[EMAIL PROTECTED] wrote:
> I'm developing a web application using mod_python and the apache web
> server. That application has to handle xml files and for that I'm
using
> win32com with with MSXML.
>
> My problem is, that apache spawns a new process / thread (not sure
> wether ist a process or thread. I think it's a thread)
On Windows, almost certainly a thread. Apache on Windows uses the
"winnt" MPM, which is multithreaded, not multiprocess.
> per http
> request. So when multiple users generated requests "at the same time"
> (new request before the first one is returned) I have multiple threads
> running. And that's where my win32com code is crashing...
>
> Currently, for every request my code does the following (as an
> example):
>
> return win32com.client.Dispatch("Msxml2.DOMDocument.6.0")
>
> To get an empty MSXSML DOM object.
>
> For multiple requests at the same time I get the following error:
>
> File "C:\Program Files\Apache Software
>
Foundation\Apache2.2\TCRExceptionManagerData\database_library\database.
> py", line 24, in __init__
> self.__configFileSchema = self.__XSDSchemaCache()
>
> File "C:\Program Files\Apache Software
>
Foundation\Apache2.2\TCRExceptionManagerData\database_library\database.
> py", line 1774, in __XSDSchemaCache
> return win32com.client.Dispatch("MSXML2.XMLSchemaCache.6.0")
>
> File "C:\Program Files\Python25\lib\site-
> packages\win32com\client\__init__.py", line 95, in Dispatch
> dispatch, userName =
> dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
>
> File "C:\Program Files\Python25\lib\site-
> packages\win32com\client\dynamic.py", line 98, in
> _GetGoodDispatchAndUserName
> return (_GetGoodDispatch(IDispatch, clsctx), userName)
>
> File "C:\Program Files\Python25\lib\site-
> packages\win32com\client\dynamic.py", line 78, in _GetGoodDispatch
> IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
> pythoncom.IID_IDispatch)
>
> com_error: (-2147221008, 'CoInitialize has not been called.', None,
> None)
>
> I've read already a bit in this mailing list and someone mentioned
that
> one need to call pythoncom.CoInitialize() and
> pythoncom.CoUninitialize(). But I don't know where exactly i should
> call those functions and wether that'll solve my problem... Also, when
> I do a 'import win32com.pythoncom' I get an error that the module
> 'pythoncom' does not exist!
>
> I would be really happy if someone could help me and tell me how to
> make my win32com work for multiple threads!
As Alex mentioned, you need to call CoInitialize for each thread.
Unfortunately, since Apache is creating the threads for you, you don't
have a hook for events to run on thread startup. Instead, you have to
watch threads as they go by and call CoInitialize ASAP. Best to do so
with a try/finally in case something goes wrong:
def handler(req):
CoInitialize()
try:
process(req)
return apache.OK
finally:
CoUninitialize()
If for various reasons that can't be made to work (some components just
aren't thread safe), another option would be to run all the COM calls in
a single thread and use a Queue; request threads would call q.put(xml,
reqid) and block, the COM thread would call q.get(), do the work, and
shove the result into results[reqid].
Robert Brewer
[EMAIL PROTECTED]
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