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

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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。