Re: [python-win32] Making a COM server that accepts COM objects
I changed to an InProcess server, which doesn't seem to work any better or
worse than the LocalServer. Here's the trace:
---
Object with win32trace dispatcher created (object=None)
in ._QueryInterface_ with unsupported
IID b'IPersistStreamInit' ({7FD52380-4E07-101B-AE2D-08002B2EC713})
in ._QueryInterface_ with unsupported
IID b'IPersistPropertyBag' ({37D84F60-42CB-11CE-8135-00AA004BB851})
in _GetIDsOfNames_ with '('Barney',)' and '1033'
in _Invoke_ with 1001 1033 3 (, )
Traceback (most recent call last):
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\dispatcher.py",
line 47, in _Invoke_
return self.policy._Invoke_(dispid, lcid, wFlags, args)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\policy.py",
line 278, in _Invoke_
return self._invoke_(dispid, lcid, wFlags, args)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\policy.py",
line 283, in _invoke_
return S_OK, -1, self._invokeex_(dispid, lcid, wFlags, args, None, None)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\policy.py",
line 586, in _invokeex_
return func(*args)
File "C:\Users\rdboylan\Documents\Wk devel\BSTImport.py", line 37, in Barney
rst = fedb.OpenRecordset("foo")
AttributeError: 'PyIDispatch' object has no attribute 'OpenRecordset'
pythoncom error: Python error invoking COM method.
Traceback (most recent call last):
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\dispatcher.py",
line 163, in _Invoke_
return DispatcherBase._Invoke_(self, dispid, lcid, wFlags, args)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\dispatcher.py",
line 49, in _Invoke_
return self._HandleException_()
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\dispatcher.py",
line 47, in _Invoke_
return self.policy._Invoke_(dispid, lcid, wFlags, args)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\policy.py",
line 278, in _Invoke_
return self._invoke_(dispid, lcid, wFlags, args)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\policy.py",
line 283, in _invoke_
return S_OK, -1, self._invokeex_(dispid, lcid, wFlags, args, None, None)
File
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\policy.py",
line 586, in _invokeex_
return func(*args)
File "C:\Users\rdboylan\Documents\Wk devel\BSTImport.py", line 37, in Barney
rst = fedb.OpenRecordset("foo")
AttributeError: 'PyIDispatch' object has no attribute 'OpenRecordset'
---
To try to ensure that the old LocalServer wasn't active I did --unregister
first, and restarted the calling program after that.
I first tried commenting out
#_reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
when that didn't work I renamed the registry key LocalServer32 (I think; it's
gone now) to NoLocalServer32. when that didn't work I set
_reg_clsctx_ = pythoncom.CLSCTX_INPROC_SERVER
and did the unregister/register, verifying there was no reference to the local
server in the registry after.
Ross
From: python-win32 on
behalf of Tim Roberts
Sent: Wednesday, January 9, 2019 10:05:53 AM
To: Python-Win32 List
Subject: Re: [python-win32] Making a COM server that accepts COM objects
Boylan, Ross wrote:
> I have a Python 3.7, 32 bit, COM server and am calling it from 32 bit Office
> 2010 in VBA. I am attempting to pass some COM objects from VBA to Python.
> The trace collector full output appears below, but I think the key clues are
> several messages like
>
> in ._QueryInterface_ with
> unsupported IID {0003---C000-0046}
> ({0003---C000-0046})
Those are not important. The COM framework is just probing to find out
what extras you support. 0003-etc is IMarshal and 001B-etc is
IStandardMarshal; both can be used to help in the RPC process.
> and, later,
> rst = fedb.OpenRecordset("foo")
> AttributeError: 'PyIDispatch' object has no attribute 'OpenRecordset'
You can't just pass an Access database object to another process and
expect it to work. The support pieces aren't there. Thus, the crux of
your problem is this:
> _reg_progid_ = "Fahy.BST"
> # for unknown reasons the inprocess serv
Re: [python-win32] Making a COM server that accepts COM objects
Boylan, Ross wrote:
I have a Python 3.7, 32 bit, COM server and am calling it from 32 bit Office
2010 in VBA. I am attempting to pass some COM objects from VBA to Python. The
trace collector full output appears below, but I think the key clues are
several messages like
in ._QueryInterface_ with unsupported
IID {0003---C000-0046} ({0003---C000-0046})
Those are not important. The COM framework is just probing to find out
what extras you support. 0003-etc is IMarshal and 001B-etc is
IStandardMarshal; both can be used to help in the RPC process.
and, later,
rst = fedb.OpenRecordset("foo")
AttributeError: 'PyIDispatch' object has no attribute 'OpenRecordset'
You can't just pass an Access database object to another process and
expect it to work. The support pieces aren't there. Thus, the crux of
your problem is this:
_reg_progid_ = "Fahy.BST"
# for unknown reasons the inprocess server isn't working
_reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
That's the problem you need to chase. You need to be an in-process
server if you want to share state with the original code. What happens
when you register yourself as in-process? Note that the registry has to
look different for this.
--
Tim Roberts, t...@probo.com
Providenza & Boekelheide, Inc.
smime.p7s
Description: S/MIME Cryptographic Signature
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[python-win32] Making a COM server that accepts COM objects
I have a Python 3.7, 32 bit, COM server and am calling it from 32 bit Office
2010 in VBA. I am attempting to pass some COM objects from VBA to Python. The
trace collector full output appears below, but I think the key clues are
several messages like
in ._QueryInterface_ with unsupported
IID {0003---C000-0046}
({0003---C000-0046})
and, later,
rst = fedb.OpenRecordset("foo")
AttributeError: 'PyIDispatch' object has no attribute 'OpenRecordset'
I think this means that the objects passed in have unrecognized types, and
therefore type-specific methods don't work on them (though it seems odd they
aren't dynamically dispatched).
What can I do to fix or debug this?
Based on this theory, I used the makepy tool from the GUI to import the DAO 3.6
library, which I believe defines both types. But this didn't seem to help. I
found some documentation saying to use win32com.client.Dispatch to get the
right interface--it also mentioned that the IDispatch object would only repond
to the 2 methods it knows--but I don't know how. All the examples I've seen
with Dispatch use it to create a new object. I can't find any documentation on
it (as opposed to tutorials illustratin it use); I think
com\win32com\client\__init__.py has the relevant definition in the source code,
but it is not apparent to me whether handing it an IDispatch object rather
"Company.Class" will cause the appropriate object to be created.
Running on 64 bit Win 7, with quite a few installations of versions of Python
floating around. Using a LocalServer because of earlier problems with in
process servers. In particular, the invoking path in the registry for my class
is
C:\PROGRA~2\PYTHON~1\pythonw.exe
"C:\Users\rdboylan\AppData\Roaming\Python\Python37\site-packages\win32com\server\localserver.py"
even though I just installed pywin32 and it said it was putting things under
"c:\Program Files (x86)". Both locations (with suitable additions to the
Program Files path) have localserver.py
--- test code in VBA
Public Function medium()
Dim srv As Object
Set srv = CreateObject("Fahy.BST")
medium = srv.Barney(DBEngine.Workspaces(0), CurrentDb())
End Function
-
python server code BSTImport.py
---
import atexit, csv, sys
import pythoncom, win32com.client
from win32com.server.exception import COMException
from win32com.client import constants
from win32com.server.register import UseCommandLine
TmpTable = "aatmpt_bst" # table to import csv into
#pdb.set_trace()
# fields in csv file I use now are
# 'Sample Barcode', 'Participant ID', 'Initials', 'Visit ID',
# 'Collection Date', 'Sample Type', 'Site Comment',
# 'Shipment Comment', 'Shipment ID
# BST Import already name of form in VB
class BSTImport:
# COM Support
_public_methods_ = ['Fred', 'Barney']
_reg_clsid_ = "{050321C2-9B99-4CD0-B5E9-B636DFD94C4D}"
_reg_desc_ = "BST Test Com Server in Python 32 bit"
_reg_progid_ = "Fahy.BST"
# for unknown reasons the inprocess server isn't working
_reg_clsctx_ = pythoncom.CLSCTX_LOCAL_SERVER
def Barney(self, ws, fedb):
"""ws is the workspace with which a transaction has already been
initiated
fedb is the database used by the frontend"""
rst = fedb.OpenRecordset("foo")
rst.AddNew()
fld = rst("foolish")
fld.Value = "python.Barney"
rst.Update()
rst.Close()
rst = None
return True
# other methods omitted
if __name__ == "__main__":
UseCommandLine(BSTImport)
---
--- trace
-
Object with win32trace dispatcher created (object=None)
in ._QueryInterface_ with unsupported
IID {0003---C000-0046}
({0003---C000-0046})
in ._QueryInterface_ with unsupported
IID {001B---C000-0046}
({001B---C000-0046})
in ._QueryInterface_ with unsupported
IID {0018---C000-0046}
({0018---C000-0046})
in ._QueryInterface_ with unsupported
IID b'IExternalConnection' ({0019---C000-0046})
in ._QueryInterface_ with unsupported
IID {4C1E39E1-E3E3-4296-AA86-EC938D896E92}
({4C1E39E1-E3E3-4296-AA86-EC938D896E92})
in ._QueryInterface_ with unsupported
IID b'IPersistStreamInit' ({7FD52380-4E07-101B-AE2D-08002B2EC713})
in ._QueryInterface_ with unsupported
IID b'IPersistPropertyBag' ({37D84F60-42CB-11CE-8135-00AA004BB851})
in ._QueryInterface_ with unsupported
IID {1C733A30-2A1C-11CE-ADE5-00AA0044773D}
({1C733A30-2A1C-11CE-ADE5-00AA0044773D})
in _GetIDsOfNames_ with '('Barney',)' and '1033'
i
