内容

• 公共类型
• 公共函数
• 信号
• 保护函数
• 宏
• 详细描述

QCameraControl Class

QCameraControl 类是用于控制静止摄像头 (或视频摄像机) 的类的抽象基类。 更多...

头：	#include <QCameraControl>
qmake:	QT += multimedia
继承：	QMediaControl

• 所有成员列表，包括继承成员

公共类型

enum	PropertyChangeType { CaptureMode, ImageEncodingSettings, VideoEncodingSettings, Viewfinder, ViewfinderSettings }

公共函数

	~QCameraControl ()
virtual bool	canChangeProperty (PropertyChangeType changeType , QCamera::Status status ) const = 0
virtual QCamera::CaptureModes	captureMode () const = 0
virtual bool	isCaptureModeSupported (QCamera::CaptureModes mode ) const = 0
virtual void	setCaptureMode (QCamera::CaptureModes mode ) = 0
virtual void	setState (QCamera::State state ) = 0
virtual QCamera::State	state () const = 0
virtual QCamera::Status	status () const = 0

• 32 公共函数继承自 QObject

信号

void	captureModeChanged (QCamera::CaptureModes mode )
void	error (int error , const QString & errorString )
void	stateChanged (QCamera::State state )
void	statusChanged (QCamera::Status status )

• 2 信号继承自 QObject

保护函数

QCameraControl (QObject * parent = Q_NULLPTR)

• 9 保护函数继承自 QObject

宏

QCameraControl_iid

额外继承成员

• 1 特性继承自 QObject
• 1 公共槽继承自 QObject
• 11 静态公共成员继承自 QObject

详细描述

QCameraControl 类是用于控制静止摄像头 (或视频摄像机) 的类的抽象基类。

此服务被提供由 QMediaService 对象凭借 QMediaService::control()。它被用于 QCamera .

接口名称对于 QCameraControl is org.qt-project.qt.cameracontrol/5.0 作为定义在 QCameraControl_iid .

另请参阅 QMediaService::requestControl () 和 QCamera .

成员类型文档编制

enum QCameraControl:: PropertyChangeType

常量	值	描述
QCameraControl::CaptureMode	1	Indicates the capture mode is changed.
QCameraControl::ImageEncodingSettings	2	Image encoder settings are changed, including resolution.
QCameraControl::VideoEncodingSettings	3	Video encoder settings are changed, including audio, video and container settings.
QCameraControl::Viewfinder	4	Viewfinder is changed.
QCameraControl::ViewfinderSettings	5	Viewfinder settings are changed.

成员函数文档编制

[protected] QCameraControl:: QCameraControl ( QObject * parent = Q_NULLPTR)

Constructs a camera control object with parent .

QCameraControl:: ~QCameraControl ()

Destruct the camera control object.

[pure virtual] bool QCameraControl:: canChangeProperty ( PropertyChangeType changeType , QCamera::Status status ) const

Returns true if backend can effectively apply changing camera properties of changeType type while the camera state is QCamera::Active and camera status matches status 参数。

If backend doesn't support applying this change in the active state, it will be stopped before the settings are changed and restarted after. Otherwise the backend should apply the change in the current state, with the camera status indicating the progress, if necessary.

[pure virtual] QCamera::CaptureModes QCameraControl:: captureMode () const

Returns the current capture mode.

另请参阅 setCaptureMode ().

[signal] void QCameraControl:: captureModeChanged ( QCamera::CaptureModes mode )

Signal emitted when the camera capture mode 改变。

[signal] void QCameraControl:: error ( int error , const QString & errorString )

Signal emitted when an error occurs with error code error and a description of the error errorString .

[pure virtual] bool QCameraControl:: isCaptureModeSupported ( QCamera::CaptureModes mode ) const

Returns true if the capture mode is suported.

[pure virtual] void QCameraControl:: setCaptureMode ( QCamera::CaptureModes mode )

Sets the current capture mode .

The capture mode changes are synchronous and allowed in any camera state.

If the capture mode is changed while camera is active, it's recommended to change status to QCamera::LoadedStatus and start activating the camera in the next event loop with the status changed to QCamera::StartingStatus . This allows the capture settings to be applied before camera is started. Than change the status to QCamera::StartedStatus when the capture mode change is done.

另请参阅 captureMode ().

[pure virtual] void QCameraControl:: setState ( QCamera::State state )

Sets the camera state .

State changes are synchronous and indicate user intention, while camera status is used as a feedback mechanism to inform application about backend status. Status changes are reported asynchronously with QCameraControl::statusChanged () 信号。

另请参阅 state () 和 QCamera::State .

[pure virtual] QCamera::State QCameraControl:: state () const

Returns the state of the camera service.

另请参阅 setState () 和 QCamera::state .

[signal] void QCameraControl:: stateChanged ( QCamera::State state )

Signal emitted when the camera state 改变。

In most cases the state chage is caused by QCameraControl::setState (), but if critical error has occurred the state changes to QCamera::UnloadedState .

[pure virtual] QCamera::Status QCameraControl:: status () const

Returns the status of the camera service.

另请参阅 QCamera::state .

[signal] void QCameraControl:: statusChanged ( QCamera::Status status )

Signal emitted when the camera status 改变。

宏文档编制

QCameraControl_iid

org.qt-project.qt.cameracontrol/5.0

定义接口名为 QCameraControl 类。