内容

公共类型
特性
公共函数
公共槽
信号
详细描述

QImageCapture 类

QImageCapture 类用于媒体内容的录制。更多...

头：	#include <QImageCapture>
CMake:	find_package(Qt6 COMPONENTS Multimedia REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Multimedia)
qmake:	QT += multimedia
继承：	QObject

所有成员列表，包括继承成员

公共类型

enum	Error { NoError, NotReadyError, ResourceError, OutOfSpaceError, NotSupportedFeatureError, FormatError }
enum	Quality { VeryLowQuality, LowQuality, NormalQuality, HighQuality, VeryHighQuality }

特性

fileFormat : const FileFormat
metaData : QMediaMetaData
quality : const Quality
readyForCapture : const bool

公共函数

	QImageCapture (QObject * parent = nullptr)
virtual	~QImageCapture ()
void	addMetaData (const QMediaMetaData & metaData )
QMediaCaptureSession *	captureSession () const
QImageCapture::Error	error () const
QString	errorString () const
QImageCapture::FileFormat	fileFormat () const
bool	isAvailable () const
bool	isReadyForCapture () const
QMediaMetaData	metaData () const
QImageCapture::Quality	quality () const
QSize	resolution () const
void	setFileFormat (QImageCapture::FileFormat format )
void	setMetaData (const QMediaMetaData & metaData )
void	setQuality (QImageCapture::Quality quality )
void	setResolution (const QSize & resolution )
void	setResolution (int width , int height )

公共槽

int	capture ()
int	captureToFile (const QString & file = QString())

信号

void	errorChanged ()
void	errorOccurred (int id , QImageCapture::Error error , const QString & errorString )
void	fileFormatChanged ()
void	imageAvailable (int id , const QVideoFrame & frame )
void	imageCaptured (int id , const QImage & preview )
void	imageExposed (int id )
void	imageSaved (int id , const QString & fileName )
void	metaDataChanged ()
void	qualityChanged ()
void	readyForCaptureChanged (bool ready )

详细描述

The QImageCapture class is a high level images recording class. It's not intended to be used alone but for accessing the media recording functions of other media objects, like QCamera .

QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);
QVideoWidget *preview = new QVideoWidget();
preview->show();
captureSession.setVideoOutput(preview);
imageCapture = new QImageCapture(camera);
captureSession.setImageCapture(imageCapture);
camera->start();
//on shutter button pressed
imageCapture->capture();

另请参阅 QCamera .

成员类型文档编制

enum QImageCapture:: Error

常量	值	描述
`QImageCapture::NoError`	`0`	没有错误。
`QImageCapture::NotReadyError`	`1`	The service is not ready for capture yet.
`QImageCapture::ResourceError`	`2`	Device is not ready or not available.
`QImageCapture::OutOfSpaceError`	`3`	No space left on device.
`QImageCapture::NotSupportedFeatureError`	`4`	Device does not support stillimages capture.
`QImageCapture::FormatError`	`5`	Current format is not supported.

enum QImageCapture:: Quality

枚举品质编码级别。

常量	值
`QImageCapture::VeryLowQuality`	`0`
`QImageCapture::LowQuality`	`1`
`QImageCapture::NormalQuality`	`2`
`QImageCapture::HighQuality`	`3`
`QImageCapture::VeryHighQuality`	`4`

特性文档编制

`[read-only]` fileFormat : const FileFormat

This property holds the image format.

访问函数：

QImageCapture::FileFormat fileFormat () const

通知程序信号：

void	fileFormatChanged ()

metaData : QMediaMetaData

This property holds the meta data that will get embedded into the image.

注意： Additional fields such as a time stamp or location may get added by the camera back end.

访问函数：

QMediaMetaData	metaData () const
void	setMetaData (const QMediaMetaData & metaData )

通知程序信号：

void	metaDataChanged ()

`[read-only]` quality : const Quality

This property holds the image encoding quality.

访问函数：

QImageCapture::Quality quality () const

通知程序信号：

void	qualityChanged ()

`[read-only]` readyForCapture : const bool

保持 true if the camera is ready to capture an image immediately. Calling capture () while readyForCapture is false is not permitted and results in an error.

访问函数：

bool	isReadyForCapture () const

通知程序信号：

void	readyForCaptureChanged (bool ready )

成员函数文档编制

QImageCapture:: QImageCapture ( QObject * parent = nullptr)

Constructs a image capture object, from a parent , that can capture individual still images produced by a camera.

You must connect both an image capture object and a QCamera to a capture session to capture images.

`[slot]` int QImageCapture:: capture ()

Capture the image and make it available as a QImage . This operation is asynchronous in majority of cases, followed by signals QImageCapture::imageExposed (), QImageCapture::imageCaptured () 或 QImageCapture::error ().

QImageCapture::capture returns the capture Id parameter, used with imageExposed (), imageCaptured () 和 imageSaved () 信号。

另请参阅 isReadyForCapture ().

`[slot]` int QImageCapture:: captureToFile (const QString & file = QString())

Capture the image and save it to file . This operation is asynchronous in majority of cases, followed by signals QImageCapture::imageExposed (), QImageCapture::imageCaptured (), QImageCapture::imageSaved () 或 QImageCapture::error ().

If an empty file is passed, the camera back end chooses the default location and naming scheme for photos on the system, if only file name without full path is specified, the image will be saved to the default directory, with a full path reported with imageCaptured () 和 imageSaved () 信号。

QCamera saves all the capture parameters like exposure settings or image processing parameters, so changes to camera parameters after capture () is called do not affect previous capture requests.

QImageCapture::capture returns the capture Id parameter, used with imageExposed (), imageCaptured () 和 imageSaved () 信号。

另请参阅 isReadyForCapture ().

`[signal]` void QImageCapture:: errorOccurred ( int id , QImageCapture::Error error , const QString & errorString )

Signals that the capture request id has failed with an error and errorString description.

`[signal]` void QImageCapture:: imageAvailable ( int id , const QVideoFrame & frame )

Signal emitted when QImageCapture::CaptureToBuffer is set and the frame with request id 可用。

`[signal]` void QImageCapture:: imageCaptured ( int id , const QImage & preview )

Signal emitted when the frame with request id was captured, but not processed and saved yet. Frame preview can be displayed to user.

`[signal]` void QImageCapture:: imageExposed ( int id )

Signal emitted when the frame with request id was exposed.

`[signal]` void QImageCapture:: imageSaved ( int id , const QString & fileName )

Signal emitted when QImageCapture::CaptureToFile is set and the frame with request id was saved to fileName .

`[signal]` void QImageCapture:: readyForCaptureChanged ( bool ready )

Signals that a camera's ready for capture state has changed.

注意： 通知程序信号对于特性 readyForCapture .

`[virtual]` QImageCapture:: ~QImageCapture ()

Destroys images capture object.

void QImageCapture:: addMetaData (const QMediaMetaData & metaData )

Adds additional metaData to any existing meta data, that is embedded into the captured image.

QMediaCaptureSession *QImageCapture:: captureSession () const

Returns the capture session this camera is connected to, or a nullptr if the camera is not connected to a capture session.

使用 QMediaCaptureSession::setImageCapture () to connect the image capture to a session.

QImageCapture::Error QImageCapture:: error () const

返回当前错误状态。

注意： Getter 函数对于特性 error。

另请参阅 errorString ().

QString QImageCapture:: errorString () const

Returns a string describing the current error state.

注意： Getter function for property errorString.

另请参阅 error ().

bool QImageCapture:: isAvailable () const

Returns true if the images capture service ready to use.

QSize QImageCapture:: resolution () const

返回编码图像的分辨率。

另请参阅 setResolution ().

void QImageCapture:: setFileFormat ( QImageCapture::FileFormat format )

设置图像 format .

另请参阅 fileFormat ().

void QImageCapture:: setMetaData (const QMediaMetaData & metaData )

Replaces any existing meta data, to be embedded into the captured image, with a set of metaData .

注意： Setter 函数对于特性 metaData .

另请参阅 metaData ().

void QImageCapture:: setQuality ( QImageCapture::Quality quality )

设置图像编码 quality .

另请参阅 quality ().

void QImageCapture:: setResolution (const QSize & resolution )

设置 resolution 为编码图像。

空 QSize indicates the encoder should make an optimal choice based on what is available from the image source and the limitations of the codec.

另请参阅 resolution ().

void QImageCapture:: setResolution ( int width , int height )

设置 width and height of the resolution of the encoded image.

这是重载函数。

内容

QImageCapture 类

公共类型

特性

公共函数

公共槽

信号

详细描述

成员类型文档编制

enum QImageCapture:: Error

enum QImageCapture:: Quality

特性文档编制

[read-only] fileFormat : const FileFormat

metaData : QMediaMetaData

[read-only] quality : const Quality

[read-only] readyForCapture : const bool

成员函数文档编制

QImageCapture:: QImageCapture ( QObject * parent = nullptr)

[slot] int QImageCapture:: capture ()

[slot] int QImageCapture:: captureToFile (const QString & file = QString())

[signal] void QImageCapture:: errorOccurred ( int id , QImageCapture::Error error , const QString & errorString )

[signal] void QImageCapture:: imageAvailable ( int id , const QVideoFrame & frame )

[signal] void QImageCapture:: imageCaptured ( int id , const QImage & preview )

[signal] void QImageCapture:: imageExposed ( int id )

[signal] void QImageCapture:: imageSaved ( int id , const QString & fileName )

[signal] void QImageCapture:: readyForCaptureChanged ( bool ready )

[virtual] QImageCapture:: ~QImageCapture ()

void QImageCapture:: addMetaData (const QMediaMetaData & metaData )

QMediaCaptureSession *QImageCapture:: captureSession () const

QImageCapture::Error QImageCapture:: error () const

QString QImageCapture:: errorString () const

bool QImageCapture:: isAvailable () const

QSize QImageCapture:: resolution () const

void QImageCapture:: setFileFormat ( QImageCapture::FileFormat format )

void QImageCapture:: setMetaData (const QMediaMetaData & metaData )

void QImageCapture:: setQuality ( QImageCapture::Quality quality )

void QImageCapture:: setResolution (const QSize & resolution )

void QImageCapture:: setResolution ( int width , int height )

`[read-only]` fileFormat : const FileFormat

`[read-only]` quality : const Quality

`[read-only]` readyForCapture : const bool

`[slot]` int QImageCapture:: capture ()

`[slot]` int QImageCapture:: captureToFile (const QString & file = QString())

`[signal]` void QImageCapture:: errorOccurred ( int id , QImageCapture::Error error , const QString & errorString )

`[signal]` void QImageCapture:: imageAvailable ( int id , const QVideoFrame & frame )

`[signal]` void QImageCapture:: imageCaptured ( int id , const QImage & preview )

`[signal]` void QImageCapture:: imageExposed ( int id )

`[signal]` void QImageCapture:: imageSaved ( int id , const QString & fileName )

`[signal]` void QImageCapture:: readyForCaptureChanged ( bool ready )

`[virtual]` QImageCapture:: ~QImageCapture ()