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Detect whether another program is currently running

Posted on 1998-09-30
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Last Modified: 2010-04-06
I have two Delphi 1.0 applications...Application "A" calls application "B", however, it is vital that application "A" does not call application "B" if application "B" is already running and in memory.   How can I detect from app "A" whether app "B" is currently running and in memory?   I would like to avoid having to use "placemarker" files on the hard disk, you know, app "B" writes a temp file "NOW_RUN.$" and app "A" checks to see if the "NOW_RUN.$" file exists...if it does, then it will not launch app "B"...for this logic could fail if app "B" fails to erase the temp "placemarker" file.  I am looking for a more foolproof method.
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Question by:Monroe406
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7 Comments
 
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Accepted Solution

by:
viktornet earned 70 total points
ID: 1341356
Get the caption of app B and then do the following before executeing app B

var
  H : HWND;
begin
  H := FindWindow(nil, 'TheCaptionOfAppB');
  if H = 0 then begin
    //Execute the program.... e.g ShellExecute()
  end;
end;

Regards,
Viktor Ivanov
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Author Comment

by:Monroe406
ID: 1341357
Thanks!
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Author Comment

by:Monroe406
ID: 1341358
Thanks!

One comment though...  It really isn't the .Caption that I should be looking for, is it?  Is it not the Application.Title string that I should be looking for?   The main .dpr file does not have a .Caption property.
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LVL 10

Expert Comment

by:viktornet
ID: 1341359
The caption of the main form....How many forms do you have in app B??? If there are more then one you can check for all of them or try the Application.Title but I haven't tested that so try it and tell me if it works that way....
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Author Comment

by:Monroe406
ID: 1341360
I have 3 forms in Application "B".   Your code works if I use the Application "A"'s Application.Title property....that's why I made the comment.
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Author Comment

by:Monroe406
ID: 1341361
Whoops!  Typo....my message should have read:

I have 3 forms in Application "B".   Your code works if I use the Application __"B"'s__ Application.Title property....that's why I made the comment.
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Expert Comment

by:viktornet
ID: 1341362
So it works alright now, right???

//Viktor
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