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 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"
如果我为插槽使用
connect
参数,则QMap<QString, QVariant>
调用成功,并且接收到DBus信号。如果我使用PropertyDictionary
typedef,它将失败。我知道C++,但是我对
moc
魔术并不熟悉,所以希望对您有所帮助。我正在使用Ubuntu repo的Ubuntu 18.04,Qt 5.9.5进行构建,使用
/usr/lib/qt5/bin/moc -I /usr/include/x86_64-linux-gnu/qt5 -I /usr/include/x86_64-linux-gnu/qt5/QtCore -I /usr/include/x86_64-linux-gnu/qt5/QtDBus -I /usr/include/x86_64-linux-gnu/qt5/QtNetwork -i DBusTimezoneApp.cxx -o DBusTimezoneApp.moc
g++ -Wall -Wextra -Wconversion -Werror -pedantic -I /usr/include/x86_64-linux-gnu/qt5 -I /usr/include/x86_64-linux-gnu/qt5/QtCore -I /usr/include/x86_64-linux-gnu/qt5/QtDBus -I /usr/include/x86_64-linux-gnu/qt5/QtNetwork -std=c++17 -fPIC -O0 -g3 -c DBusTimezoneApp.cxx
g++ -o DBusTimezoneApp DBusTimezoneApp.o -l Qt5Core -l Qt5DBus -l Qt5Network
最佳答案
您必须使用 qRegisterMetaType
注册PropertyDictionary:
// ...
qDBusRegisterMetaType<PropertyDictionary>();
qRegisterMetaType<PropertyDictionary>("PropertyDictionary");
// ...
关于c++ - Qt DBus连接不适用于SLOT参数中的typedef,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59517581/