The QQmlNetworkAccessManagerFactory class creates QNetworkAccessManager instances for a QML engine. 更多...
头: | #include <QQmlNetworkAccessManagerFactory> |
qmake: | QT += qml |
Since: | Qt 5.0 |
该类在 Qt 5.0 引入。
virtual | ~QQmlNetworkAccessManagerFactory () |
virtual QNetworkAccessManager * | create (QObject * parent ) = 0 |
A QML engine uses QNetworkAccessManager for all network access. By implementing a factory, it is possible to provide the QML engine with custom QNetworkAccessManager instances with specialized caching, proxy and cookies support.
To implement a factory, subclass QQmlNetworkAccessManagerFactory and implement the virtual create () method, then assign it to the relevant QML engine using QQmlEngine::setNetworkAccessManagerFactory ().
Note the QML engine may create QNetworkAccessManager instances from multiple threads. Because of this, the implementation of the create () method must be 可重入 . In addition, the developer should be careful if the signals of the object to be returned from create () are connected to the slots of an object that may be created in a different thread:
For more information about signals and threads, see 线程和 QObject and 信号和槽跨线程 .
另请参阅 Network Access Manager Factory Example .
[虚拟]
QQmlNetworkAccessManagerFactory::
~QQmlNetworkAccessManagerFactory
()
Destroys the factory. The default implementation does nothing.
[pure virtual]
QNetworkAccessManager
*QQmlNetworkAccessManagerFactory::
create
(
QObject
*
parent
)
Creates and returns a network access manager with the specified parent . This method must return a new QNetworkAccessManager instance each time it is called.
Note: this method may be called by multiple threads, so ensure the implementation of this method is reentrant.