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Dupelicate Instantces

Posted on 2000-04-05
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Last Modified: 2010-04-04
How do I check my program for duplicate instantaces??? Thanks!
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Question by:nafa2221
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Accepted Solution

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Epsylon earned 50 total points
ID: 2688152
On this page you can see how to do that:

http://www.gnomehome.demon.nl/uddf/pages/api.htm#api0
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Author Comment

by:nafa2221
ID: 2688676
that was somewhat confusing, can u post an example and where I would post the code, also can u tell me howto get to the area I am supposed to post my code? Thanks!!!
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Expert Comment

by:kretzschmar
ID: 2688770
hi nafa2221,

a simple method
(modification in the dpr-file)

program itTimer;

uses
  windows,
  Forms,
  Dialogs,
  itGlobal in 'itGlobal.pas',
  ufrmTIMER in 'ufrmTIMER.pas' {frmTIMER},
  doitAPI in 'doitAPI.pas',
  ufrmTIMERUpdate in 'ufrmTIMERUpdate.pas' {frmTimerUpdate},
  ufrmTIMERShow in 'ufrmTIMERShow.pas' {frmTimerShow},
  ufrmTimerSub in 'ufrmTimerSub.pas' {frmTimerSub},
  ufrmErrorReport in 'ufrmErrorReport.pas' {frmErrorReport},
  ufrmprobtimer in 'ufrmprobtimer.pas' {frmProblemeTimer};

{$R *.RES}

var StartUpH : THandle;

begin
  StartUpH := FindWindow(PChar('TfrmTIMER'),PChar('inTIME · Timer'));
  if (StartUpH <> 0) and (ParamStr(1) <> 'Test') then  //no testenviroment
  begin
//    ShowWindow(StartUpH,SW_SHOW);
    MessageDlg('itTimer ist bereits gestartet!',mtInformation,[mbOK],-1);
  end
  else
  begin
    Application.Initialize;
    Application.Title := 'inTIME · Timer';
    Application.CreateForm(TfrmTIMER, frmTIMER);
  Application.CreateForm(TfrmTimerUpdate, frmTimerUpdate);
  Application.Run;
  end;
end.

meikl
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Expert Comment

by:fulvio_brasil
ID: 2688776
Try this (put the code in .DPR file)

var Handle1: HWND;

begin
  Application.Initialize;
  Handle1 := FindWindow('TfrmMain','Caption');
  if (Handle1 = 0) then begin
    Application.CreateForm(TfrmMain, frmMain);
    ...
    Application.Run;
  end
  else
    ShowMessage('App already running!');
end.

Obs: 'TfrmMain' = Class of Main Form
     'Caption' = Caption on Main Form

cheers,

Fulvio.
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Expert Comment

by:Epsylon
ID: 2688788
Fulvio, would you mind to withdraw your answer since other solutions have been given before you...?
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Expert Comment

by:fulvio_brasil
ID: 2690289
No problem Epsylon!

What happend was when I posted it I didn't see the other solution (just 3 min. before)

See you,

F.
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Expert Comment

by:Epsylon
ID: 2690340
Yup, I see   :o)
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LVL 1

Expert Comment

by:fulvio_brasil
ID: 2692099
Hi Epsylon, please, could you answer me why a lot of people offers the answer like a comment, what's the advantage?
And about the point? How they won the points?

I'm new in the site and never understood it :o)

Thanks in advance,

Fulvio.
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LVL 13

Expert Comment

by:Epsylon
ID: 2697569
Fulvio, when you're sure that the answer is correct AND your're the first one then you could submit it as answer. But when someone else has already given a (partial) solution, submit it as comment. This is an unwritten(?) rule here at EE...
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LVL 1

Expert Comment

by:fulvio_brasil
ID: 2698956
Thanks Epsylon! :o)
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