Consuming Python COM Server from .NET

Question

I wanted to implement python com server using win32com extensions. Then consume the server from within the .NET. I used the following example to implement the com server and

Answer 1

A COM server is just a piece of software (a DLL or an executable) that will accept remote procedure calls (RPC) through a defined protocol. Part of the protocol says that the server must have a unique ID, stored in the Windows' registry. In our case, this means that you have "registered" a server that is not existing. Thus the error (component not found).

So, it should be something like this (as usual, this is untested code!):

import pythoncom

class HelloWorld:
    _reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
    _reg_clsid_ = "{B83DD222-7750-413D-A9AD-01B37021B24B}"
    _reg_desc_ = "Python Test COM Server"
    _reg_progid_ = "Python.TestServer"
    _public_methods_ = ['Hello']
    _public_attrs_ = ['softspace', 'noCalls']
    _readonly_attrs_ = ['noCalls']

    def __init__(self):
        self.softspace = 1
        self.noCalls = 0

    def Hello(self, who):
        self.noCalls = self.noCalls + 1
        # insert "softspace" number of spaces
        return "Hello" + " " * self.softspace + str(who)

if __name__ == '__main__':
    if '--register' in sys.argv[1:]  or '--unregister' in sys.argv[1:]:
        import win32com.server.register
        win32com.server.register.UseCommandLine(HelloWorld)
    else:
        # start the server.
        from win32com.server import localserver
        localserver.serve('B83DD222-7750-413D-A9AD-01B37021B24B')

Then you should run from the command line (assuming the script is called HelloWorldCOM.py):

HelloWorldCOM.py --register
HelloWorldCOM.py

Class HelloWorld is the actual implementation of the server. It expose one method (Hello) and a couple of attributes, one of the two is read-only. With the first command, you register the server; with the second one, you run it and then it becomes available to usage from other applications.

Answer 2

You need run Process Monitor on your C# Executable to track down the file that is not found.