Re: How to avoid multiple instances of a program in NT and 95?

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#2932

From: Amol Deshpande
Date: Wed, 05 Feb 1997 00:00

44 lines
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In article <5da29d$bs$2@newsserver.rrzn.uni-hannover.de>, 
h.eichmann@mbox.iqo.uni-hannover.de says...
>
>raymondc@microsoft.com.--- (Raymond Chen) wrote:
>
>
>>This still won't work if a second instance is started before the
>>first gets a chance to create its window.
>
>>Create a named event and check if you get ERROR_ALREADY_EXISTS
>>from GetLastError.
>
>Hi!
>
>What happens if the program crashes before it can release the event?
>It is improbably also possible that a different program uses the same 
>name for an event.

If the program crashes (terminates), the event is released.

>
>What about this:
>
>Open your own EXE file for read access and do not allow other
>tasks to open the file. If this fails someone als has a lock on
>this file and another instance is still running.
>
>Yours
>
>
>Heiner Eichmann
>Inst. of Quantum Optics
>University of Hanover, Germany
>h.eichmann@mbox.iqo.uni-hannover.de
>

But then I could always copy the .exe to a different name and run another
instance. 

-amol
-- 
The opinions expressed in this message are my own personal views 
and do not reflect the official views of Microsoft Corporation.

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From: amold@microsoft.com (Amol Deshpande)
Subject: Re: How to avoid multiple instances of a program in NT and 95?
Date: 1997/02/05
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