QDBusVariant Class

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

Header: #include <QDBusVariant>
qmake: QT += dbus
Since: Qt 4.2

This class was introduced in Qt 4.2.

Public Functions

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

Detailed Description

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");

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.

Member Function Documentation

QDBusVariant::QDBusVariant(const QVariant &variant)

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

See also setVariant().


Constructs a new D-Bus variant.

void QDBusVariant::setVariant(const QVariant &variant)

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

See also variant().

void QDBusVariant::swap(QDBusVariant &other)

Swaps this QDBusVariant instance with other.

QVariant QDBusVariant::variant() const

Returns this D-Bus variant as a QVariant object.

See also setVariant().