ICameraControl::get_FocusRelative method (vidcap.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The get_FocusRelative method returns the relative focus. The relative focus indicates the direction in which the lens group is moving.

Syntax

HRESULT get_FocusRelative(
  [out] long *pValue,
  [out] long *pFlags
);

Parameters

[out] pValue

Receives the relative focus. The size of the value represents the speed at which the focal point changes; a higher value represents a higher speed. To get the range of possible values, call ICameraControl::getRange_FocusRelative.

[out] pFlags

Receives one or more flags. See CameraControlFlags.

Return value

Returns an HRESULT value.

Requirements

See also

Error and Success Codes

ICameraControl Interface