Re: Quesion on mutex

From:
Dimwit Flathead <d.flathead@quendor.org>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 12 Jul 2006 22:50:35 -0700
Message-ID:
<eo6dnbCDNNrQQyjZnZ2dnUVZ_rSdnZ2d@scnresearch.com>
sabarad_arun@hotmail.com wrote:

Hi All,

I have two applications,Application1 and Application2.I am invoking
Application2 from Application1 by using CreateProcess() function.

What i want to do is in the InitInstance of the Application1 i want to
see if the Application2 was already invoked from Application1.If yes
then i dont want to invoke it again.i.e I dont want multiple instances
of Application2 to be created.

So for this what i did was as follows...
In Application2's InitInstance i used a named mutex as follows.
BOOL Application2::InitInstance()
{
               hGlobalMutex = CreateMutex(NULL,FALSE,"NamedMutex");
    DWORD dwError = GetLastError();
    if ( hGlobalMutex != NULL )
    {
        if ( dwError == ERROR_ALREADY_EXISTS )
        {
            return FALSE;
        }
    }
}

Now how can i get this information in the Application1's InitInstance
that one instance of Application2 is already running?

Can anyone share their ideas on this...

Regards,
Arun


I have done something similar using the global atom table. Have a look
at GlobalAddAtom(), GlobalFindAtom() and GlobalDeleteAtom().

-DF

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