On 4/8/06, Alan Gauld <[EMAIL PROTECTED]> wrote: > > Desktop to the executable). The problem is, only *one* person at a time > > should run the program.
[snip] > > The usual way of doing this is simply to create an empty file > when the program starts and delete it when the program closes > In python: > Couldn't this approach cause problems if the Python program crashes, leaving behind the empty file? However, there is a Cookbook solution that does, I believe, that what the original poster asked: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/67663 It is actually so short that I can even reproduce it below. ========= 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: # take appropriate action if this is the second # instance of this script; for example, print 'Oh! dear, I exist already.' exit ( 1 ) ============ A detailed explanation (of a slightly modified version) can be found in the second edition of the Python Cookbook [Recipe 9.9]. André _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
