Imports System.ServiceProcess
Public Class MyService
Protected Overrides Sub OnStart(ByVal args() As String)
' Add code here to start your service. This method should set things
' in motion so your service can do its work.
End Sub
Protected Overrides Sub OnStop()
' Add code here to perform any tear-down necessary to stop your service.
End Sub
End Class
Dim service As New ServiceController("MyServiceName")
If (service.Status.Equals(ServiceControllerStatus.Stopped)) OrElse (service.Status.Equals(ServiceControllerStatus.StopPending)) Then
service.Start()
Else
service.Stop()
End If
Start, Stop and Pause NT Services
The following routines can be used to control NT Services on a local or remote machine. A demonstration routine is at the bottom of the post:
Option Explicit
Public Enum eServiceState
essStopService
essStartService
essPauseService
End Enum
Private Declare Function CloseServiceHandle Lib "advapi32.dll" (ByVal hSCObject As Long) As Long
Private Declare Function ControlService Lib "advapi32.dll" (ByVal lHwndService As Long, ByVal dwControl As Long, lpServiceStatus As SERVICE_STATUS) As Long
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 OpenService Lib "advapi32.dll" Alias "OpenServiceA" (ByVal hSCManager As Long, ByVal lpServiceName As String, ByVal dwDesiredAccess As Long) As Long
Private Declare Function QueryServiceStatus Lib "advapi32.dll" (ByVal lHwndService As Long, lpServiceStatus As SERVICE_STATUS) As Long
Private Declare Function StartService Lib "advapi32.dll" Alias "StartServiceA" (ByVal lHwndService As Long, ByVal dwNumServiceArgs As Long, ByVal lpServiceArgVectors As Long) As Long
Private Const SERVICES_ACTIVE_DATABASE = "ServicesActive"
Private Const SERVICE_CONTROL_STOP = &H1
Private Const SERVICE_CONTROL_PAUSE = &H2
Private Const SERVICE_STOPPED = &H1
Private Const SERVICE_START_PENDING = &H2
Private Const SERVICE_STOP_PENDING = &H3
Private Const SERVICE_RUNNING = &H4
Private Const SERVICE_CONTINUE_PENDING = &H5
Private Const SERVICE_PAUSE_PENDING = &H6
Private Const SERVICE_PAUSED = &H7
Private Const STANDARD_RIGHTS_REQUIRED = &HF0000
Private Const SC_MANAGER_CONNECT = &H1
Private Const SC_MANAGER_CREATE_SERVICE = &H2
Private Const SC_MANAGER_ENUMERATE_SERVICE = &H4
Private Const SC_MANAGER_LOCK = &H8
Private Const SC_MANAGER_QUERY_LOCK_STATUS = &H10
Private Const SC_MANAGER_MODIFY_BOOT_CONFIG = &H20
Private Const SC_MANAGER_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED Or SC_MANAGER_CONNECT Or SC_MANAGER_CREATE_SERVICE Or SC_MANAGER_ENUMERATE_SERVICE Or SC_MANAGER_LOCK Or SC_MANAGER_QUERY_LOCK_STATUS Or SC_MANAGER_MODIFY_BOOT_CONFIG)
Private Const SERVICE_QUERY_CONFIG = &H1
Private Const SERVICE_CHANGE_CONFIG = &H2
Private Const SERVICE_QUERY_STATUS = &H4
Private Const SERVICE_ENUMERATE_DEPENDENTS = &H8
Private Const SERVICE_START = &H10
Private Const SERVICE_STOP = &H20
Private Const SERVICE_PAUSE_CONTINUE = &H40
Private Const SERVICE_INTERROGATE = &H80
Private Const SERVICE_USER_DEFINED_CONTROL = &H100
Private Const SERVICE_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED Or SERVICE_QUERY_CONFIG Or SERVICE_CHANGE_CONFIG Or SERVICE_QUERY_STATUS Or SERVICE_ENUMERATE_DEPENDENTS Or SERVICE_START Or SERVICE_STOP Or SERVICE_PAUSE_CONTINUE Or SERVICE_INTERROGATE Or SERVICE_USER_DEFINED_CONTROL)
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
'Purpose : Returns the status of a NT Service
'Inputs : sServiceName The name of the service to test
' [sComputerName] The name of the machine to test the service status on.
' If unspecified uses the local machine
'Outputs : Returns a English description of the service status
Public Function ServiceStatus(sServiceName As String, Optional sComputerName As String) As String
Dim tServiceStat As SERVICE_STATUS
Dim lHwndSManager As Long
Dim lHwndService As Long
Dim hServiceStatus As Long
'Check the input data
If InStr(1, sServiceName, " ") Then
Debug.Print "Service names cannot contain spaces. Use the 'Service Name' of the service, not the 'Display Name'"
Exit Function
End If
ServiceStatus = ""
'Open the service manager
lHwndSManager = OpenSCManager(sComputerName, SERVICES_ACTIVE_DATABASE, SC_MANAGER_ALL_ACCESS)
If lHwndSManager <> 0 Then
'Open the service
lHwndService = OpenService(lHwndSManager, sServiceName, SERVICE_ALL_ACCESS)
If lHwndService <> 0 Then
'Query the service
hServiceStatus = QueryServiceStatus(lHwndService, tServiceStat)
If hServiceStatus <> 0 Then
Select Case tServiceStat.dwCurrentState
Case SERVICE_STOPPED
ServiceStatus = "Stopped"
Case SERVICE_START_PENDING
ServiceStatus = "Start Pending"
Case SERVICE_STOP_PENDING
ServiceStatus = "Stop Pending"
Case SERVICE_RUNNING
ServiceStatus = "Running"
Case SERVICE_CONTINUE_PENDING
ServiceStatus = "Coninue Pending"
Case SERVICE_PAUSE_PENDING
ServiceStatus = "Pause Pending"
Case SERVICE_PAUSED
ServiceStatus = "Paused"
End Select
End If
'Close the service
CloseServiceHandle lHwndService
End If
'Close the service mananger
CloseServiceHandle lHwndSManager
End If
End Function
'Purpose : Changes the state of an NT Service
'Inputs : sServiceName The name of the service to test
' [sComputerName] The name of the machine to test the service status on.
' If unspecified uses the local machine
'Outputs : N/A
Public Function ServiceStateChange(sServiceName As String, eState As eServiceState, Optional sComputerName As String) As Boolean
Dim tServiceStatus As SERVICE_STATUS
Dim lHwndSManager As Long
Dim lHwndService As Long
Dim lRes As Long
'Check the input data
If InStr(1, sServiceName, " ") Then
Debug.Print "Service names cannot contain spaces. Use the 'Service Name' of the service, not the 'Display Name'"
ServiceStateChange = False
Exit Function
End If
'Open the service manager
lHwndSManager = OpenSCManager(sComputerName, SERVICES_ACTIVE_DATABASE, SC_MANAGER_ALL_ACCESS)
If lHwndSManager <> 0 Then
'Open the service
lHwndService = OpenService(lHwndSManager, sServiceName, SERVICE_ALL_ACCESS)
If lHwndService <> 0 Then
Select Case eState
Case essPauseService
'Pause the service
lRes = ControlService(lHwndService, SERVICE_CONTROL_PAUSE, tServiceStatus)
Case essStartService
'Start the service
lRes = StartService(lHwndService, 0, 0)
Case essStopService
lRes = ControlService(lHwndService, SERVICE_CONTROL_STOP, tServiceStatus)
Case Else
Debug.Print "Invalid Service State"
Debug.Assert False
End Select
If lRes Then
'Success
ServiceStateChange = True
Else
'Failed
ServiceStateChange = False
Debug.Print "Error in ServiceStateChange: " & Err.LastDllError
Debug.Assert False
End If
CloseServiceHandle lHwndService
End If
CloseServiceHandle lHwndSManager
Else
Debug.Print "Failed to open service mananger!"
Debug.Assert False
ServiceStateChange = False
End If
End Function
'Demonstration routine using the "Windows Time" service
Sub Test()
Dim sStatus As String
sStatus = ServiceStatus("W32Time")
Debug.Print "Event Log is now " & sStatus
Call ServiceStateChange("W32Time", essStopService)
sStatus = ServiceStatus("W32Time")
Debug.Print "Event Log is now " & sStatus
Call ServiceStateChange("W32Time", essStartService)
sStatus = ServiceStatus("Eventlog")
Debug.Print "Event Log is now " & sStatus
End Sub
Load balance : Server 01
