Re: Single Application Instance Example
- From: Paul McNett <p@xxxxxxxxxxxx>
- Date: Tue, 14 Jun 2005 06:58:27 -0700
Chris Lambacher wrote:
Does anyone know of an example of how to make a Python program only run a single instance. I am specifically looking for examples for win32.
The Python Cookbook, Second Edition, page 380, recipe 9.9: Determining Whether Another Instance of a Script is Already Running in Windows, suggests using a mutex kernel object to be safe from race conditions:
from win32event import CreateMutex from win32api import GetLastError from winerror import ERROR_ALREADY_EXISTS from sys import exit handle = CreateMutex(None, 1, 'A unique mutex name') if GetLastError() == ERROR_ALREADY_EXISTS: print "I exist already" exit(1) else: print "I don't exist already"
I think I should be able to do this with win32all but the method is not obvious. Preferably I would like to be able to get a handle to the already running instance so that I can push it to the foreground as well.
There are ways using win32 to get the handle to the existing process, but I'm too rusty with win32 to offer that part of the solution.
-- Paul McNett http://paulmcnett.com
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