[python-win32] Querying the VNC Service fails sometimes

[Roger Upole]

Mike Driscoll wrote:

Mike Driscoll wrote:

Hi,

In one of my login scripts for work, I run a query to see if the VNC
service is running using the win32serviceutil module. The code for
that I am using looks something like this:

<code>
import win32serviceutil
serviceState = win32serviceutil.QueryServiceStatus('VNC Server')[1]
</code>

This works in 99.99% of cases. However, I have on user that keeps
getting the following traceback:

Traceback (most recent call last):
 File "\\ourServer\pathName\PostLogon.py", line 207, in ?
   serviceState = win32serviceutil.QueryServiceStatus('VNC Server')[1]
 File
"\\ourServer\pathName\Python24\lib\site-packages\win32\lib\win32serviceutil.py",
line 479, in QueryServiceStatus
   hs = SmartOpenService(hscm, serviceName,
win32service.SERVICE_QUERY_STATUS)
 File
"\\ourServer\pathName\Python24\lib\site-packages\win32\lib\win32serviceutil.py",
line 81, in SmartOpenService
   name = _GetServiceShortName(name)
 File
"\\ourServer\pathName\Python24\lib\site-packages\win32\lib\win32serviceutil.py",
line 62, in _GetServiceShortName
   skey = win32api.RegOpenKey(hkey, svc, 0, access)
error: (2, 'RegOpenKeyEx', 'The system cannot find the file specified.')


I used regmon to try and figure out what part of the Registry my code
looks at and it appears to be looking for the "DisplayName" value in
HKLM\SYSTEM\CurrentControlSet\Services\winvnc

I cannot see a difference in this user's registry versus my own, which
does not have this issue. However, I can duplicate the error by
connecting to the user's PC's registry using the _winreg module and
querying the "DisplayName" value, like this:

QueryValue(key, 'DisplayName')

Which give me this traceback:

Traceback (most recent call last):
 File "<pyshell#14>", line 1, in <module>
   QueryValue(key, 'DisplayName')
WindowsError: [Error 2] The system cannot find the file specified

But if I use use _winreg's EnumValue, I get this:

EnumValue(key, 4)

('DisplayName', u'VNC Server', 1)

What the!? Does anyone have any suggestions? Maybe a better way to get
the information? I only need to know if the service is running or not,
and if not, to start it.

Thanks!

I forgot to mention that we use Windows XP, Python 2.4 and PyWin32
version 210.

Mike

You might want to try build 211.  It uses the API function
GetServiceKeyName instead of manually enumerating the
registry.

However, it sounds like you could have a corrupt registry key.
Try reinstalling the service and see if that helps.

        Roger

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