OpenOPC.client() fails with "OPCError: Dispatch: Invalid class string" #14
Description
Please correct my misunderstanding if I am wrong. The README.TXT leads me to believe that this version of OpenOPC is an updated version of the package that was originally described at http://openopc.sourceforge.net/. As such, I think that I should expect the "minimal working program" code to work. Here is an interpreter session with traceback showing that I am failing right from the start:
Python 3.7.4 (default, Aug 9 2019, 18:34:13) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import OpenOPC
>>> OpenOPC.__version__
'1.2.0'
>>> opc = OpenOPC.client()
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\win32com\client\dynamic.py",
line 89, in _GetGoodDispatch
IDispatch = pythoncom.connect(IDispatch)
pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\OpenOPC.py", line 167, in __init__
self._opc = win32com.client.gencache.EnsureDispatch(c, 0)
File "C:\ProgramData\Anaconda3\lib\site-packages\win32com\client\gencache.py",
line 527, in EnsureDispatch
disp = win32com.client.Dispatch(prog_id)
File "C:\ProgramData\Anaconda3\lib\site-packages\win32com\client\__init__.py",
line 95, in Dispatch
dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
File "C:\ProgramData\Anaconda3\lib\site-packages\win32com\client\dynamic.py",
line 114, in _GetGoodDispatchAndUserName
return (_GetGoodDispatch(IDispatch, clsctx), userName)
File "C:\ProgramData\Anaconda3\lib\site-packages\win32com\client\dynamic.py",
line 91, in _GetGoodDispatch
IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx, pythoncom.IID_IDispatch)
pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\ProgramData\Anaconda3\lib\site-packages\OpenOPC.py", line 173, in __init__
raise OPCError(error_msg)
OpenOPC.OPCError: Dispatch: Invalid class string
I'm failing just by attempting to create a client with no arguments. I installed this package from PyPI using pip. Both win32 and pyro4 were installed when I installed OpenOPC.
Advice and suggestions are greatly appreciated, thanks!