QDBusInterface 类

QDBusInterface 类是远程对象上的接口代理。更多...

头：	#include <QDBusInterface>
qmake:	QT += dbus
Since:	Qt 4.2
继承：	QDBusAbstractInterface

该类在 Qt 4.2 引入。

所有成员列表，包括继承成员

公共函数

	QDBusInterface (const QString & service , const QString & path , const QString & interface = QString(), const QDBusConnection & connection = QDBusConnection::sessionBus(), QObject * parent = nullptr)
virtual	~QDBusInterface ()

详细描述

QDBusInterface is a generic accessor class that is used to place calls to remote objects, connect to signals exported by remote objects and get/set the value of remote properties. This class is useful for dynamic access to remote objects: that is, when you do not have a generated code that represents the remote interface.

Calls are usually placed by using the call () function, which constructs the message, sends it over the bus, waits for the reply and decodes the reply. Signals are connected to by using the normal QObject::connect () function. Finally, properties are accessed using the QObject::property () 和 QObject::setProperty () 函数。

The following code snippet demonstrates how to perform a mathematical operation of "2 + 2" in a remote application called com.example.Calculator , accessed via the session bus.

QDBusInterface remoteApp( "com.example.Calculator", "/Calculator/Operations",
                          "org.mathematics.RPNCalculator" );
remoteApp.call( "PushOperand", 2 );
remoteApp.call( "PushOperand", 2 );
remoteApp.call( "ExecuteOperation", "+" );
QDBusReply<int> reply = remoteApp.call( "PopOperand" );
if ( reply.isValid() )
    printf( "%d", reply.value() );          // prints 4

另请参阅 Qt D-Bus XML 编译器 (qdbusxml2cpp) .

成员函数文档编制

QDBusInterface:: QDBusInterface (const QString & service , const QString & path , const QString & interface = QString(), const QDBusConnection & connection = QDBusConnection::sessionBus(), QObject * parent = nullptr)

Creates a dynamic QDBusInterface object associated with the interface interface on object at path path on service service ，使用给定 connection 。若 interface is an empty string, the object created will refer to the merging of all interfaces found by introspecting that object. Otherwise if interface is not empty, the QDBusInterface object will be cached to speedup further creations of the same interface.

parent is passed to the base class constructor.

If the remote service service is not present or if an error occurs trying to obtain the description of the remote interface interface , the object created will not be valid (see isValid ()).

`[虚拟]` QDBusInterface:: ~QDBusInterface ()

Destroy the object interface and frees up any resource used.