QMediaControl ¶

详细描述 ¶

Media controls provide an interface to individual features provided by a media service. Most services implement a principal control which exposes the core functionality of the service and a number of optional controls which expose any additional functionality.

A pointer to a control implemented by a media service can be obtained using the requestControl() member of QMediaService . If the service doesn’t implement a control it will instead return a null pointer.

QMediaPlayerControl *control = qobject_cast<QMediaPlayerControl *>(
        mediaService->requestControl("org.qt-project.qt.mediaplayercontrol/5.0"));
											

Alternatively if the IId of the control has been declared using Q_MEDIA_DECLARE_CONTROL the template version of requestControl() can be used to request the service without explicitly passing the IId or using qobject_cast() .

QMediaPlayerControl *control = mediaService->requestControl<QMediaPlayerControl *>();
											

Most application code will not interface directly with a media service’s controls, instead the QMediaObject which owns the service acts as an intermediary between one or more controls and the application.

另请参阅

QMediaService QMediaObject

class QMediaControl ( [ parent=None ] ) ¶

param parent

QObject

Constructs a media control with the given parent .