COM and Threads

[Teja]

Roger Upole wrote:
> "Teja" <tejovathi.p at gmail.com> wrote:
> >
> > Roger Upole wrote:
> >
> >> "Teja" <tejovathi.p at gmail.com> wrote:
> >> >
> >> > Roger Upole wrote:
> >> >
> >> >> "Teja" <tejovathi.p at gmail.com> wrote:
> >> >> >I have an application which uses COM 's Dispatch to create a COM based
> >> >> > object. Now I need to upgrade the application to a threaded one. But
> >> >> > its giving an error that COM and threads wont go together. Specifically
> >> >> > its an attribute error at the point where COM object is invoked. Any
> >> >> > pointers please??????
> >> >> >
> >> >>
> >> >> An actual traceback would help.
> >> >> At a guess, when using COM in a thread
> >> >> you need to call pythoncom.CoInitialize and
> >> >> CoUninitialize yourself.
> >> >>
> >> >>      Roger
> >> >
> >> > Actually Roger, this is the scenario....
> >> >
> >> > I create a COM object at the beginnning of the main thread. In the sub
> >> > thread, I need to access the same instance of the COM object. If it
> >> > were a normal object ie. not a COM obj, i was able to do it. But if it
> >> > were a COM object, its giving an attribute error? Should I pass a COM
> >> > object to the thread. If so How? Please let me know ASAP... Thnks
> >> >
> >>
> >> To pass COM objects between threads, usually they'll need to be marshaled
> >> using pythoncom.CoMarshalInterThreadInterfaceInStream, and unmarshaled
> >> with pythoncom.CoGetInterfaceAndReleaseStream.
> >>
> >>          Roger
> >
> > I really appreciate your quick reply....Can u please let me know how to
> > do marshalling and unmarshalling or any good refrences to do it.
> > Because i tried to do it. I got some errors ans so I left it...
> >
> > Thnks again...
> >
>
> Here's a simple example using Internet Explorer.
>
> import win32com.client, pythoncom, thread
> ie=win32com.client.Dispatch('internetexplorer.application')
> ie.Visible=1
>
> def nav(istream, dest):
>     pythoncom.CoInitialize()
>     d=pythoncom.CoGetInterfaceAndReleaseStream(istream, pythoncom.IID_IDispatch)
>     my_ie=win32com.client.Dispatch(d)
>     my_ie.Navigate(dest)
>     pythoncom.CoUninitialize()
>
> s=pythoncom.CoMarshalInterThreadInterfaceInStream(pythoncom.IID_IDispatch,ie)
> thread.start_new_thread(nav, (s, 'www.google.com'))
>
>       Roger

Thnks a lot Roger, Its working gr8..Now, once the thread is started
with start_new_thread, is there any way to terminate it upon user's
request. I have explored and found out that there is no thread.kill().
So wht to do now?

Teja