Cannot create Autocad object

[vaish1234567]

I tried the following : from pyautocad import Autocad, APoint acad = Autocad(create_if_not_exists=True) acad.prompt("Hello, Autocad from Python\n")

The following is the error i m getting :

acad.prompt("Hello, Autocad from Python\n")
Hello, Autocad from Python Traceback (most recent call last):
File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\site-packages\pyautocad\api.py", line 62, in app
self._app = comtypes.client.GetActiveObject('AutoCAD.Application', dynamic=True) File"C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\sitepackages\comtypes\client__init__.py", line 173, in GetActiveObject
clsid = comtypes.GUID.from_progid(progid)
File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\site-packages\comtypes\GUID.py", line 78, in from_progid
_CLSIDFromProgID(str(progid), byref(inst))
File "_ctypes/callproc.c", line 918, in GetResult
OSError: [WinError -2147221005] Invalid class string During handling of the above exception, another exception occurred: Traceback (most recent call last):
File "", line 1, in
File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\site-packages\pyautocad\api.py", line 161, in prompt
self.doc.Utility.Prompt(u"%s\n" % text)
File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\site-packages\pyautocad\api.py", line 73, in doc
return self.app.ActiveDocument
File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\site-packages\pyautocad\api.py", line 66, in app
self._app = comtypes.client.CreateObject('AutoCAD.Application', dynamic=True) File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\sitepackages\comtypes\client__init__.py", line 227, in CreateObject
clsid = comtypes.GUID.from_progid(progid)
File "C:\Users\snehal\AppData\Local\Programs\Python\Python36\lib\site-packages\comtypes\GUID.py", line 78, in from_progid
_CLSIDFromProgID(str(progid), byref(inst))
File "_ctypes/callproc.c", line 918, in GetResult
OSError: [WinError -2147221005] Invalid class string

I am using Python3.6 ,Autocad 2016,Windows 8 (64bit). Please provide me the solution. Thank you

[HuangYongfei]

Hi, I also have this problem, Do you solve it?

[k-and-d]

I solved this error by understanding how com types work

When we create an Autocad object using

acad = Autocad()

pyautocad creates an object using comtypes by calling comtypes.client.GetActiveObject('AutoCAD.Application', dynamic=True)

'AutoCAD.Application' is a comtype registered in the windows registry

You should find it under

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AutoCAD.Application

however in the our case when the exception Invalid class string means that the path doesnt exist

So to fix this you may clone AutoCAD.Application registry from another path

HKEY_CURRENT_USER\SOFTWARE\Classes\AutoCAD.Application

Cloning all keys under the AutoCAD.Application from HKEY_CURRENT_USER to HKEY_LOCAL_MACHINE fixed it in my machine

I copied the keys by creating new keys manually in the target location

Just copied one registry key : AutoCAD.Application

AutoCAD.Application:{
CLSID {8B4929F8-076F-4AEC-AFEE-8928747B7AE3}
CurVer AutoCAD.Application.24
}

Using Autocad 2020 and python 2.7