Stopping / Starting Windows Services With VB

[jlegan]

I found the following code to Stop and Start Windows services but I have run into a problem. This code can only stop a service if all of the services that are dependent on it are stopped first. Is there any way to programtically do this like possibly enumerate them or do I have to code for every possible dependent service?

Any help is appreciated.

Jim

'API Constants 
Public Const SERVICES_ACTIVE_DATABASE = "ServicesActive" 
' Service Control 
Public Const SERVICE_CONTROL_STOP = &H1 
Public Const SERVICE_CONTROL_PAUSE = &H2 
' Service State - for CurrentState 
Public Const SERVICE_STOPPED = &H1 
Public Const SERVICE_START_PENDING = &H2 
Public Const SERVICE_STOP_PENDING = &H3 
Public Const SERVICE_RUNNING = &H4 
Public Const SERVICE_CONTINUE_PENDING = &H5 
Public Const SERVICE_PAUSE_PENDING = &H6 
Public Const SERVICE_PAUSED = &H7 
'Service Control Manager object specific access types 
Public Const STANDARD_RIGHTS_REQUIRED = &HF0000 
Public Const SC_MANAGER_CONNECT = &H1 
Public Const SC_MANAGER_CREATE_SERVICE = &H2 
Public Const SC_MANAGER_ENUMERATE_SERVICE = &H4 
Public Const SC_MANAGER_LOCK = &H8 
Public Const SC_MANAGER_QUERY_LOCK_STATUS = &H10 
Public Const SC_MANAGER_MODIFY_BOOT_CONFIG = &H20 
Public 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) 
'Service object specific access types 
Public Const SERVICE_QUERY_CONFIG = &H1 
Public Const SERVICE_CHANGE_CONFIG = &H2 
Public Const SERVICE_QUERY_STATUS = &H4 
Public Const SERVICE_ENUMERATE_DEPENDENTS = &H8 
Public Const SERVICE_START = &H10 
Public Const SERVICE_STOP = &H20 
Public Const SERVICE_PAUSE_CONTINUE = &H40 
Public Const SERVICE_INTERROGATE = &H80 
Public Const SERVICE_USER_DEFINED_CONTROL = &H100 
Public 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) 
 
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 
 
Declare Function CloseServiceHandle Lib "advapi32.dll" (ByVal hSCObject As Long) As Long 
Declare Function ControlService Lib "advapi32.dll" (ByVal hService As Long, ByVal dwControl As Long, 
lpServiceStatus As SERVICE_STATUS) As Long 
Declare Function OpenSCManager Lib "advapi32.dll" Alias "OpenSCManagerA" (ByVal lpMachineName As 
String, ByVal lpDatabaseName As String, ByVal dwDesiredAccess As Long) As Long 
Declare Function OpenService Lib "advapi32.dll" Alias "OpenServiceA" (ByVal hSCManager As Long, ByVal 
lpServiceName As String, ByVal dwDesiredAccess As Long) As Long 
Declare Function QueryServiceStatus Lib "advapi32.dll" (ByVal hService As Long, lpServiceStatus As 
SERVICE_STATUS) As Long 
Declare Function StartService Lib "advapi32.dll" Alias "StartServiceA" (ByVal hService As Long, ByVal 
dwNumServiceArgs As Long, ByVal lpServiceArgVectors As Long) As Long 
 
Public Function ServiceStatus(ComputerName As String, ServiceName As String) As String 
    Dim ServiceStat As SERVICE_STATUS 
    Dim hSManager As Long 
    Dim hService As Long 
    Dim hServiceStatus As Long 
 
    ServiceStatus = "" 
    hSManager = OpenSCManager(ComputerName, SERVICES_ACTIVE_DATABASE, 
SC_MANAGER_ALL_ACCESS) 
    If hSManager <> 0 Then 
        hService = OpenService(hSManager, ServiceName, SERVICE_ALL_ACCESS) 
        If hService <> 0 Then 
            hServiceStatus = QueryServiceStatus(hService, ServiceStat) 
            If hServiceStatus <> 0 Then 
                Select Case ServiceStat.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 
            CloseServiceHandle hService 
        End If 
        CloseServiceHandle hSManager 
    End If 
End Function 
 
Public Sub ServicePause(ComputerName As String, ServiceName As String) 
    Dim ServiceStatus As SERVICE_STATUS 
    Dim hSManager As Long 
    Dim hService As Long 
    Dim res As Long 
 
    hSManager = OpenSCManager(ComputerName, SERVICES_ACTIVE_DATABASE, 
SC_MANAGER_ALL_ACCESS) 
    If hSManager <> 0 Then 
        hService = OpenService(hSManager, ServiceName, SERVICE_ALL_ACCESS) 
        If hService <> 0 Then 
            res = ControlService(hService, SERVICE_CONTROL_PAUSE, ServiceStatus) 
            CloseServiceHandle hService 
        End If 
        CloseServiceHandle hSManager 
    End If 
End Sub 
 
Public Sub ServiceStart(ComputerName As String, ServiceName As String) 
    Dim ServiceStatus As SERVICE_STATUS 
    Dim hSManager As Long 
    Dim hService As Long 
    Dim res As Long 
 
    hSManager = OpenSCManager(ComputerName, SERVICES_ACTIVE_DATABASE, 
SC_MANAGER_ALL_ACCESS) 
    If hSManager <> 0 Then 
        hService = OpenService(hSManager, ServiceName, SERVICE_ALL_ACCESS) 
        If hService <> 0 Then 
            res = StartService(hService, 0, 0) 
            CloseServiceHandle hService 
        End If 
        CloseServiceHandle hSManager 
    End If 
End Sub 
 
Public Sub ServiceStop(ComputerName As String, ServiceName As String) 
    Dim ServiceStatus As SERVICE_STATUS 
    Dim hSManager As Long 
    Dim hService As Long 
    Dim res As Long 
 
    hSManager = OpenSCManager(ComputerName, SERVICES_ACTIVE_DATABASE, 
SC_MANAGER_ALL_ACCESS) 
    If hSManager <> 0 Then 
        hService = OpenService(hSManager, ServiceName, SERVICE_ALL_ACCESS) 
        If hService <> 0 Then 
            res = ControlService(hService, SERVICE_CONTROL_STOP, ServiceStatus) 
            CloseServiceHandle hService 
        End If 
        CloseServiceHandle hSManager 
    End If 
End Sub 
 
 
 
Put the following code in the form: 
 
'Usage: the first parameter is the remote computer name, if it is "" the computer is the local 
computer, the second is the service name. 
Private Sub Command1_Click() 
    ServiceStop "", "Schedule" 
End Sub 
 
Private Sub Command2_Click() 
    ServiceStart "", "Schedule" 
End Sub 
 
Private Sub Command3_Click() 
    ServicePause "", "Schedule" 
End Sub 
 
Private Sub Command4_Click() 
    MsgBox ServiceStatus("", "Schedule") 
End Sub

[vbNeo]

What are you trying to stop? You could do some tracing to see what it's dependant on and illeminate thoose first.

[jlegan]

Yea I am going to enumerate the entire service section of the registry, read the Dependent Service value and search for the one I need to close. If I find a match I will add them to an array for shut down later on. Once all of the depenent services are closed I will close the one I need to and then restart them in reverse order.

[vbNeo]

Yeah - so what I said was pseudo pseudo code, and yours was pseudo... =)