Re: [DotGNU]Status of cscc and Qt#

[Adam Treat]

On Wednesday 06 November 2002 12:44 am, you wrote:
> Adam Treat wrote:
> > Thanks Rhys!  I am very happy to see that you are a busy bee on -patches
> > :-)
>
> Just cleaning up some loose ends from 0.4.6.
>
> Try it now (from the CVS version of course).
>
> Cheers,
>
> Rhys.

No more problem with Array's but now:

address@hidden:~/dev/qtsharp/src/examples/samples$ ilrun hello.exe
Uncaught exception: System.ArgumentNullException: Argument cannot be null
Parameter name: type
        at System.Activator.CreateInstance(Type, BindingFlags, Binder, 
Object[], CultureInfo, Object[])
        at System.Activator.CreateInstance(Type, BindingFlags, Binder, 
Object[], CultureInfo)
        at Qt.QtSupport.DispatchEvent(IntPtr, String, IntPtr, String)
        at Qt.QWidget.qt_QWidget_show(IntPtr)
        at Qt.QWidget.Show()
        at QtSamples.HelloWorld.Main(String[])

Segmentation fault

The DispatchEvent method looks like this:

private static void DispatchEvent (IntPtr instance, string eventname, IntPtr 
eventinstance, string eventclass)
                {
                        ArrayList array;
                        QObject obj;
                        QEvent ev;
                        Type evtype = Type.GetType ("Qt."+eventclass+",Qt");

                        if ((obj = (QObject)LookupObject (instance)) == null) 
return;

                        try
                        {
                                if ((ev = (QEvent)LookupObject (eventinstance)) 
== null) {
                                        object[] args = new object[] { 
eventinstance };
                                        BindingFlags bflags = 
BindingFlags.Instance | BindingFlags.NonPublic | 
BindingFlags.Public;
                                        ev = Activator.CreateInstance (evtype, 
bflags, null, args, null) as 
QEvent;
                                }

                                // Notify global event handlers first.
                                if ((array = EventList.QEventHandlers 
(eventclass)) != null) {
                                        foreach (Delegate del in array) {
                                                QEventArgs evargs = new 
QEventArgs (eventname, ev);
                                                del.DynamicInvoke (new object[] 
{ obj, evargs });
                                        }
                                }

                                // Notify local event handlers second.
                                if ((array = EventList.QEventHandlers 
(eventname)) != null) {
                                        foreach (Delegate del in array) {
                                                if (ReferenceEquals 
(del.Target, obj))
                                                        del.DynamicInvoke (new 
object[] { ev });
                                        }
                                }
                        }
                        catch (TargetInvocationException e) {
                                throw e.InnerException;
                        }

                        ev.deleted = true; // Qt deletes events for us
                        ev.Dispose ();
                }

I wonder if it isn't a problem with the binding flags.  Perhaps the 
CreateInstance can not find the correct ctor or something.  We had this 
problem with Mono's reflection.

Cheers,

Adam