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Look for multiple openings of a program

keithcsl
keithcsl asked
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Last Modified: 2010-04-04
When I open a delphi application, how do I check if it is not already opened. If it is already opened, how do I divert to that application instead of opening a new one?

Keith
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Hi.  If you make the following changes to your project unit, it should work.  This code assumes your main form is TForm1 with caption Form1.  Make sure that the form's unit is NOT open in the Delphi designer...

(Add Windows to the project's uses clause.)

begin
  Application.Initialize;
  hWnd := FindWindow(PChar('TForm1'), PChar('Form1'));
  Application.CreateForm(TForm1, Form1);
  if (hWnd > 0) then begin
    SetForegroundWindow(hWnd);
    hWnd := GetWindow(hWnd, GW_OWNER);
    if (hWnd > 0) and (IsIconic(hWnd)) then
      ShowWindow(hWnd, SW_SHOWNORMAL);
  end else
    Application.Run;
end.

Regards,
JB

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P.S.  You'll need to declare a variable:

var
    hWnd: Integer;

Author

Commented:
I tried it and it works perfectly!!

Thanks!!!
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