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  Application.Initialize;
  Application.Title := 'TCI Service';
  Application.CreateForm(TBAKService, BAKService);
  Application.CreateForm(TForm1,Form1);
  Application.Run;                    

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  Application.Initialize;
  Application.Title := 'TCI Service';
  Application.CreateForm(TBAKService, BAKService);
  BAKService.ServiceStart(BAKServce);
  BAKService.ServiceExecute(BAKService);
  // Application.Run wurde in den BAKService.Execute verschoben
  BAKService.ServiceDestroy(BAKService);                    

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, SvcMgr,   Dialogs, WinSvc;

type
  TBAKService = class(TService)
    procedure ServicePause(Sender: TService; var Paused: Boolean);
    procedure ServiceStart(Sender: TService; var Started: Boolean);
    procedure ServiceContinue(Sender: TService; var Continued: Boolean);
    procedure ServiceStop(Sender: TService; var Stopped: Boolean);
    procedure ServiceCreate(Sender: TObject);
    procedure ServiceDestroy(Sender: TObject);
    procedure ServiceExecute(Sender: TService);
  private
  public
    hWndProc  : THandle;
    hSCM      : THandle;
    hService  : THandle;
    function  GetServiceController: TServiceController; override;
    procedure WndProc(var Message: TMessage);
  end;

type
  TThreadTool = class (TThread)
   private
   public
    procedure InitialForm;
    procedure TerminateForm;
    procedure Execute; override;
  end;

var

   BAKService: TBAKService;
   ThreadTool: TThreadTool = NIL;

implementation

uses Frm_Main;

{$R *.DFM}


procedure TThreadTool.Execute;
 begin
  Synchronize(InitialForm);
  try
   repeat
    sleep(10);                              
   until Terminated;
  finally
   if assigned(Form1) then Synchronize(TerminateForm);
  end;
end;

procedure TThreadTool.InitialForm;
 begin
  Form1 := TForm1.Create(NIL);
  Form1.Show;
end;

procedure TThreadTool.TerminateForm;
 begin
  Form1.Free;
  Form1 := NIL;
end;

procedure TBAKService.WndProc(var Message: TMessage);
 begin
  if assigned(Form1) then postmessage(Form1.Handle, Message.Msg, Message.WParam, Message.LParam);
end;

procedure ServiceController(CtrlCode: DWord); stdcall;
begin
  BAKService.Controller(CtrlCode);
end;

function TBAKService.GetServiceController: TServiceController;
begin
  Result := ServiceController;   
end;

procedure TBAKService.ServicePause(Sender: TService; var Paused: Boolean);
 begin
  ThreadTool.Suspend;
  Paused := True;
end;

procedure TBAKService.ServiceStart(Sender: TService; var Started: Boolean);
 begin
  ThreadTool.Resume;
  Started := True;
end;

procedure TBAKService.ServiceContinue(Sender: TService;
  var Continued: Boolean);
 begin
  if ThreadTool.Suspended then ThreadTool.Resume;
  Continued := True;
end;

procedure TBAKService.ServiceStop(Sender: TService; var Stopped: Boolean);
 begin
  ThreadTool.Suspend;
  Stopped := True;
end;

procedure TBAKService.ServiceCreate(Sender: TObject);
 begin
  hWndProc := AllocateHWnd(WndProc);
  ThreadTool := TThreadTool.Create(TRUE);
end;

procedure TBAKService.ServiceDestroy(Sender: TObject);
 begin
  if assigned(ThreadTool) then
   begin
    ThreadTool.Terminate;
    ThreadTool.WaitFor;
    ThreadTool.Free;
  end;
  DeAllocateHWnd(hWndProc);
end;

procedure TBAKService.ServiceExecute(Sender: TService);
 begin
  Application.Run; // wenn nicht schon im Project-Code 
  repeat
   sleep(10);
  until Terminated;
end;

end.