RE: Thread termination

[Stefan Schukat]

Hello

 

you are using the module variable ie inside the Generic Function, but you have to use  "d" since this is the Python object

which is allowed to access the COM object in the separate thread.

 

    Stefan

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From: Tejovathi P [mailto:[EMAIL PROTECTED]
Sent: Monday, October 16, 2006 9:47 AM
To: Stefan Schukat
Subject: Re: Thread termination

HI all,

I have a problem in accesing COM objects in threads. To be precise, lets assume that I have a class GenericFunctions which is defined as follows:

import win32com.client, pythoncom, thread
ie=win32com.client.Dispatch('internetexplorer.application')
ie.Visible=1

class GenericFunctions:
       
       def __init__(self):
             print "In Constructor of Generic Functions"
       
       def MyNavigate(self,dest):
             ie.Navigate(dest)

Now there  is another file Main.py which is defined as follows:

import win32com.client, pythoncom, thread
from GenericFunctions import *
obj = GenericFunctions()

class Mainclass:
       def __init__(self);
            print "In Constructor of Main class"

       def threadFunction(self,dest):
            pythoncom.CoInitialize()
            d=pythoncom.CoGetInterfaceAndReleaseStream(s, pythoncom.IID_IDispatch)
            my_ie=win32com.client.Dispatch(d)
            obj.func(dest)          # this is gving an error.
            pythoncom.CoUninitialize()

if __name__ == "__main__":
        s=pythoncom.CoMarshalInterThreadInterfaceInStream(pythoncom.IID_IDispatch,ie)
         thread.start_new_thread(self.nav, (s,'www.google.com ')

Basically, I want to access object of GenericFunctions class inside threadFunction(). However I was able to execute my_ie.Navigate("google.com"). But that was not I wanted. I am not knowing where the error is....
Please let me know the solution ASAP...

Teja.P

 

On 10/13/06, Stefan Schukat <[EMAIL PROTECTED]> wrote:

Reading from your last posts you are using COM objects. Therefore you
should not "kill" the thread since this
would lead to reference leaks. So there are only two ways left:

1. Program a specific interpreter and not use python.exe which
implements an access to PyThreadState_SetAsyncExc
2. Check in the separate thread at specific times a variable which is
set in the main thread.

Both need the try finally construct in the threadfunction to release COM
objects in the right way.
I.e., (taking the source from Roger):


def ThreadFunction(istream, dest):
     pythoncom.CoInitialize() // Initialize COM Runtime for this thread
       try:
               d=pythoncom.CoGetInterfaceAndReleaseStream(istream,
pythoncom.IID_IDispatch)
               my_ie=win32com.client.Dispatch (d)
               my_ie.Navigate(dest)
       finally:
               my_ie = None  // Release COM object
             pythoncom.CoUninitialize() // Release COM Runtime for this
thread


       Stefan

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