problem querying WMI in a background thread

[Fazan]

Indeed, calling pythoncom.CoInitialize() before instantiating WMI
seems to do the trick.  Thanks!

Tim Golden <tim.golden at viacom-outdoor.co.uk> wrote in message news:<mailman.5801.1099385489.5135.python-list at python.org>...
> [dr_burrito at yahoo.com]
> | I'm using Tim Golden's WMI implementation
> | (http://tgolden.sc.sabren.com/python/wmi.html) version 0.6 along with
> | pywin32 build 202.  I'm able to successfully query WMI in the main
> | thread but not in a separate thread.
> | 
> | Here's a little snippet of sample code that fails for me:
> 
> [... snip example ...]
> 
> Well, I'm going to be mildly unhelpful, and say that I
> don't strictly understand why your code doesn't work.
> The thing which usually bites when using WMI and threads
> is the CoInitialize trap, but it usually comes out as
> an explicit "Must call CoInitialize" exception rather
> than as a random COM error. At the end of the day, the
> plumbing in WMI is just COM/DCOM so most things comes
> down to issues of COM and threading.
> 
> But, to me more helpful, the example below does work,
> so maybe you can work backwards from it.
> 
> <code>
> import pythoncom
> import wmi
> import threading
> 
> class Info (threading.Thread):
>   def __init__ (self):
>     threading.Thread.__init__ (self)
> 
>   def run (self):
>     print 'In Another Thread...'
>     pythoncom.CoInitialize ()
>     c = wmi.WMI ()
>     while 1:
>       for process in c.Win32_Process ():
>         print process.ProcessId, process.Name
> 
> if __name__ == '__main__':
>   print 'In Main Thread'
>   c = wmi.WMI ()
>   for process in c.Win32_Process ():
>     print process.ProcessId, process.Name
>   Info ().start ()
> </code>
> 
> TJG
> 
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