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procedure DebugMsg(const Msg: String);
begin
    OutputDebugString(PChar(Msg))
end;					

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program Project3;
{$IFDEF DEBUG}
  {$APPTYPE CONSOLE}
{$ENDIF}					

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unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm2 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    procedure DebugOut(const s: String);
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
    FHasConsole:Boolean;
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
var
  I: Integer;
begin
   for I := 1 to 100 do
      begin
        Caption := IntToStr(i);
        DebugOut('Schleife an Stelle '+ IntToStr(i))
      end;
end;

procedure TForm2.FormCreate(Sender: TObject);
begin
  FHasConsole := Windows.AllocConsole;
end;

procedure TForm2.FormDestroy(Sender: TObject);
begin
   if FHasConsole then FreeConsole;

end;

Procedure TForm2.DebugOut(Const s:String);
begin
  if FHasConsole then Writeln(s);
end;

end.