\inmodule QtDBus More...

#include <qdbusextratypes.h>

Collaboration diagram for QDBusVariant:

Public Member Functions
	QDBusVariant () noexcept
	Constructs a new D-Bus variant.

	QDBusVariant (const QVariant &variant)
	Constructs a new D-Bus variant from the given Qt variant.

	QDBusVariant (QVariant &&v) noexcept

void	swap (QDBusVariant &other) noexcept
	Swaps this QDBusVariant instance with other.

void	setVariant (const QVariant &variant)
	Assigns the value of the given Qt variant to this D-Bus variant.

QVariant	variant () const
	Returns this D-Bus variant as a QVariant object.

Detailed Description

\inmodule QtDBus

Since: 4.2

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.

See also: {The Qt D-Bus Type System}

Definition at line 125 of file qdbusextratypes.h.

Constructor & Destructor Documentation

◆ QDBusVariant() [1/3]

QDBusVariant::QDBusVariant ( )

inlinenoexcept

Constructs a new D-Bus variant.

Definition at line 129 of file qdbusextratypes.h.

◆ QDBusVariant() [2/3]

QDBusVariant::QDBusVariant ( const QVariant & variant )

inlineexplicit

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

See also: setVariant()

Definition at line 145 of file qdbusextratypes.h.

◆ QDBusVariant() [3/3]

QDBusVariant::QDBusVariant ( QVariant && v )

inlineexplicitnoexcept

Definition at line 134 of file qdbusextratypes.h.

Member Function Documentation

◆ setVariant()

void QDBusVariant::setVariant ( const QVariant & variant )

inline

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

See also: variant()

Definition at line 148 of file qdbusextratypes.h.

◆ swap()

void QDBusVariant::swap ( QDBusVariant & other )

inlinenoexcept

Swaps this QDBusVariant instance with other.

Definition at line 136 of file qdbusextratypes.h.

References other(), and QVariant::swap().

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◆ variant()

QVariant QDBusVariant::variant ( ) const

inline

Returns this D-Bus variant as a QVariant object.

See also: setVariant()

Definition at line 140 of file qdbusextratypes.h.

Referenced by QXdgDesktopPortalTheme::QXdgDesktopPortalTheme(), main(), operator>>(), operator>>(), and QDBusAbstractInterfaceBase::qt_metacall().

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The documentation for this class was generated from the following files:

qtbase/src/dbus/qdbusextratypes.h
qtbase/src/dbus/qdbusextratypes.cpp

Public Member Functions