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unit uMain; 

interface 

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

type 
  TTestservice = class(TService) 
    procedure ServiceStart(Sender: TService; var Started: Boolean); 
    procedure ServiceCreate(Sender: TObject); 
    procedure ServiceExecute(Sender: TService); 
    procedure ServiceDestroy(Sender: TObject); 
  private 
    { Private-Deklarationen } 
    LogFile: TStringList; 
  public 
    function GetServiceController: TServiceController; override; 
    { Public-Deklarationen } 
  end; 

var 
  Testservice: TTestservice; 

implementation 

{$R *.DFM} 

const LogFileName = 'c:\test\Service_log.txt'; 

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

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

procedure TTestservice.ServiceCreate(Sender: TObject); 
begin 
  LogFile:=TStringList.Create; 
end; 

procedure TTestservice.ServiceDestroy(Sender: TObject); 
begin 
  LogFile.Free; 
end; 

procedure TTestservice.ServiceExecute(Sender: TService); 
begin 
  while not Terminated do 
  begin 
    ServiceThread.ProcessRequests(False); 
    Sleep(5000); 
    LogFile.Add(DateTimeToStr(Now)+' OnExecute'); 
    LogFile.SaveToFile(LogFileName); 
  end; 
end; 

procedure TTestservice.ServiceStart(Sender: TService; var Started: Boolean); 
begin 
  LogFile.Add(DateTimeToStr(Now)+' Service gestartet'); 
  LogFile.SaveToFile(LogFileName); 
end; 

end.                    

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 AssignFile(datei,'c:\test\Daten.txt');
  if FileExists('c:\test\Daten.txt') then Append(datei)
    else ReWrite(datei);