QDBusVariant Class

The QDBusVariant class enables the programmer to identify the variant type provided by the D-Bus typesystem. 更多...

头文件:	#include <QDBusVariant>
qmake:	QT += dbus
开始支持版本:	Qt 4.2

所有的成员列表, 包括继承的成员

公有函数

	QDBusVariant()
	QDBusVariant(const QVariant &variant)
	QDBusVariant(QVariant &&v)
void	setVariant(const QVariant &variant)
void	swap(QDBusVariant &other)
QVariant	variant() const

详细描述

The QDBusVariant class enables the programmer to identify the variant type provided by the D-Bus typesystem.

A D-Bus function that takes an integer, a D-Bus variant and a string as parameters can be called with the following argument list (see QDBusMessage::setArguments()):


      QList<QVariant> arguments;
      arguments << QVariant(42) << QVariant::fromValue(QDBusVariant(43)) << QVariant("hello");
      myDBusMessage.setArguments(arguments);

When a D-Bus function returns a D-Bus variant, it can be retrieved as follows:


      // call a D-Bus function that returns a D-Bus variant
      QVariant v = callMyDBusFunction();
      // retrieve the D-Bus variant
      QDBusVariant dbusVariant = qvariant_cast<QDBusVariant>(v);
      // retrieve the actual value stored in the D-Bus variant
      QVariant result = dbusVariant.variant();

The QVariant within a QDBusVariant is required to distinguish between a normal D-Bus value and a value within a D-Bus variant.

参见 The Qt D-Bus Type System.

成员函数

QDBusVariant::QDBusVariant()

Constructs a new D-Bus variant.

QDBusVariant::QDBusVariant(const QVariant &variant)

Constructs a new D-Bus variant from the given Qt variant.

参见 setVariant().

QDBusVariant::QDBusVariant(QVariant &&v)

Default constructs an instance of QDBusVariant.

void QDBusVariant::setVariant(const QVariant &variant)

Assigns the value of the given Qt variant to this D-Bus variant.

参见 variant().

void QDBusVariant::swap(QDBusVariant &other)

QVariant QDBusVariant::variant() const

Returns this D-Bus variant as a QVariant object.