QDeclarativeNetworkAccessManagerFactory Class Reference · PyQt4 中文文檔

# QDeclarativeNetworkAccessManagerFactory Class Reference ## [[QtDeclarative](index.htm) module] 該QDeclarativeNetworkAccessManagerFactory類創建[QNetworkAccessManager](qnetworkaccessmanager.html)實例一QML引擎。[More...](#details) ### Methods * `__init__ (self)` * `__init__ (self, QDeclarativeNetworkAccessManagerFactory)` * `QNetworkAccessManager create (self, QObject?parent)` * * * ## Detailed Description 該QDeclarativeNetworkAccessManagerFactory類創建[QNetworkAccessManager](qnetworkaccessmanager.html)實例一QML引擎。一個QML引擎使用[QNetworkAccessManager](qnetworkaccessmanager.html)所有網絡接入。通過實施一個工廠，能夠提供QML發動機與定制[QNetworkAccessManager](qnetworkaccessmanager.html)有專門的緩存，代理和cookie的支持情況。實現工廠，子類QDeclarativeNetworkAccessManagerFactory和實現虛擬[create](qdeclarativenetworkaccessmanagerfactory.html#create)（）方法，然后將其用分配給相關的QML引擎[QDeclarativeEngine.setNetworkAccessManagerFactory](qdeclarativeengine.html#setNetworkAccessManagerFactory)（）。注意QML引擎可能創造[QNetworkAccessManager](qnetworkaccessmanager.html)從多個線程實例。正因為如此，本實施[create](qdeclarativenetworkaccessmanagerfactory.html#create)（）方法必須是[reentrant](index.htm)。此外，開發人員應該小心，如果該對象的信號從返回[create](qdeclarativenetworkaccessmanagerfactory.html#create)（）被連接到可能在不同的線程被創建的對象的槽： * The QML engine internally handles all requests, and cleans up any [QNetworkReply](qnetworkreply.html) objects it creates. Receiving the [QNetworkAccessManager.finished](qnetworkaccessmanager.html#finished)() signal in another thread may not provide the receiver with a valid reply object if it has already been deleted. * Authentication details provided to [QNetworkAccessManager.authenticationRequired](qnetworkaccessmanager.html#authenticationRequired)() must be provided immediately, so this signal cannot be connected as a [Qt.QueuedConnection](qt.html#ConnectionType-enum) (or as the default [Qt.AutoConnection](qt.html#ConnectionType-enum) from another thread). 有關信號和線程的詳細信息，請參閱[Threads and QObjects](index.htm)和[Signals and Slots Across Threads](index.htm#signals-and-slots-across-threads)。 * * * ## Method Documentation ``` QDeclarativeNetworkAccessManagerFactory.__init__ (self) ``` ``` QDeclarativeNetworkAccessManagerFactory.__init__ (self, QDeclarativeNetworkAccessManagerFactory) ``` ``` QNetworkAccessManager QDeclarativeNetworkAccessManagerFactory.create (self, QObject?parent) ``` [ 這種方法是抽象的，應在任何子類中重新實現。該_parent_的說法，如果不是沒有，原因_self_通過Qt的，而不是PyQt的擁有。 ](qnetworkaccessmanager.html) [創建并返回一個網絡訪問管理器與指定的_parent_。此方法必須返回一個新的](qnetworkaccessmanager.html)[QNetworkAccessManager](qnetworkaccessmanager.html)比如每次它被稱為。注意：這個方法可能被多個線程調用，因此確保該方法的實現是可重入的。