COM object with events and GUI update

[Wolfgang Thaemelt]

I am using a COM object that fires events. Data I received in the event handler
should be used to update a Tcl/Tk GUI.

To do this I use the following code structure:

events = [list_with_event_information]

class ORSSystemEvents: # event handler
    def OnChanged(self, ChangeType):
       global events
       events.append("ORSSystem OnChanged event " + str(len(events)))
       ...
       return

def update():                     # update main window  - show event info
    global events, ...

    # prepare data for GUI from events list
    ...
    root.update_idletasks()
    root.after(500, update)
    return

ident   = win32com.client.DispatchWithEvents("ORS.Ident",ORSIdentEvents)

# build GUI

root.after(500, update)
root.mainloop()

This code works but seems to be a bit dangerous.

Is there a way to update the GUI directly from the OnChanged event handler? All
my attempts to do this failed.

Can I avoid the use of the after(...) method?

Is there some extended documentation about event firing and handling available?

Thanks for help.

Wolfgang Thaemelt


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