// Simple .NET ActiveX which is Raising an event when start() called.
namespace RandomColorGenerator
{
    [ClassInterface(ClassInterfaceType.None), Guid("5E20404E-43FC-4A16-873A-C79D36B99750"), ProgId("RandomColorGenerator.ColorGenerator")]
    public class ColorGenerator : IColorGenerator
    {
        public event EventHandler ColorGenerated;

        public void start()
        {
            EventHandler handler = ColorGenerated;
            if (handler != null)
            {
                handler(this, EventArgs.Empty);
            }
            Console.WriteLine("ColorGenerator::Start");
        }

        public void stop()
        {
            Console.WriteLine("ColorGenerator::Stop");
        }

        public string color()
        {
            return "#00FF00";
        }
    }
}

//Qt Code which is initializing that activeX
    QAxObject *object = new QAxObject("RandomColorGenerator.ColorGenerator");
    //Works fine
    object->dynamicCall("stop()");
    //getting error : Object::connect: No such signal QAxObject::ColorGenerated(IDispatch*)
    QObject::connect(object, SIGNAL(ColorGenerated(IDispatch*)), this, SLOT(onColorGenerated(IDispatch*)));

//dumpcpp tool doc output

Public Slots:

bool Equals(QVariant obj);
int GetHashCode();
mscorlib::_Type* GetType();
void add_ColorGenerated(mscorlib::_EventHandler* value);
QString color();
void remove_ColorGenerated(mscorlib::_EventHandler* value);
void start();
void stop();

Signals:

void exception(int code, QString source, QString disc, QString help);
void propertyChanged(QString name);
void signal(QString name, int argc, void* argv);