On Friday, March 22, 2013 at 11:43:50 PM UTC+5:30, Jan wrote:
> Dear Usenet readers,
>
> Our company wants to implement about 40 biometric access control devices
> which have a proprietary DLL with a COM object in it.
>
> I've done some research about COM objects and how to use them.
> Now, I need to connect to every device separately and register for real
> time events. So, I need about 40 instances of the COM object
> simultaneously connected and registered to catch all events of all devices.
>
> I assumed I needed threading for this, and I have done a simple
> implementation.
>
> All I want to ask is: Does anybody see something that I could have done
> in a better way? I'm new to COM objects in Python!
>
> The program runs fine, it is very basic and I tested it with 3 devices
> connected at the same time. In production this will be 40!
>
> Thanks in advance
>
> Jan
>
> Source code:
>
> # Based on eventappartmentthreading from the win32com demo
>
> import sys, os, time
> import win32com.client
> import win32api
> import win32event
> # sys.coinit_flags not set, so pythoncom initializes apartment-threaded.
> import pythoncom
> from threading import Thread
>
> threadlist = dict() # this stores the device ids
> # using the threadid as the key field
>
> class ZkEvents:
> def __init__(self):
> self.event = win32event.CreateEvent(None, 0, 0, None)
> thread = win32api.GetCurrentThreadId()
> print "thread %s " % thread
>
> self.dev_id = threadlist[thread]
> print "Thread Connected For ID %s " % self.dev_id
>
> def OnFinger(self):
> print self.dev_id,
> print "OnFinger"
>
> def OnVerify(self, iUserID=pythoncom.Empty):
> print self.dev_id,
> print "OnVerify: %s" % iUserID
>
> def OnKeyPress(self, iKey=pythoncom.Empty):
> print self.dev_id,
> print "KeyPress: %s" % iKey
>
> def WaitWhileProcessingMessages(event, timeout = 60):
> start = time.clock()
> while True:
> # Wake 4 times a second - we can't just specify the
> # full timeout here, as then it would reset for every
> # message we process.
> rc = win32event.MsgWaitForMultipleObjects( (event,), 0,
> 250,
> win32event.QS_ALLEVENTS)
> if rc == win32event.WAIT_OBJECT_0:
> # event signalled - stop now!
> return True
> if (time.clock() - start) > timeout:
> # Timeout expired.
> return False
> # must be a message.
> pythoncom.PumpWaitingMessages()
>
> def TestZkEvents(ip, dev_id):
> thread = win32api.GetCurrentThreadId()
> print 'TestZkEvents created ZK object on thread %d'%thread
> threadlist[thread] = dev_id
>
> pythoncom.CoInitialize()
> zk = win32com.client.DispatchWithEvents("zkemkeeper.ZKEM", ZkEvents)
>
> if zk.Connect_Net(ip, 4370):
> print "Connect %s OK" % ip
> else:
> print "Connect %s Failed" % ip
> try:
> if zk.RegEvent(1, 65535): # 65535 = register for all events
> print "RegEvent %s, %s OK" % (ip, dev_id)
> else:
> print "RegEvent %s, %s Failed" % (ip, dev_id)
> except pythoncom.com_error, details:
> print "Warning - could not open the test HTML file", details
>
> # Wait for the event to be signaled while pumping messages.
> while True:
> if not WaitWhileProcessingMessages(zk.event):
> print "No Events From %s During Last Minute" % dev_id
>
> zk = None
>
> if __name__=='__main__':
> # this should be a for loop with database fields...
> t1 = Thread(target=TestZkEvents, args=('192.168.1.211',40))
> t1.start()
>
> t2 = Thread(target=TestZkEvents, args=('192.168.1.212',45))
> t2.start()
>
> t3 = Thread(target=TestZkEvents, args=('192.168.1.213',49))
> t3.start()
I Found This Error Plz Help,
File "C:\Python27\pyt32\lib\threading.py", line 801, in __bootstrap_inner
self.run()
File "C:\Python27\pyt32\lib\threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "C:\Users\Kasim-SCS\Desktop\hk\zkem\v10_biometric_ERPpeek.py", line 266,
in TestZkEvents
zk = DispatchWithEvents("zkemkeeper.ZKEM", ZkEvents)
File "C:\Python27\pyt32\lib\site-packages\win32com\client\__init__.py", line 2
53, in DispatchWithEvents
disp = Dispatch(clsid)
File "C:\Python27\pyt32\lib\site-packages\win32com\client\__init__.py", line 9
5, in Dispatch
dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch,userName,c
lsctx)
File "C:\Python27\pyt32\lib\site-packages\win32com\client\dynamic.py", line 11
4, in _GetGoodDispatchAndUserName
return (_GetGoodDispatch(IDispatch, clsctx), userName)
File "C:\Python27\pyt32\lib\site-packages\win32com\client\dynamic.py", line 91
, in _GetGoodDispatch
IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx, pythoncom.II
D_IDispatch)
com_error: (-2147221005, 'Invalid class string', None, None)
How To Solve DispatchWithEnvent Error ??
--
https://mail.python.org/mailman/listinfo/python-list
