Re: Multiple Instances

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#15034

From: Jonathan Arnold
Date: Tue, 22 Jul 2003 14:57

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> How can I prevent a program from opening if one instance of it is 
> already running?

As is usual for BCB, there are several of ways:

1) Get a component to do the work.  The ZieglerCollection has a component that will
check for you: http://www.zieglersoft.com

2) Use a mutex to check for a previous instance. See Harold Howe's definitive
description of this method at:

http://www.bcbdev.com/faqs/faq74.htm

Or Alan Mill's at:

http://www.thebits.first-web.net/zips/onceonly.zip

3) Use a Mailslot, as per Robert Dunn's work at
http://home.att.net/~robertdunn/Yacs.html.

BCB5 has an example in the Examples\Controls\SingleInst folder.

-- 
Jonathan Arnold         C/C++/CBuilder Keen Advice:
http://www.keen.com/categories/categorylist_expand.asp?sid=5156620
    Comprehensive C++Builder link site:
http://www.buddydog.org/C++Builder/c++builder.html

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