How to expose a .Net (C#) event to Qt through com interop.

vinayan

I am trying to expose a .Net event to QT using ActiveQT. I am using dumpcpp to convert my .tlb file to QT headers/classes. Here is my C# code.

[ComVisible(true)]
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    [Guid("70417BD8-6A93-4F9E-ABF2-C20CC3D0C2F8")]
    public interface IWeatherEvents
    {
        void WeatherChanged(int x);
    }

[ComVisible(true)]
    [ClassInterface(ClassInterfaceType.None)]
    [ComSourceInterfaces(typeof(IWeatherEvents))]
    [ProgId("DotNetDbLib.WeatherStation")]
    [Guid("ecb8c4cf-e662-49c2-af56-f4ec08ccde63")]
    public class WeatherStation : ServicedComponent, IWeatherStation
    {
        [ComVisible(false)]
        public delegate void WeatherChangedDelegate(int x);

        public event WeatherChangedDelegate WeatherChanged;

        public void CheckWeather()
        {
            WeatherChanged(20);
        }
    }

[ComVisible(true)]
    [Guid("1010AFF8-292F-4D3D-921A-0BA650D1635C")]
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface IWeatherStation
    {
        void CheckWeather();
    }

Posted below is some contents from the generated header file. I do not see any slots here. I was expecting a slot named WeatherChanged(int).

class DOTNETDBLIB_EXPORT WeatherStation : public QAxObject
{
public:
    WeatherStation(QObject *parent = 0)
    : QAxObject(parent)
    {
        setControl("{ecb8c4cf-e662-49c2-af56-f4ec08ccde63}");
    }

    WeatherStation(IRemoteDispatch *iface)
    : QAxObject()
    {
        initializeFrom(iface);
        delete iface;
    }

    WeatherStation(IDisposable *iface)
    : QAxObject()
    {
        initializeFrom(iface);
        delete iface;
    }

    WeatherStation(IManagedObject *iface)
    : QAxObject()
    {
        initializeFrom(iface);
        delete iface;
    }

    WeatherStation(IServicedComponentInfo *iface)
    : QAxObject()
    {
        initializeFrom(iface);
        delete iface;
    }

    WeatherStation(IWeatherStation *iface)
    : QAxObject()
    {
        initializeFrom(iface);
        delete iface;
    }

    /*
    Property ToString
    */
    inline QString ToString() const; //Returns the value of ToString

    /*
    Method CheckWeather
    */
    inline void CheckWeather();

    /*
    Method Dispose
    */
    inline void Dispose();

    /*
    Method Equals
    */
    inline bool Equals(QVariant obj);

    /*
    Method GetComponentInfo
    */
    inline void GetComponentInfo(int& infoMask, QStringList& infoArray);

    /*
    Method GetHashCode
    */
    inline int GetHashCode();

    /*
    Method GetObjectIdentity
    */
    inline void GetObjectIdentity(QString& pBSTRGUID, int& AppDomainID, qlonglong& pCCW);

    /*
    Method GetSerializedBuffer
    */
    inline void GetSerializedBuffer(QString& pBSTR);

    /*
    Method GetType
    */
    inline mscorlib::_Type* GetType();

    /*
    Method RemoteDispatchAutoDone
    */
    inline QString RemoteDispatchAutoDone(QString s);

    /*
    Method RemoteDispatchNotAutoDone
    */
    inline QString RemoteDispatchNotAutoDone(QString s);

// meta object functions
    static const QMetaObject staticMetaObject;
    virtual const QMetaObject *metaObject() const { return &staticMetaObject; }
    virtual void *qt_metacast(const char *);
};

Any guidance will be highly appreciated.