qRegisterMetaType() : QMap<QString,long long int>

[ODБOï]

Hi,
I'm trying to pass

QMap<QString,long long unsigned int>
or 
QHash<QString,long long unsigned int>

from one class to another using Signal/Slot but i have this output :

QObject::connect: Cannot queue arguments of type 'QMap<QString,long long unsigned int>'
(Make sure 'QMap<QString,long long unsigned int>' is registered using qRegisterMetaType().)

I googled this and found some related topics but can't really understand when/where/how to register my QMap, can someone put me on the right track please ?

I also wonder if there is another simple method to exchange(using signal/slot) a pair of values (Qstring name, int size)

Thx in advance

[VRonin]

@LeLev said in qRegisterMetaType() : QMap<QString,long long int>:

when/where/how to register my QMap

When: when you need to pass arguments to a queued connection or to enable creation of objects at run-time
Where: before using any of the above. Normally it's done directly in the main()
How: Just call qRegisterMetaType<QMap<QString,long long unsigned int> >();

I also wonder if there is another simple method to exchange(using signal/slot) a pair of values (Qstring name, int size)

QPair<QString,int>

[ODБOï]

@VRonin thank you very much.

[ODБOï]

I tought i was good to go with @VRonin s answer but after putting

qRegisterMetaType<QMap<QString,long long unsigned int> >()

in my main.cpp or just before the QObject::connect i still have the same error output when the signal is emitted;

[jsulm]

@LeLev said in qRegisterMetaType() : QMap<QString,long long int>:

in my main.cpp

Where exactly? Inside main function?

[J.Hilk]

@LeLev
I believe, to pass qRegisterMetaType via QueuedConnection you have to register it with a name:
qRegisterMetaType<MyClass>("MyClass");

[ODБOï]

hi;
@jsulm said in qRegisterMetaType() : QMap<QString,long long int>:

Where exactly? Inside main function?

I tryed before the engine.load , after it, before object creation, after..

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
  //    qRegisterMetaType<QMap<QString,long long unsigned int> >();
    Machine m;
    SysLogTest logger;
    Sftp_user sftp;
//      qRegisterMetaType<QMap<QString,long long unsigned int> >();
    QQmlApplicationEngine engine;

    engine.rootContext()->setContextProperty("sftp",&sftp);
    engine.rootContext()->setContextProperty("machine",&m);
    engine.rootContext()->setContextProperty("logger",&logger);

//      qRegisterMetaType<QMap<QString,long long unsigned int> >();
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
//       qRegisterMetaType<QMap<QString,long long unsigned int> >();
    if (engine.rootObjects().isEmpty())
        return -1;
    return app.exec();
}

[ODБOï]

hello,
@J.Hilk said in qRegisterMetaType() : QMap<QString,long long int>:

I believe, to pass qRegisterMetaType via QueuedConnection you have to register it with a name:

Sorry i don't understand. The error i have is :
Make sure 'QMap<QString,long long unsigned int>' is registered using qRegisterMetaType().

if i do what you suggested :

qRegisterMetaType<MyClass>("MyClass");

output >>>

C:\Qt\5.11.0\mingw53_32\include\QtCore\qobject.h:449: erreur : 'QObject::QObject(const QObject&)' is private
     Q_DISABLE_COPY(QObject)
                    ^

[J.Hilk]

@LeLev
An excerpt from my latest project, maybe it will help you.
QVector<quint16>, uint32_t, int32_, uint8_t and TerminalIO::serviceErrors & QModbusDevice::Error( both enumerations) are passed Queued via Signal/Slot

int main(int argc, char *argv[])
{
    qRegisterMetaType<QVector<quint16> >("QVector<quint16>");
    qRegisterMetaType<Datagram>();
    qRegisterMetaType<QLowEnergyDescriptor>();
    qRegisterMetaType<QLowEnergyCharacteristic>();
    qRegisterMetaType<TerminalIO::serviceErrors>("serviceErrors");
    qRegisterMetaType<uint32_t>("uint32_t");
    qRegisterMetaType<int32_t>("int32_t");
    qRegisterMetaType<uint8_t>("uint8_t");

#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
    qRegisterMetaType<QModbusDevice::Error>("Error");
#endif

    QGuiApplication app(argc, argv);

...
     QQmlApplicationEngine engine;
...
     engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

return app.exec();
}

[ODБOï]

@J.Hilk Perfect thx!
this worked

qRegisterMetaType<QMap<QString,long long unsigned int> >("QMap<QString,long long unsigned int>");