ICameraControl::getRange_Zoom method (vidcap.h)

项目
4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 getRange_Zoom method returns the range of zoom levels supported by the camera.

Syntax

HRESULT getRange_Zoom(
  [out] long *pMin,
  [out] long *pMax,
  [out] long *pSteppingDelta,
  [out] long *pDefault,
  [out] long *pCapsFlag
);

Parameters

[out] pMin

Receives the minimum zoom.

[out] pMax

Receives the maximum zoom.

[out] pSteppingDelta

Receives the smallest step between settings.

[out] pDefault

Receives the default zoom.

[out] pCapsFlag

Receives one or more flags. See CameraControlFlags.

Return value

Returns an HRESULT value.

Remarks

For information about calculating magnification from zoom level, see ICameraControl::get_FocalLengths.

Requirements

Requirement	Value
Minimum supported client	Windows XP with SP2 [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	vidcap.h
Library	Strmiids.lib

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