QAbstractNetworkCache ¶

详细描述 ¶

QAbstractNetworkCache is the base class for every standard cache that is used by QNetworkAccessManager . QAbstractNetworkCache is an abstract class and cannot be instantiated.

另请参阅

QNetworkDiskCache

class QAbstractNetworkCache ( [ parent=None ] ) ¶

param parent

QObject

构造抽象网络缓存采用给定 parent .

PySide2.QtNetwork.QAbstractNetworkCache. cacheSize ( ) ¶

返回类型

qint64

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()

PySide2.QtNetwork.QAbstractNetworkCache. clear ( ) ¶

Removes all items from the cache. Unless there was failures clearing the cache cacheSize() should return 0 after a call to clear.

在基类中，这是纯虚函数。

另请参阅

cacheSize() remove()

PySide2.QtNetwork.QAbstractNetworkCache. data ( url ) ¶

参数

url – QUrl

返回类型

QIODevice

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 None 被返回。

在基类中，这是纯虚函数。

另请参阅

metaData() prepare()

PySide2.QtNetwork.QAbstractNetworkCache. insert ( device ) ¶

参数

device – QIODevice

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() and metaData() .

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

prepare() remove()

PySide2.QtNetwork.QAbstractNetworkCache. metaData ( url ) ¶

参数

url – QUrl

返回类型

QNetworkCacheMetaData

Returns the meta data for the url url .

If the url is valid and the cache contains the data for url, a valid QNetworkCacheMetaData 被返回。

在基类中，这是纯虚函数。

另请参阅

updateMetaData() data()

PySide2.QtNetwork.QAbstractNetworkCache. prepare ( metaData ) ¶

参数

metaData – QNetworkCacheMetaData

返回类型

QIODevice

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 None 被返回。

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() insert()

PySide2.QtNetwork.QAbstractNetworkCache. remove ( url ) ¶

参数

url – QUrl

返回类型

bool

Removes the cache entry for url , returning true if success otherwise false.

在基类中，这是纯虚函数。

另请参阅

clear() prepare()

PySide2.QtNetwork.QAbstractNetworkCache. updateMetaData ( metaData ) ¶

参数

metaData – QNetworkCacheMetaData

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。

另请参阅

metaData() prepare()