QMetaDataReaderControl ¶

详细描述 ¶

若 QMediaService can provide read or write access to the meta-data of its current media it will implement QMetaDataReaderControl . This control provides functions for both retrieving and setting meta-data values. Meta-data may be addressed by the keys defined in the QMediaMetaData 名称空间。

The functionality provided by this control is exposed to application code by the meta-data members of QMediaObject , and so meta-data access is potentially available in any of the media object classes. Any media service may implement QMetaDataReaderControl .

The interface name of QMetaDataReaderControl is org.qt-project.qt.metadatareadercontrol/5.0 作为定义在 QMetaDataReaderControl_iid .

另请参阅

requestControl() QMediaObject

class QMetaDataReaderControl ( [ parent=None ] ) ¶

param parent

QObject

构造 QMetaDataReaderControl with parent . This class is meant as a base class for service specific meta data providers so this constructor is protected.

PySide2.QtMultimedia.QMetaDataReaderControl. availableMetaData ( ) ¶

返回类型

字符串列表

返回元数据的可用键列表。

PySide2.QtMultimedia.QMetaDataReaderControl. isMetaDataAvailable ( ) ¶

返回类型

bool

Identifies if meta-data is available from a media service.

Returns true if the meta-data is available and false otherwise.

PySide2.QtMultimedia.QMetaDataReaderControl. metaData ( key ) ¶

参数

key – unicode

返回类型

object

Returns the meta-data for the given key .

PySide2.QtMultimedia.QMetaDataReaderControl. metaDataAvailableChanged ( available ) ¶

参数

available – bool

PySide2.QtMultimedia.QMetaDataReaderControl. metaDataChanged ( ) ¶

PySide2.QtMultimedia.QMetaDataReaderControl. metaDataChanged ( key , value ) ¶

参数

• key – unicode

• value – object