::WaitForVerticalBlank

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This 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. The following table shows the possible flags.

    Flag Description
    DDWAITVB_BLOCKBEGIN Returns when the vertical-blank interval begins.
    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

Remarks

In a preemptive multithreaded environment, it is unlikely that the IDirectDraw::WaitForVerticalBlank method can synchronize with the vertical-blank interval.

Instead, use appropriate wait flags to time blits and flips.

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::GetVerticalBlankStatus | IDirectDraw::GetScanLine

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