# This example shows how to obtain current state information for the condition instance corresponding to a Source and # certain ConditionName. import time import win32com.client serverDescriptor = win32com.client.Dispatch('OpcLabs.EasyOpc.ServerDescriptor') serverDescriptor.UrlString = 'opcae://localhost/OPCLabs.KitEventServer.2' sourceDescriptor = win32com.client.Dispatch('OpcLabs.EasyOpc.AlarmsAndEvents.AENodeDescriptor') sourceDescriptor.QualifiedName = "Simulation.ConditionState1" # Instantiate the client object client = win32com.client.Dispatch('OpcLabs.EasyOpc.AlarmsAndEvents.EasyAEClient') print('Getting condition state...') conditionState = client.GetConditionState(serverDescriptor, sourceDescriptor, 'Simulated', []) print('ConditionState:') print(' .ActiveSubcondition: ', conditionState.ActiveSubcondition) print(' .Enabled: ', conditionState.Enabled) print(' .Active: ', conditionState.Active) print(' .Acknowledged: ', conditionState.Acknowledged) print(' .Quality: ', conditionState.Quality) # Note that IAEConditionState has many more properties print() print('Finished.')

# This example shows how to subscribe to events and obtain the notification events by pulling them. import time import win32com.client serverDescriptor = win32com.client.Dispatch('OpcLabs.EasyOpc.ServerDescriptor') serverDescriptor.ServerClass = 'OPCLabs.KitEventServer.2' # Instantiate the client object client = win32com.client.Dispatch('OpcLabs.EasyOpc.AlarmsAndEvents.EasyAEClient') # In order to use event pull, you must set a non-zero queue capacity upfront. client.PullNotificationQueueCapacity = 1000 print('Subscribing events...') subscriptionParameters = win32com.client.Dispatch('OpcLabs.EasyOpc.AlarmsAndEvents.AESubscriptionParameters') subscriptionParameters.NotificationRate = 1000 hanle = client.SubscribeEvents(serverDescriptor, subscriptionParameters, True, None) print('Processing event notifications for 1 minute...') endTime = time.time() + 60 while time.time() < endTime: eventArgs = client.PullNotification(2*1000) if eventArgs is not None: # Handle the notification event print(eventArgs) print('Unsubscribing events...') client.UnsubscribeAllItems() print('Finished.')

import win32com.client import win32com.client.connect import time # import pythoncom class EventHandler: def OnEventingFailure(self, sender0, eventArgs): print(sender0) print(eventArgs) def OnNotification(self, sender0, eventArgs): print(sender0) if eventArgs.Succeeded is not None: print(eventArgs.Message) daclient = win32com.client.Dispatch('OpcLabs.EasyOpc.DataAccess.EasyDAClient') client = win32com.client.Dispatch('OpcLabs.EasyOpc.AlarmsAndEvents.EasyAEClient') serverDescriptor = win32com.client.Dispatch('OpcLabs.EasyOpc.ServerDescriptor') subscriptionParameters = win32com.client.Dispatch('OpcLabs.EasyOpc.AlarmsAndEvents.AESubscriptionParameters') serverDescriptor.Host = 'localhost' serverDescriptor.ServerClass = 'OPCLabs.KitEventServer.2' subscriptionParameters.notificationRate = 1000 handler = win32com.client.WithEvents(client, EventHandler) print("Subscribing events...") handle = client.SubscribeEvents(serverDescriptor, subscriptionParameters, True, None) time.sleep(10) daclient.WriteItemValue('localhost', 'OPCLabs.KitServer.2', 'SimulateEvents.ConditionState1.Activate', True) time.sleep(10) client.RefreshEventSubscription(handle) print("Processing event notifications for 1 minute...") time.sleep(60) print("Unsubscribing events...") if handle is not None: client.UnsubscribeEvents(handle) print("Finished.")