Re: Stopping multiple instances of an application

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#12016

From: Michel Leunen
Date: Tue, 06 Jan 2004 17:05

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Andrew wrote:

> I am trying to stop more than one instance of my app running at any one
> time, normally I use a mutex and this works fine, most of the applications
> we have developed have used Win 9x but now we have moved to win 2k and the
> mutex doesn't seem to work any more, I have also tried semaphores and the
> API function FindWindow, please see the following
> 
> Using a mutex:

>         mutex = OpenMutex(NULL,false,mutexname.c_str());

mutex = OpenMutex(MUTEX_ALL_ACCESS,false,mutexname.c_str());

If it fails OpenMutex yields NULL indicating either that a non-existing 
mutex or an error when calling the function. I don't think you can use 
NULL for the dwDesiredAccess parameter.
It works at least for me with XP.

Michel
-- 
----------------------------------------
Michel Leunen
mailto:michel@leunen.com
C++Builder, C++BuilderX, BCC5.5.1 Web site:
http://www.leunen.com/
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