Hi,
I have encountered a weird problem whan trying a capture events from some
homebrewed COM ( written in Visual Studio 6 ).
Basically using the PythonWin IDE, if I run the code through the debugger with
a breakpoint at the PumpEvents() line, the event is detected ( once I
have stepped through the breakpoint ). If I do not have the breakpoint the
event is not detected.
The code is basically as follows:-
from comtypes.client import CreateObject, GetEvents, PumpEvents
class GCPLCEventSink(object):
def _IPLCEvents_NotificationReceived(self,this,a,NotificationValue):
print("Notification Received")
if __name__ == "__main__":
progid = "XXXXXX.GC_PLC.1
plc = CreateObject(progid)
plc.Connect("10.0.0.2")
sink = GCPLCEventSink()
connection = GetEvents(self.plc, sink)
PumpEvents(10)
The Event that I am detecting is generated externally, I am sure it is
happening when we are blocked on the PumpEvent() call.
When I talk to the COM through Visual Basic the events seem to be detected no
problem. So at least superficially the COM seems OK, though clearly it may
just be VB is just more forgiving of iffy code.
The event section of the IDL file
dispinterface _IPLCEvents
{
properties:
methods:
[id(1), helpstring("method ServerClosed")] HRESULT ServerClosed();
[id(2), helpstring("method NotificationReceived")] HRESULT
NotificationReceived([in] long NotificationValue);
};
I must admit I am not too clear what parameters should be passed to the
_IPLCEvents_NotificationReceived() method.
Any thoughts would be most welcome.
Regards,
Calum....
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