Detecting second instance of a program in NT!

[Roger Burnham]

On Wed, 12 May 1999 12:04:21 -0500, "SunitJoshi" <SunitJoshi at email.msn.com> wrote:

>    I was wondering if it's possible to note a more than one instance of an
>application being opened, using python in NT env.  Also is it possible to
>time the start & end of an instance.
>

Sunit,

I use

On startup:

            import win32event, win32ui, winerror
            self.singleInstanceMutex = win32event.CreateMutex(None, 1, self.name)
            lastErr = win32api.GetLastError()
            if lastErr == winerror.ERROR_ALREADY_EXISTS:
                msg = '''
    You are already running a copy of:
    %s
    Only one at a time allowed!
''' % self.name
                win32ui.MessageBox(msg, 'Can only run one instance')
                raise SystemExit


and on exit:

                win32event.ReleaseMutex(self.singleInstanceMutex)


Cheers,

Roger Burnham   
Cambridge Research & Instrumentation   
rburnham at cri-inc.com   
http://www.cri-inc.com/   
http://starship.python.net/crew/roger/   
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