[python-win32] newby to com and a problem with events

[Seth Sims]

Hi, 

    Does anyone have anything else I can try to fix my problem? I know that events are being fired because of their side effects on the COM object state. However I never see my little print messages from the event handler. I feel like it is just something small that I am missing. Thank you in advance. 

                                      -Seth 

------msrtest.py------- 

from win32com import client 
import pythoncom 
import time 

class OPOSEventSink: 

   def OnDirectIOEvent(self, EventNumber, pData, pString): 
       """method DirectIOEvent""" 
       print "direct io" 

   def OnDataEvent(self, Status): 
       """method DataEvent""" 
       print "data" 

   def OnStatusUpdateEvent(self, Data): 
       """method StatusUpdateEvent""" 
       print "status update" 

   def OnErrorEvent(self, ResultCode, ResultCodeExtended, ErrorLocus, pErrorResponse): 
       """method ErrorEvent""" 
       print "error" 


if __name__ == '__main__': 
   msr = client.DispatchWithEvents("OPOS.MSR", OPOSEventSink) 

   #Ready the device 
   status = msr.Open("Ing6XXX") 

   if status <> 0: 
       print "failed to open msr" 
       quit() 

   status = msr.ClaimDevice(-1) 
   if status <> 0: 
       print "failed to claim msr" 
       quit() 

   #setup the magnetic stripe reader 
   msr.AutoDisable = True          #tell the device to turn its self off when a swipe is read 
   msr.DataEventEnabled = True 
   msr.TracksToRead = 0xf          #read all 4 tracks 

   msr.FreezeEvents = True         #hold events till I say to send them 

   #turn the device on 
   msr.DeviceEnabled = True 

   print "please swipe a card" 
   #when this loop finishes there has been a successful swipe of a card 
   #and a data event is waiting to be released in the com object 
   while msr.DataCount < 1: 
       time.sleep(0.5) 

   #by the OPOS specification these attributes are set as blank strings 
   #until a data event is fired 
   print 'before unfreezing events should be blank' 
   print 'Account number:', msr.AccountNumber, '\nName:', msr.Surname, '\n' 

   #release the events 
   msr.FreezeEvents = False 

   print 'events thawed should still be blank' 
   print 'Account number:', msr.AccountNumber, '\nName:', msr.Surname, '\n' 
    
   pythoncom.PumpWaitingMessages() 

   print 'after pump waiting messages now the values should be there' 
   print 'Account number:', msr.AccountNumber, '\nName:', msr.Surname, '\n' 

   timeout = time.time() + 30 

   while time.time() <= timeout: 
       print 'pumping messages' 
       pythoncom.PumpWaitingMessages() 
       time.sleep(0.5) 

   msr.ReleaseDevice() 
   msr.Close() 

---output--- 

please swipe a card 
before unfreezing events should be blank 
Account number: 
Name: 

events thawed should still be blank 
Account number: 
Name: 

after pump waiting messages now the values should be there 
Account number: <card number> 
Name: <name> 

pumping messages 
pumping messages 
pumping messages 
....