Foros Club Delphi - Listar los servicios instalados en Windows XP

Hola. Pues resulta ser que pongo aqui este pequeño codigo para aquellas personas que lo necesiten. No es mas que mostrar los servicios que tiene Windows XP instalado...

Código Delphi [-]const
  //
  // Service Types
  //
  SERVICE_KERNEL_DRIVER = $00000001;
  SERVICE_FILE_SYSTEM_DRIVER = $00000002;
  SERVICE_ADAPTER = $00000004;
  SERVICE_RECOGNIZER_DRIVER = $00000008;

  SERVICE_DRIVER =
    (SERVICE_KERNEL_DRIVER or
    SERVICE_FILE_SYSTEM_DRIVER or
    SERVICE_RECOGNIZER_DRIVER);

  SERVICE_WIN32_OWN_PROCESS = $00000010;
  SERVICE_WIN32_SHARE_PROCESS = $00000020;
  SERVICE_WIN32 =
    (SERVICE_WIN32_OWN_PROCESS or
    SERVICE_WIN32_SHARE_PROCESS);

  SERVICE_INTERACTIVE_PROCESS = $00000100;

  SERVICE_TYPE_ALL =
    (SERVICE_WIN32 or
    SERVICE_ADAPTER or
    SERVICE_DRIVER or
    SERVICE_INTERACTIVE_PROCESS);

uses WinSvc;

//-------------------------------------
// Get a list of services
//
// return TRUE if successful
//
// sMachine:
//   machine name, ie: \\SERVER
//   empty = local machine
//
// dwServiceType
//   SERVICE_WIN32,
//   SERVICE_DRIVER or
//   SERVICE_TYPE_ALL
//
// dwServiceState
//   SERVICE_ACTIVE,
//   SERVICE_INACTIVE or
//   SERVICE_STATE_ALL
//
// slServicesList
//   TStrings variable to storage
//

function ServiceGetList(
  sMachine: string;
  dwServiceType,
  dwServiceState: DWord;
  slServicesList: TStrings)
  : boolean;
const
  //
  // assume that the total number of
  // services is less than 4096.
  // increase if necessary
  cnMaxServices = 4096;

type
  TSvcA = array[0..cnMaxServices]
    of TEnumServiceStatus;
  PSvcA = ^TSvcA;

var
  //
  // temp. use
  j: integer;

  //
  // service control
  // manager handle
  schm: SC_Handle;

  //
  // bytes needed for the
  // next buffer, if any
  nBytesNeeded,

  //
  // number of services
  nServices,

  //
  // pointer to the
  // next unread service entry
  nResumeHandle: DWord;

  //
  // service status array
  ssa: PSvcA;
begin
  Result := false;

  // connect to the service
  // control manager
  schm := OpenSCManager(
    PChar(sMachine),
    nil,
    SC_MANAGER_ALL_ACCESS);

  // if successful...
  if (schm > 0) then
  begin
    nResumeHandle := 0;

    New(ssa);

    EnumServicesStatus(
      schm,
      dwServiceType,
      dwServiceState,
      ssa^[0],
      SizeOf(ssa^),
      nBytesNeeded,
      nServices,
      nResumeHandle);

    //
    // assume that our initial array
    // was large enough to hold all
    // entries. add code to enumerate
    // if necessary.
    //

    for j := 0 to nServices - 1 do
    begin
      slServicesList.
        Add(StrPas(
        ssa^[j].lpDisplayName));
    end;

    Result := true;

    Dispose(ssa);

    // close service control
    // manager handle
    CloseServiceHandle(schm);
  end;
end;

Un ejemplo de uso de la funcion. Debemos insertar un ListBox:

Código Delphi [-]ServiceGetList('', SERVICE_WIN32, SERVICE_STATE_ALL, ListBox1.Items);