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Detect when an application...

Posted on 1998-03-28
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Last Modified: 2010-04-06

   How can i detect when an application starts and
   how when finish???

                 !!!Thanks for your time!!!

    e-mail: scortega@javercol.javeriana.edu.co
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Question by:kort77
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Accepted Solution

by:
paulo_psa earned 30 total points
ID: 1361000
Hi kort77,

Use HPrevInst to analize the handle of previous instance. If "0"  then the application run just once.

Note: You need add the units(Dialogs and WinProcs).

program Project1;

uses
  Forms,
  Dialogs,
  WinProcs,
  Unit1 in 'UNIT1.PAS' {Form1};

{$R *.RES}

begin
  if HPrevInst = 0 then
  begin
    Application.CreateForm(TForm1, Form1);
    Application.Run;
  end else
  begin
    ShowMessage('Application is already running');
    SetFocus(FindWindow('TForm1', nil));
  end;

end.

Regards
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Expert Comment

by:mmmbeer
ID: 1361001
Hiya kort77.  If you're looking to track the start and stop of programs other than yours, a good way to do THAT is to SetWindowsHookEX with the WH_SHELL parameter.  Then, you'll get a callback for every top-level window created.  I'd assume from there that you should be able to determine when apps start and stop.

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