Qt Reference Documentation

QDBusVariant Class Reference

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

 #include <QDBusVariant>

Inherits QVariant (private).

This class was introduced in Qt 4.2.

Public Functions

QDBusVariant ()
QDBusVariant ( const QVariant & variant )
void setVariant ( const QVariant & variant )
QVariant variant () const
  • 45 public functions inherited from QVariant

Additional Inherited Members

  • 3 static public members inherited from QVariant

Detailed Description

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 QtDBus type system.

Member Function Documentation

QDBusVariant::QDBusVariant ()

Constructs a new D-Bus variant.

QDBusVariant::QDBusVariant ( const QVariant & variant )

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

See also setVariant().

void QDBusVariant::setVariant ( const QVariant & variant )

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

See also variant().

QVariant QDBusVariant::variant () const

Returns this D-Bus variant as a QVariant object.

See also setVariant().

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