[python-win32] Accessing methods from python-based COM DLL generated using py2exe

[Alexis Ellis]

As a note, I have read that I should be using ctypes instead of calldll, but am not sure how to implement that change.

________________________________________
From: python-win32-bounces+aellis02=syr.edu at python.org [python-win32-bounces+aellis02=syr.edu at python.org] on behalf of Alexis Ellis [aellis02 at syr.edu]
Sent: Friday, May 04, 2012 11:07 AM
To: Tim Roberts; Python-Win32 List
Subject: Re: [python-win32] Accessing methods from python-based COM DLL generated using py2exe

Tim,
Thank you for your help.  I was obviously headed down the wrong path.
As per your suggestion, I am now using comtypes to create a com server.
I have generated a tlb and am trying to use comtypes.client.GetModule to generate a wrapper and register the COM (see myserver.py below).
However, when I try do to this using the following command:
>>python myserver.py /regserver

I get the following error:

Traceback (most recent call last):
  File "myserver.py", line 23, in <module>
    import win32com.server.register
  File "c:\python26\arcgis10.0\lib\site-packages\win32com\server\register.py", l
ine 13, in <module>
    import winerror
  File "c:\python26\arcgis10.0\winerror.py", line 3, in <module>
    from nterror import *
  File "c:\python26\arcgis10.0\nterror.py", line 4, in <module>
    import windll
  File "c:\python26\arcgis10.0\windll.py", line 20, in <module>
    import calldll
ImportError: No module named calldll

I do not have a module named calldll and can not find one online (other than for python2.4 - I am using 2.6.5).
Not sure how to address this.  Any help would be greatly appreciated!
Thanks,
Alexis

The following is my wrapper/registration code:
myserver.py
/////////////////////////////////
import comtypes
import comtypes.server.localserver
from comtypes.client import GetModule
# generate wrapper code for the type library, this needs
# to be done only once (but also each time the IDL file changes)
GetModule("comcreate.tlb")
from comtypes.gen.MyTypeLib import MyObject
class MyObjectImpl(MyObject):
    # registry entries
    _reg_threading_ = "Both"
    _reg_progid_ = "MyTypeLib.MyObject.1"
    _reg_novers_progid_ = "MyTypeLib.MyObject"
    _reg_desc_ = "Simple COM server for testing"
    _reg_clsctx_ = comtypes.CLSCTX_INPROC_SERVER | comtypes.CLSCTX_LOCAL_SERVER
    _regcls_ = comtypes.server.localserver.REGCLS_MULTIPLEUSE
#register is a module-level function
def register():
    import win32com.server.register
    win32com.server.register.UseCommandLine(MyObjectImpl)
if __name__ == "__main__":
    register()
//////////////////////////////////////////////

________________________________________
From: python-win32-bounces+aellis02=syr.edu at python.org [python-win32-bounces+aellis02=syr.edu at python.org] on behalf of Tim Roberts [timr at probo.com]
Sent: Thursday, May 03, 2012 1:19 PM
To: Python-Win32 List
Subject: Re: [python-win32] Accessing methods from python-based COM DLL generated using py2exe

Ellis, Alexis -FS wrote:
>
>
>
> am trying to generate a DLL from a python script that can be accessed
> from a variety other programming platforms.
>
> I am generating the python-based COM DLL using a distutils setup
> script that is called using py2exe.
>
> The DLL is successfully generated and I can register it using
> regsvr32, but now I am not sure how to access the function within the dll.
>

Well, you have not actually created a COM server here.  What you have
registered is an empty COM server that defines no methods.  You haven't
actually used any methods from comtypes or comtypes.client at all.

You need to read the documentation for comtypes.server.  You have to
create an IDL file (Interface Description Language) that defines the
methods you expect to expose.  You compile that IDL to a type library
(TLB).  Then, you use comtypes.client.GetModule to generate a wrapper
for that IDL.  Then, your "testscript" module must derive from that
class, and implement the methods you declared.

comtypes creates an "early binding" COM server.  Depending on the
languages you want to use, you might find it easier to create a "late
binding" server using Pythoncom, as described here:
    http://showmedo.com/videotutorials/video?name=2190050&fromSeriesID=219

No IDL is required with this method.

--
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.

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