Portable Python com server using pywin32

Question

Is it possible to run comserver without requiring elevation.

For example I am able to run code from Python.TestServer (below) but it requires elevation.

Python.TestServer code is at: Consuming Python COM Server from .NET

Is it possible to run com server which doesn't require elevation so that I can run com object without having Administrative password.

for example

import pythoncom
from win32com.server import localserver

class demoObj(object):
    _reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
    _reg_clsid_ = "{FA501660-8BB0-42F6-842B-A757FA3098DC}"
    _reg_desc_ = "Demo COM server"
    _reg_progid_ = "Python.Demo"
    _public_methods_ = ['hello']

def hello(self, who):
    return "Hellow " + who

localserver.serve('B83DD222-7750-413D-A9AD-01B37021B24B')

I have tried above code but it says pywintypes.com_error: (-2147221005, 'Invalid class string', None, None)

how to make the valid class string for local server?

Example vba :

Sub demodemo()
    Set obj = CreateObject("Python.Demo")
    Debug.Print obj.Hello("World")
End Sub

The Com server will be consumed by VBA. What is your problem with vba? — Rahul
– Rahul, Commented Feb 2, 2017 at 4:23
Out of curiosity, what are you trying to do? I know that in vba there are other alternatives to link excel and python — Kelvin
– Kelvin, Commented Feb 15, 2017 at 18:53
Sorry for late reply as I was on vacation! I want to use python for Microsoft Word and not excel. I tried import xlwings as xw; xw.serve() but I don't know how to use that from vba (word). — Rahul
– Rahul, Commented Feb 16, 2017 at 12:22
I have several other potential consumers of Python code, so COM is the best choice at least for me. I don't want to shell out, rather use variant arguments and results and not files. xlwings and pyxll and fiends won't do, not necessarily xl. — Bill Early
– Bill Early, Commented Jul 8, 2023 at 20:33

Florent B. · Accepted Answer · 2019-07-05 12:32:24Z

It's possible to register and use a class without privileges. The class has to be registered in the current user instead of all users. The option is not provided, so you'll have to register it yourself by writing the keys in HKCU\SOFTWARE\Classes.

Here's a working example:

import os, sys, win32api, win32con, win32com.server.register

class HelloWorld(object):
  _reg_progid_ = "Python.TestServer"
  _reg_clsid_ = "{7CC9F362-486D-11D1-BB48-0000E838A65F}"
  _reg_desc_ = "Python Test COM Server"
  _public_methods_ = ['Hello']

  def Hello(self):
    return "Hello!"



def RegisterClass(cls):
  file = os.path.abspath(sys.modules[cls.__module__].__file__)
  folder = os.path.dirname(file)
  module = os.path.splitext(os.path.basename(file))[0]
  python = win32com.server.register._find_localserver_exe(1)
  python = win32api.GetShortPathName(python)
  server = win32com.server.register._find_localserver_module()
  command = '%s "%s" %s' % (python, server, cls._reg_clsid_)
  typename = module + "." + cls.__name__

  def write(path, value):
    win32api.RegSetValue(win32con.HKEY_CURRENT_USER, path, win32con.REG_SZ, value)

  write("SOFTWARE\\Classes\\" + cls._reg_progid_ + '\\CLSID', cls._reg_clsid_)
  write("SOFTWARE\\Classes\\AppID\\" + cls._reg_clsid_, cls._reg_progid_)
  write("SOFTWARE\\Classes\\CLSID\\" + cls._reg_clsid_, cls._reg_desc_)
  write("SOFTWARE\\Classes\\CLSID\\" + cls._reg_clsid_ + '\\LocalServer32', command)
  write("SOFTWARE\\Classes\\CLSID\\" + cls._reg_clsid_ + '\\ProgID', cls._reg_progid_)
  write("SOFTWARE\\Classes\\CLSID\\" + cls._reg_clsid_ + '\\PythonCOMPath', folder)
  write("SOFTWARE\\Classes\\CLSID\\" + cls._reg_clsid_ + '\\PythonCOM', typename)
  write("SOFTWARE\\Classes\\CLSID\\" + cls._reg_clsid_ + '\\Debugging', "0")

  print("Registered %s" % cls.__name__)

if __name__ == '__main__':
  RegisterClass(HelloWorld)

Seems like working. Sorry For Being Late To Reply. I Was On Vacation

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