[pywin32-bugs] [ pywin32-Bugs-1295741 ] win32com: Lotus Notes IDocument.Authors crashes python

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Bugs item #1295741, was opened at 2005-09-20 05:45
Message generated for change (Comment added) made by mhammond
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Category: com
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Philip Reed (philipreed)
Assigned to: Nobody/Anonymous (nobody)
Summary: win32com: Lotus Notes IDocument.Authors crashes python 

Initial Comment:
Sorry in advance for a Notes-specific question, but I'm 
guessing Notes is just the stimulus that's provoking 
some kind of issue in win32com and python.    I'm 
having trouble using win32com to access Lotus Notes 
email.   Specifically, an attempt to get the Authors 
attribute of an IDocument crashes Python.

In essence I'm attempting to port the VB example code 
from http://www.tek-tips.com/viewthread.cfm?qid=67791 
to Python.   Running the code sample below crashes 
with standard Windows error messages (The instruction 
at [memaddress] referenced memory at "0x00000005".  
The memory could not be "read") in three different 
environments:

- From a Windows 2000 console interface.    Dialog title 
is "python.exe - Application Error"
- From IDLE.   Dialog title is "pythonw.exe - Application 
Error"
- From PythonWin.   Title is "PythonWin: 
PythonWin.exe - Application Error".  This is particularly 
egregious since it cascades into an MFC error that 
crashes the PythonWin editor!

** DEMO CODE **
import win32com.client

sess = win32com.client.Dispatch
("Lotus.NotesSession")       #instance of ISession
sess.Initialize()       #Will prompt for password first time 
through
mailDb = sess.GetDatabase("", sess.UserName)
mailDoc = mailDb.CreateDocument()      

b= mailDoc.IsValid  #This works
print "MailDoc.IsValid: ", b

url = mailDoc.HttpURL   #This works
print "mailDoc.HttpURL ", url

input = raw_input("Are you sure you want to crash 
PythonWin?")
if input == "yes":
    print "Prepare for crash..."
    auths = mailDoc.Authors 
    print "mailDoc.Authors", auths
else:
    print "Chicken!   Enjoy the safe landing"

** OUTPUT **
(Note: I made some minor hacks to 
win32com\client\__init__.py in _ApplyTypes_() and 
__getattr__() to enhance output.)
(Also: Notes prompts for the password in a console, 
which shows up separately in Idle.)

Class ID: {29131578-2EED-1069-BF5D-00DD011186B7}
Class ID: {29131567-2EED-1069-BF5D-00DD011186B7}
MailDoc.IsValid:  True
Class ID: {29131567-2EED-1069-BF5D-00DD011186B7}
mailDoc.HttpURL:  
Are you sure you want to crash PythonWin?yes
Prepare for crash...
Class ID: {29131567-2EED-1069-BF5D-00DD011186B7}
about to fail!
wFlags: 2

*************
I also tried loading Python with -vd flags, which produces 
extra output I'll attach in a file.

Any suggestions?   Any way to further troubleshoot w/o 
hacking around in Python C++ source (e.g., turning on 
better debugging)?

TIA,

Philip

----------------------------------------------------------------------

>Comment By: Mark Hammond (mhammond)
Date: 2005-09-23 08:51

Message:
Logged In: YES 
user_id=14198

This appears to be an access violation inside MFC itself. 
Without a debugger it will be very hard to track down.  It
may not crash in Python 2.3 as that uses a different MFC
version.  It should also not fail when using python.exe, as
MFC is out of the picture.

----------------------------------------------------------------------

Comment By: Philip Reed (philipreed)
Date: 2005-09-20 05:48

Message:
Logged In: YES 
user_id=392466

I forgot to note, this is Python 2.4 pywin32 extensions (build 
204) - Philip

----------------------------------------------------------------------

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