MANAGE, CONTROL NT-SERVICES

unit ServiceManager;

interface

uses
  SysUtils, Windows, WinSvc;

type

  TServiceManager = class
  private
    { Private declarations }
    ServiceControlManager: SC_Handle;
    ServiceHandle: SC_Handle;
  protected
    function DoStartService(NumberOfArgument: DWORD; ServiceArgVectors: PChar): Boolean;
  public
    { Public declarations }
    function Connect(MachineName: PChar = nil; DatabaseName: PChar = nil;
      Access: DWORD = SC_MANAGER_ALL_ACCESS): Boolean;  // Access may be SC_MANAGER_ALL_ACCESS
    function OpenServiceConnection(ServiceName: PChar): Boolean;
    function StartService: Boolean; overload; // Simple start
    function StartService(NumberOfArgument: DWORD; ServiceArgVectors: PChar): Boolean;
      overload; // More complex start
    function StopService: Boolean;
    procedure PauseService;
    procedure ContinueService;
    procedure ShutdownService;
    procedure DisableService;
    function GetStatus: DWORD;
    function ServiceRunning: Boolean;
    function ServiceStopped: Boolean;
  end;

implementation

{ TServiceManager }

function TServiceManager.Connect(MachineName, DatabaseName: PChar;
  Access: DWORD): Boolean;
begin
  Result := False;
  { open a connection to the windows service manager }
  ServiceControlManager := OpenSCManager(MachineName, DatabaseName, Access);
  Result := (ServiceControlManager <> 0);
end;


function TServiceManager.OpenServiceConnection(ServiceName: PChar): Boolean;
begin
  Result := False;
  { open a connetcion to a specific service }
  ServiceHandle := OpenService(ServiceControlManager, ServiceName, SERVICE_ALL_ACCESS);
  Result := (ServiceHandle <> 0);
end;

procedure TServiceManager.PauseService;
var
  ServiceStatus: TServiceStatus;
begin
  { Pause the service: attention not supported by all services }
  ControlService(ServiceHandle, SERVICE_CONTROL_PAUSE, ServiceStatus);
end;

function TServiceManager.StopService: Boolean;
var
  ServiceStatus: TServiceStatus;
begin
  { Stop the service }
  Result := ControlService(ServiceHandle, SERVICE_CONTROL_STOP, ServiceStatus);
end;

procedure TServiceManager.ContinueService;
var
  ServiceStatus: TServiceStatus;
begin
  { Continue the service after a pause: attention not supported by all services }
  ControlService(ServiceHandle, SERVICE_CONTROL_CONTINUE, ServiceStatus);
end;

procedure TServiceManager.ShutdownService;
var
  ServiceStatus: TServiceStatus;
begin
  { Shut service down: attention not supported by all services }
  ControlService(ServiceHandle, SERVICE_CONTROL_SHUTDOWN, ServiceStatus);
end;

function TServiceManager.StartService: Boolean;
begin
  Result := DoStartService(0, '');
end;

function TServiceManager.StartService(NumberOfArgument: DWORD;
  ServiceArgVectors: PChar): Boolean;
begin
  Result := DoStartService(NumberOfArgument, ServiceArgVectors);
end;

function TServiceManager.GetStatus: DWORD;
var
  ServiceStatus: TServiceStatus;
begin
{ Returns the status of the service. Maybe you want to check this
  more than once, so just call this function again.
  Results may be: SERVICE_STOPPED
                  SERVICE_START_PENDING
                  SERVICE_STOP_PENDING
                  SERVICE_RUNNING
                  SERVICE_CONTINUE_PENDING
                  SERVICE_PAUSE_PENDING
                  SERVICE_PAUSED   }
  Result := 0;
  QueryServiceStatus(ServiceHandle, ServiceStatus);
  Result := ServiceStatus.dwCurrentState;
end;

procedure TServiceManager.DisableService;
begin
  { Implementation is following... }
end;

function TServiceManager.ServiceRunning: Boolean;
begin
  Result := (GetStatus = SERVICE_RUNNING);
end;

function TServiceManager.ServiceStopped: Boolean;
begin
  Result := (GetStatus = SERVICE_STOPPED);
end;

function TServiceManager.DoStartService(NumberOfArgument: DWORD;
  ServiceArgVectors: PChar): Boolean;
var
  err: integer;
begin
  Result := WinSvc.StartService(ServiceHandle, NumberOfArgument, ServiceArgVectors);
end;

end.

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