Qt DBus连接不适用于SLOT参数中的typedef

Question

我可以使用QDBusConnection::connect和旧式QDBusConnection::connect语法将DBus信号连接到Qt插槽：

SLOT

SLOT调用成功，并且如果我为插槽使用

#pragma GCC diagnostic push
#   pragma GCC diagnostic ignored "-Wconversion"
#   include <QCoreApplication>
#   include <QDBusConnection>
#   include <QDBusMetaType>
#   include <QDebug>
#   include <QMap>
#   include <QString>
#   include <QVariant>
#pragma GCC diagnostic pop

using PropertyDictionary = QMap<QString, QVariant>;
Q_DECLARE_METATYPE(PropertyDictionary)

class MyLogger : public QObject
{
    Q_OBJECT

public slots:

    void log(QString const& interface, QMap<QString, QVariant> const& properties)
    {
        logTypedef(interface, properties);
    }

    void logTypedef(QString const& interface, PropertyDictionary const& properties)
    {
        qDebug() << "interface = " << interface;
        qDebug() << "properties = " << properties;
    }
};

int main(int argc, char* argv[])
{
    qDBusRegisterMetaType<PropertyDictionary>();

    QCoreApplication app{argc, argv};
    MyLogger logger{};
    auto const connected
    {
        QDBusConnection::systemBus().connect
        (
            "org.freedesktop.timedate1",
            "/org/freedesktop/timedate1",
            "org.freedesktop.DBus.Properties",
            "PropertiesChanged",
            &logger,
            // SLOT(log(QString, QMap<QString, QVariant>)) // works
            SLOT(logTypedef(QString, PropertyDictionary)) // assert fails
        )
    };
    Q_ASSERT(connected);

    return app.exec();
}

#include "DBusTimezoneApp.moc"

参数，则会接收到DBus信号。如果使用connect typedef，它将失败。

我知道C ++，但是我对QMap<QString, QVariant>魔术并不熟悉，因此希望对您有所帮助。

我正在使用Ubuntu存储库中的Ubuntu 18.04，Qt 5.9.5进行构建，使用>]

PropertyDictionary

我可以使用QDBusConnection :: connect和旧式SLOT语法将DBus信号连接到Qt插槽：#pragma GCC诊断推送＃pragma GCC诊断已忽略“ -Wconversion”＃include <...>

Answer 1

您必须使用moc注册PropertyDictionary：