Plain implementation of virtual table for event notification from COM

[Sunbreak]

Background

I'm trying Dart callback within connectivity_windows, via IConnectionPoint Advise/Unadvise

https://github.com/Sunbreak/plugins/blob/6b6b2b0f82bc677228c5a3f2338281e1a9a7f878/packages/connectivity/connectivity_windows/lib/connectivity_windows.dart

NetworkListManagerEvents eventsSink = NetworkListManagerEvents.createInstance();
connectionPoint.Advise(eventsSink.ptr, cookiePtr);
// ...
eventsSession.connectionPoint.Unadvise(eventsSession.cookie);

Problem

I'm stuck with native crash at https://github.com/Sunbreak/plugins/blob/6b6b2b0f82bc677228c5a3f2338281e1a9a7f878/packages/connectivity/connectivity_windows/lib/interface_windows.dart#L46

ptr.ref.lpVtbl.value = eventsVtblPtr.address;

Expect

According to COMObject and IUnknown implementation, ptr.ref.lpVtbl.value = eventsVtblPtr.address; should be OK

https://github.com/timsneath/win32/blob/529b3c02accf6da255c342f89ab6f24b22cc263c/lib/src/combase.dart#L21-L25

https://github.com/timsneath/win32/blob/529b3c02accf6da255c342f89ab6f24b22cc263c/lib/src/com/IUnknown.dart#L43-L46

[Sunbreak]

Hope Flutter repo would open up Discussions some day