object Form1: TForm1
  Left = 192
    Top = 107
    Width = 264
    Height = 121
    Caption = 'Сервис'
    Color = clBtnFace
    Font.Charset = DEFAULT_CHARSET
    Font.Color = clWindowText
    Font.Height = -11
    Font.Name = 'MS Sans Serif'
    Font.Style = []
    OldCreateOrder = False
    PixelsPerInch = 96
    TextHeight = 13
    object Label1: TLabel
    Left = 2
      Top = 8
      Width = 67
      Height = 13
      Caption = 'Имя сервиса'
  end
  object Button1: TButton
    Left = 4
      Top = 56
      Width = 95
      Height = 25
      Caption = 'Стоп сервис'
      TabOrder = 0
      OnClick = Button1Click
  end
  object Button2: TButton
    Left = 148
      Top = 56
      Width = 95
      Height = 25
      Caption = 'Старт сервис'
      TabOrder = 1
      OnClick = Button2Click
  end
  object Edit1: TEdit
    Left = 0
      Top = 24
      Width = 241
      Height = 21
      TabOrder = 2
      Text = 'Messenger'
  end
end

unit Unit1;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Winsvc;

type

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Edit1: TEdit;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure StopService(ServiceName: string);
    procedure Button2Click(Sender: TObject);
    procedure StartService(ServiceName: string);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var

  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
  StopService(Edit1.Text);
end;

procedure TForm1.StopService(ServiceName: string);
var

  schService,
    schSCManager: DWORD;
  p: PChar;
  ss: _SERVICE_STATUS;
begin

  p := nil;
  schSCManager := OpenSCManager(nil, nil, SC_MANAGER_ALL_ACCESS);
  if schSCManager = 0 then
    RaiseLastWin32Error;
  try
    schService := OpenService(schSCManager, PChar(ServiceName),
      SERVICE_ALL_ACCESS);
    if schService = 0 then
      RaiseLastWin32Error;
    try
      if not ControlService(schService, SERVICE_CONTROL_STOP, SS) then
        RaiseLastWin32Error;
    finally
      CloseServiceHandle(schService);
    end;
  finally
    CloseServiceHandle(schSCManager);
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  StartService(Edit1.Text);
end;

procedure TForm1.StartService(ServiceName: string);
var

  schService,
    schSCManager: Dword;
  p: PChar;
begin

  p := nil;
  schSCManager := OpenSCManager(nil, nil, SC_MANAGER_ALL_ACCESS);
  if schSCManager = 0 then
    RaiseLastWin32Error;
  try
    schService := OpenService(schSCManager, PChar(ServiceName),
      SERVICE_ALL_ACCESS);
    if schService = 0 then
      RaiseLastWin32Error;
    try
      if not Winsvc.startService(schService, 0, p) then
        RaiseLastWin32Error;
    finally
      CloseServiceHandle(schService);
    end;
  finally
    CloseServiceHandle(schSCManager);
  end;
end;

end.