The QAbstractNetworkCache class provides the interface for cache implementations. 更多...
继承 QObject .
Inherited by QNetworkDiskCache .
The QAbstractNetworkCache class provides the interface for cache implementations.
QAbstractNetworkCache is the base class for every standard cache that is used be QNetworkAccessManager . QAbstractNetworkCache is an abstract class and cannot be instantiated.
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
构造抽象网络缓存采用给定 parent .
This method is abstract and should be reimplemented in any sub-class.
Returns the current size taken up by the cache. Depending upon the cache implementation this might be disk or memory size.
在基类中，这是纯虚函数。
另请参阅 clear ().
This method is also a Qt slot with the C++ signature void clear() .
This method is abstract and should be reimplemented in any sub-class.
Removes all items from the cache. Unless there was failures clearing the cache cacheSize () 应该 return 0 after a call to clear.
在基类中，这是纯虚函数。
另请参阅 cacheSize () 和 remove ().
This method is abstract and should be reimplemented in any sub-class.
Returns the data associated with url .
It is up to the application that requests the data to delete the QIODevice when done with it.
If there is no cache for url , the url is invalid, or if there is an internal cache error 0 is returned.
在基类中，这是纯虚函数。
另请参阅 metaData () 和 prepare ().
This method is abstract and should be reimplemented in any sub-class.
Inserts the data in device and the prepared meta data into the cache. After this function is called the data and meta data should be retrievable using data () 和 metaData ().
To cancel a prepared inserted call remove () on the metadata's url.
在基类中，这是纯虚函数。
This method is abstract and should be reimplemented in any sub-class.
Returns the meta data for the url url .
If the url is valid and the cache contains the data for url, a valid QNetworkCacheMetaData is returned.
在基类中，这是纯虚函数。
另请参阅 updateMetaData () and data ().
This method is abstract and should be reimplemented in any sub-class.
Returns the device that should be populated with the data for the cache item metaData . When all of the data has been written insert () should be called. If metaData is invalid or the url in the metadata is invalid 0 is returned.
The cache owns the device and will take care of deleting it when it is inserted or removed.
To cancel a prepared inserted call remove () on the metadata's url.
在基类中，这是纯虚函数。
另请参阅 remove (), updateMetaData (), and insert ().
This method is abstract and should be reimplemented in any sub-class.
Removes the cache entry for url , returning true if success otherwise false.
在基类中，这是纯虚函数。
This method is abstract and should be reimplemented in any sub-class.
Updates the cache meta date for the metaData's url to metaData
If the cache does not contains a cache item for the url then no action is taken.
在基类中，这是纯虚函数。
