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Multiple instances of a program

Posted on 1997-03-15
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Last Modified: 2010-04-04
How do i check if theres already a copy of my program running on the system ??
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Question by:Daydream
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morwoodk earned 100 total points
ID: 1334766
You need to use the caption of your application to check for other instances of the same.  For this reason it is a good idea to come up with a fairly unique application caption.

To check for other instances of your application use the following:

anAppHandle := FindWindow( nil, 'Your application caption');

anAppHandle is of type HWND and will be nil if there are no other instances loaded.
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