QAbstractNetworkCache Class▲
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Header: QAbstractNetworkCache
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Network)
target_link_libraries(mytarget PRIVATE Qt6::Network)
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qmake: QT += network
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Inherits: QObject
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Inherited By: QNetworkDiskCache
Detailed Description▲
QAbstractNetworkCache is the base class for every standard cache that is used by QNetworkAccessManager. QAbstractNetworkCache is an abstract class and cannot be instantiated.
See Also▲
See also QNetworkDiskCache
Member Function Documentation▲
[explicit protected] QAbstractNetworkCache::QAbstractNetworkCache(QObject *parent = nullptr)▲
Constructs an abstract network cache with the given parent.
[virtual] QAbstractNetworkCache::~QAbstractNetworkCache()▲
Destroys the cache.
Any operations that have not been inserted are discarded.
See Also▲
See also insert()
[pure virtual] qint64 QAbstractNetworkCache::cacheSize() const▲
Returns the current size taken up by the cache. Depending upon the cache implementation this might be disk or memory size.
In the base class this is a pure virtual function.
See Also▲
See also clear()
[pure virtual] void QAbstractNetworkCache::clear()▲
Removes all items from the cache. Unless there was failures clearing the cache cacheSize() should return 0 after a call to clear.
In the base class this is a pure virtual function.
See Also▲
[pure virtual] QIODevice *QAbstractNetworkCache::data(const QUrl &url)▲
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 nullptr is returned.
In the base class this is a pure virtual function.
See Also▲
[pure virtual] void QAbstractNetworkCache::insert(QIODevice *device)▲
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.
In the base class this is a pure virtual function.
See Also▲
[pure virtual] QNetworkCacheMetaData QAbstractNetworkCache::metaData(const QUrl &url)▲
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.
In the base class this is a pure virtual function.
See Also▲
See also updateMetaData(), data()
[pure virtual] QIODevice *QAbstractNetworkCache::prepare(const QNetworkCacheMetaData &metaData)▲
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 nullptr 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.
In the base class this is a pure virtual function.
See Also▲
See also remove(), updateMetaData(), insert()
[pure virtual] bool QAbstractNetworkCache::remove(const QUrl &url)▲
Removes the cache entry for url, returning true if success otherwise false.
In the base class this is a pure virtual function.