Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
| Microsoft DirectShow 9.0 |
ICameraControl::put_ZoomRelative
This topic applies only to Windows XP Service Pack 2 and later.
The put_ZoomRelative method sets the camera's relative zoom. The relative zoom indicates the direction in which the lens is moving.
Syntax
HRESULT put_ZoomRelative( long Value, long Flags );
Parameters
Value
[in] Specifies the relative zoom. The size of the value represents the desired zoom speed; a higher value represents a higher speed. To get the range of possible values, call ICameraControl::getRange_ZoomRelative.
| Value | Description |
| 0 | Stop zoom lens motion. |
| Positive value | Start moving the zoom lens in the telephoto direction (initiate zoom-in). |
| Negative value | Start moving the zoom lens in the wide angle direction (initiate zoom-out). |
Flags
[in] Zero or more flags. See CameraControlFlags. If the CameraControl_Flags_Auto flag is used, the Value parameter is ignored and the camera sets the default value.
Return Values
Returns an HRESULT value.
Requirements
Header: Include Vidcap.h.
Library: Use Strmiids.lib.
See Also