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                # QDBusInterface Class Reference ## [[QtDBus](index.htm) module] 該QDBusInterface類是對遠程對象接口的代理。[More...](#details) 繼承[QDBusAbstractInterface](qdbusabstractinterface.html)。 ### Methods * `__init__ (self, QString?service, QString?path, QString?interface?=?QString(), QDBusConnection?connection?=?QDBusConnection.sessionBus(), QObject?parent?=?None)` * * * ## Detailed Description 該QDBusInterface類是對遠程對象接口的代理。 QDBusInterface是用來放置調用遠程對象,連接到遠程對象導出的信號,并獲取/設置遠程屬性值的通用方法類。這個類是動態訪問遠程對象很有用:即當你沒有一個生成代碼,表示該遠程接口。 呼叫通常放置使用[call](qdbusabstractinterface.html#call)( )函數,它構造消息,發送過來的大巴,等待答復和解碼的答復。信號是通過使用正常連接到[QObject.connect](qobject.html#connect)()函數。最后,屬性是使用訪問[QObject.property](qobject.html#property)()和[QObject.setProperty](qobject.html#setProperty)()函數。 下面的代碼片斷演示了如何執行數學運算`"2 + 2"`在所謂的遠程應用程序`com.example.Calculator`通過會話總線,訪問。 ``` QDBusInterface remoteApp( "com.example.Calculator", "/Calculator/Operations", "org.mathematics.RPNCalculator" ); remoteApp.call( "PushOperand", 2 ); remoteApp.call( "PushOperand", 2 ); remoteApp.call( "ExecuteOperation", "+" ); [QDBusReply](qdbusreply.html)<int> reply = remoteApp.call( "PopOperand" ); if ( reply.isValid() ) printf( "%d", reply.value() ); // prints 4 ``` * * * ## Method Documentation ``` QDBusInterface.__init__ (self, QString?service, QString?path, QString?interface?=?QString(), QDBusConnection?connection?=?QDBusConnection.sessionBus(), QObject?parent?=?None) ``` 創建一個動態[QDBusInterface](qdbusinterface.html)與接口相關聯的對象_interface_在對路徑物件_path_對服務_service_,使用給定的_connection_。如果_interface_是一個空字符串,創建的對象將引用該對象中找到的所有接口的合并。 _parent_傳遞給基類構造函數。 如果該遠程服務_service_不存在,或者如果發生錯誤試圖獲取遠程接口的描述_interface_,創建的對象將是無效的(見[isValid](qdbusabstractinterface.html#isValid)())。
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