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)
Debug.Print res
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

Private Sub Command1_Click()
ServiceCommand "Themes", 1
End Sub

Private Sub Command2_Click()
ServiceCommand "Themes", 2
End Sub

这是我写好的，怎么没用，请问各位，问题出在哪里？