內容

• 公共類型
• 公共函數
• 信號
• 保護函數
• 宏
• 詳細描述

QCameraControl Class

The QCameraControl 類是用於控製靜止攝像頭 (或視頻攝像機) 的類的抽象基類。 更多...

頭：	#include <QCameraControl>
qmake:	QT += multimedia
繼承：	QMediaControl

• 所有成員列錶，包括繼承成員

公共類型

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

公共函數

	~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 公共函數繼承自 QObject

信號

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

• 2 信號繼承自 QObject

保護函數

QCameraControl (QObject * parent = Q_NULLPTR)

• 9 保護函數繼承自 QObject

宏

QCameraControl_iid

額外繼承成員

• 1 特性繼承自 QObject
• 1 公共槽繼承自 QObject
• 11 靜態公共成員繼承自 QObject

詳細描述

The QCameraControl 類是用於控製靜止攝像頭 (或視頻攝像機) 的類的抽象基類。

此服務的提供是通過 QMediaService 對象憑藉 QMediaService::control()。它被用於 QCamera .

接口名稱對於 QCameraControl is org.qt-project.qt.cameracontrol/5.0 作為定義在 QCameraControl_iid .

另請參閱 QMediaService::requestControl () 和 QCamera .

成員類型文檔編製

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.

成員函數文檔編製

[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 參數。

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.

另請參閱 setCaptureMode ().

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

Signal emitted when the camera capture mode 改變。

[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.

另請參閱 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 () 信號。

另請參閱 state () 和 QCamera::State .

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

Returns the state of the camera service.

另請參閱 setState () 和 QCamera::state .

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

Signal emitted when the camera state 改變。

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.

另請參閱 QCamera::state .

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

Signal emitted when the camera status 改變。

宏文檔編製

QCameraControl_iid

org.qt-project.qt.cameracontrol/5.0

定義接口名為 QCameraControl 類。