QDBusVariant 类使程序员能够标识由 D-Bus 类型系统提供的变量类型。 更多...
头: | #include <QDBusVariant> |
qmake: | QT += dbus |
Since: | Qt 4.2 |
该类在 Qt 4.2 引入。
QDBusVariant (const QVariant & variant ) | |
QDBusVariant () | |
void | setVariant (const QVariant & variant ) |
void | swap (QDBusVariant & other ) |
QVariant | variant () const |
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.
另请参阅 Qt D-Bus 类型系统 .
构造新的 D-Bus 变体从给定 Qt variant .
另请参阅 setVariant ().
构造新的 D-Bus 变体。
Assigns the value of the given Qt variant to this D-Bus variant.
另请参阅 variant ().
交换此 QDBusVariant 实例与 other .
将此 D-Bus 变体返回作为 QVariant 对象。
另请参阅 setVariant ().