Re: [python-win32] pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)

[Tim Roberts]

Shaik Saleem Basha wrote:

Hi,



My code :

import win32com.client

client = win32com.client.Dispatch('OpcLabs.EasyOpc.DataAccess.EasyDAClient')

value = client.ReadItemValue('','OPCLabs.KitServer.2', 'Demo.Single')

print('value:',value)

I’m using python 3.8.5 32 bit  and also I have installed pywin32 by this command pip install pywin32 but when I execute my coed i’m getting the following error pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)

The most obvious question, of course, is do you actually have the QuickOPC .NET library installed?

Why did you choose the 32-bit Python, instead of the 64-bit Python?

--
Tim Roberts, t...@probo.com
Providenza & Boekelheide, Inc.

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