Subj : Re: Prevent loading multiple instances of program
To   : borland.public.cpp.borlandcpp
From : "Regis St-Gelais" <regis.st-gelais@NOSPAM.laubrass.com>
Date : Tue Dec 16 2003 08:53 am

This works in win 9x , win2k and win XP
It create a mutex if this is the first instance. Replace the mutex name by
someting unic.

bool MyAppAlreadyRunning(void)
 {
 HANDLE hMutex = NULL;

 hMutex = CreateMutex(NULL,true,_T("MyAppRunningMutex"));
 if (GetLastError() == ERROR_ALREADY_EXISTS )
  {
  CloseHandle(hMutex);
  return(true);    // Already running
  }
 return(false);    // First instance
}


-- 
Regis St-Gelais, P. Eng. / ing.
Software Development / Développement informatique
www.laubrass.com
--
"C. Chris Rogers" <ccrogers@thegrid.net> a écrit dans le message de
news:3fde6a09$1@newsgroups.borland.com...
> How can I prevent loading multiple instances of a program in the Windows
> 2000 environment? The book, "C++ Builder How-T0", describes a method
> that uses a mutex, and it works with Windows 98, but not Windows 2000.
> Please help.
> Thanx
> CR
>

.