Binaryworld - ServiceCommand - Start, stop, pause, and continue a Windows NT service ... [ VB -> Windows ]

Private Type SERVICE_STATUS
  dwServiceType As Long
  dwCurrentState As Long
  dwControlsAccepted As Long
  dwWin32ExitCode As Long
  dwServiceSpecificExitCode As Long
  dwCheckPoint As Long
  dwWaitHint As Long
End Type

Private Declare Function OpenSCManager Lib "advapi32.dll" Alias _
  "OpenSCManagerA" (ByVal lpMachineName As String, _
  ByVal lpDatabaseName As String, ByVal dwDesiredAccess As Long) As Long
Private Declare Function CloseServiceHandle Lib "advapi32.dll" (ByVal hSCObject _
  As Long) As Long
Private Declare Function OpenService Lib "advapi32.dll" Alias "OpenServiceA" _
  (ByVal hSCManager As Long, ByVal lpServiceName As String, _
  ByVal dwDesiredAccess As Long) As Long
Private Declare Function StartService Lib "advapi32.dll" Alias "StartServiceA" _
  (ByVal hService As Long, ByVal dwNumServiceArgs As Long, _
  ByVal lpServiceArgVectors As Long) As Long
Private Declare Function ControlService Lib "advapi32.dll" (ByVal hService As _
  Long, ByVal dwControl As Long, lpServiceStatus As SERVICE_STATUS) As Long

Const GENERIC_EXECUTE = &H20000000
Const SERVICE_CONTROL_STOP = 1
Const SERVICE_CONTROL_PAUSE = 2
Const SERVICE_CONTROL_CONTINUE = 3

' start/stop/pause/continue a service
' SERVICENAME is the internal name of the service
' COMMAND can be 0=Start, 1=Stop, 2=Pause, 3=Continue
'
' returns True if successful, False otherwise
' if any error, call Err.LastDLLError for more information

Function ServiceCommand(ByVal ServiceName As String, ByVal command As Long) As _
  Boolean
  Dim hSCM As Long
  Dim hService As Long
  Dim res As Long
  Dim lpServiceStatus As SERVICE_STATUS

  ' first, check the command
  If command < 0 Or command > 3 Then Err.Raise 5

  ' open the connection to Service Control Manager, exit if error
  hSCM = OpenSCManager(vbNullString, vbNullString, GENERIC_EXECUTE)
  If hSCM = 0 Then Exit Function

  ' open the given service, exit if error
  hService = OpenService(hSCM, ServiceName, GENERIC_EXECUTE)
  If hService = 0 Then GoTo CleanUp

  ' start the service
  Select Case command
    Case 0
      ' to start a service you must use StartService
      res = StartService(hService, 0, 0)
    Case SERVICE_CONTROL_STOP, SERVICE_CONTROL_PAUSE, _
      SERVICE_CONTROL_CONTINUE
      ' these commands use ControlService API
      ' (pass a NULL pointer because no result is expected)
      res = ControlService(hService, command, lpServiceStatus)
  End Select
  If res = 0 Then GoTo CleanUp

  ' return success
  ServiceCommand = True

CleanUp:
  If hService Then CloseServiceHandle hService
  ' close the SCM
  CloseServiceHandle hSCM

End Function