QDBusVariant 类

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>
CMake: find_package(Qt6 REQUIRED COMPONENTS DBus)
target_link_libraries(mytarget PRIVATE Qt6::DBus)
qmake: QT += dbus

公共函数

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

详细描述

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 .

成员函数文档编制

[noexcept] QDBusVariant:: QDBusVariant ()

构造新的 D-Bus 变体。

[explicit] QDBusVariant:: QDBusVariant (const QVariant & variant )

构造新的 D-Bus 变体从给定 Qt variant .

另请参阅 setVariant ().

void QDBusVariant:: setVariant (const QVariant & variant )

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

另请参阅 variant ().

[noexcept] void QDBusVariant:: swap ( QDBusVariant & other )

交换此 QDBusVariant 实例与 other .

QVariant QDBusVariant:: variant () const

将此 D-Bus 变体返回作为 QVariant 对象。

另请参阅 setVariant ().