Visual Basic Network Services
EnumServicesStatus: Enumerate Local Machine Services and Status
     
Posted:   Tuesday May 22, 2001
Updated:   Monday December 26, 2011
     
Applies to:   VB4-32, VB5, VB6
Developed with:   VB6, Windows 2000
OS restrictions:   Windows NT3.1, Windows NT4, Windows 2000, Windows XP
Author:   VBnet - Randy Birch
     

Related:  

EnumServicesStatus: Enumerate Local Machine Services
EnumServicesStatus: Enumerate Local Machine Services and Status

EnumServicesStatus: Enumerate Local or Remote Machine Services and Status
     
 Prerequisites
One of the operating systems listed under OS Restrictions above.

This demo builds upon the EnumServicesStatus basic demo, adding functions returning both the type of service, and the type of control that the service allows (handles). It also provides for displaying only the active (running) or inactive services alone, as well as listing all services on the local machine. EnumServicesStatus requires Windows NT 3.1 or later.

 BAS Module Code
Place the following code into the general declarations area of a bas module:

Option Explicit
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Copyright 1996-2011 VBnet/Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Distribution: You can freely use this code in your own
'               applications, but you may not reproduce 
'               or publish this code on any web site,
'               online service, or distribute as source 
'               on any media without express permission.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'our own constant
Public Const SIZEOF_SERVICE_STATUS As Long = 36

'windows constants
Public Const LB_SETTABSTOPS As Long = &H192
Public Const ERROR_MORE_DATA = 234
Public Const SC_MANAGER_ENUMERATE_SERVICE = &H4

'Service State for Enum Requests (Bit Mask)
Public Const SERVICE_ACTIVE = &H1
Public Const SERVICE_INACTIVE = &H2
Public Const SERVICE_STATE_ALL = SERVICE_ACTIVE Or SERVICE_INACTIVE
                                     
'Service Types (Bit Mask)
'corresponds to SERVICE_STATUS.dwServiceType
Public Const SERVICE_KERNEL_DRIVER As Long = &H1
Public Const SERVICE_FILE_SYSTEM_DRIVER As Long = &H2
Public Const SERVICE_ADAPTER As Long = &H4
Public Const SERVICE_RECOGNIZER_DRIVER As Long = &H8
Public Const SERVICE_WIN32_OWN_PROCESS As Long = &H10
Public Const SERVICE_WIN32_SHARE_PROCESS As Long = &H20
Public Const SERVICE_INTERACTIVE_PROCESS As Long = &H100
Public Const SERVICE_WIN32 As Long = SERVICE_WIN32_OWN_PROCESS Or _
                                     SERVICE_WIN32_SHARE_PROCESS
                                     
Public Const SERVICE_DRIVER As Long = SERVICE_KERNEL_DRIVER Or _
                                      SERVICE_FILE_SYSTEM_DRIVER Or _
                                      SERVICE_RECOGNIZER_DRIVER
                                      
Public Const SERVICE_TYPE_ALL As Long = SERVICE_WIN32 Or _
                                        SERVICE_ADAPTER Or _
                                        SERVICE_DRIVER Or _
                                        SERVICE_INTERACTIVE_PROCESS
                                     
'Service State
'corresponds to SERVICE_STATUS.dwCurrentState
Public Const SERVICE_STOPPED As Long = &H1
Public Const SERVICE_START_PENDING As Long = &H2
Public Const SERVICE_STOP_PENDING As Long = &H3
Public Const SERVICE_RUNNING As Long = &H4
Public Const SERVICE_CONTINUE_PENDING As Long = &H5
Public Const SERVICE_PAUSE_PENDING As Long = &H6
Public Const SERVICE_PAUSED As Long = &H7

'Controls Accepted  (Bit Mask)
'corresponds to SERVICE_STATUS.dwControlsAccepted
Public Const SERVICE_ACCEPT_STOP As Long = &H1
Public Const SERVICE_ACCEPT_PAUSE_CONTINUE As Long = &H2
Public Const SERVICE_ACCEPT_SHUTDOWN   As Long = &H4

'Windows type used to call the Net API
Public Const MAX_PREFERRED_LENGTH As Long = -1
Public Const NERR_SUCCESS As Long = 0&

Public Const SV_TYPE_WORKSTATION         As Long = &H1
Public Const SV_TYPE_SERVER              As Long = &H2
Public Const SV_TYPE_SQLSERVER           As Long = &H4
Public Const SV_TYPE_DOMAIN_CTRL         As Long = &H8
Public Const SV_TYPE_DOMAIN_BAKCTRL      As Long = &H10
Public Const SV_TYPE_TIME_SOURCE         As Long = &H20
Public Const SV_TYPE_AFP                 As Long = &H40
Public Const SV_TYPE_NOVELL              As Long = &H80
Public Const SV_TYPE_DOMAIN_MEMBER       As Long = &H100
Public Const SV_TYPE_PRINTQ_SERVER       As Long = &H200
Public Const SV_TYPE_DIALIN_SERVER       As Long = &H400
Public Const SV_TYPE_XENIX_SERVER        As Long = &H800
Public Const SV_TYPE_SERVER_UNIX         As Long = SV_TYPE_XENIX_SERVER
Public Const SV_TYPE_NT                  As Long = &H1000
Public Const SV_TYPE_WFW                 As Long = &H2000
Public Const SV_TYPE_SERVER_MFPN         As Long = &H4000
Public Const SV_TYPE_SERVER_NT           As Long = &H8000
Public Const SV_TYPE_POTENTIAL_BROWSER   As Long = &H10000
Public Const SV_TYPE_BACKUP_BROWSER      As Long = &H20000
Public Const SV_TYPE_MASTER_BROWSER      As Long = &H40000
Public Const SV_TYPE_DOMAIN_MASTER       As Long = &H80000
Public Const SV_TYPE_SERVER_OSF          As Long = &H100000
Public Const SV_TYPE_SERVER_VMS          As Long = &H200000
Public Const SV_TYPE_WINDOWS             As Long = &H400000    'Windows95 and above
Public Const SV_TYPE_DFS                 As Long = &H800000    'Root of a DFS tree
Public Const SV_TYPE_CLUSTER_NT          As Long = &H1000000   'NT Cluster
Public Const SV_TYPE_TERMINALSERVER      As Long = &H2000000   'Terminal Server
Public Const SV_TYPE_DCE                 As Long = &H10000000  'IBM DSS or equi
Public Const SV_TYPE_ALTERNATE_XPORT     As Long = &H20000000  'return alternate transport
Public Const SV_TYPE_LOCAL_LIST_ONLY     As Long = &H40000000  'local list only
Public Const SV_TYPE_DOMAIN_ENUM         As Long = &H80000000
Public Const SV_TYPE_ALL                 As Long = &HFFFFFFFF

Public Const SV_PLATFORM_ID_OS2       As Long = 400
Public Const SV_PLATFORM_ID_NT        As Long = 500

'Mask applied to svX_version_major in
'order to obtain the major version number.
Public Const MAJOR_VERSION_MASK        As Long = &HF

Public 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

Public Type ENUM_SERVICE_STATUS
   lpServiceName As Long
   lpDisplayName As Long
   ServiceStatus As SERVICE_STATUS
End Type

Public Declare Function OpenSCManager Lib "advapi32" _
   Alias "OpenSCManagerA" _
  (ByVal lpMachineName As String, _
   ByVal lpDatabaseName As String, _
   ByVal dwDesiredAccess As Long) As Long

Public Declare Function EnumServicesStatus Lib "advapi32" _
   Alias "EnumServicesStatusA" _
  (ByVal hSCManager As Long, _
   ByVal dwServiceType As Long, _
   ByVal dwServiceState As Long, _
   lpServices As Any, _
   ByVal cbBufSize As Long, _
   pcbBytesNeeded As Long, _
   lpServicesReturned As Long, _
   lpResumeHandle As Long) As Long
   
Public Declare Function CloseServiceHandle Lib "advapi32" _
   (ByVal hSCObject As Long) As Long

Public Declare Function lstrcpyA Lib "kernel32" _
  (ByVal RetVal As String, _
   ByVal Ptr As Long) As Long
                        
Public Declare Function lstrlenA Lib "kernel32" _
  (ByVal Ptr As Any) As Long

Public Declare Function SendMessage Lib "user32" _
   Alias "SendMessageA" _
  (ByVal hwnd As Long, _
   ByVal wMsg As Long, _
   ByVal wParam As Long, _
   lParam As Any) As Long
 Form Code
To a form add three command buttons (Command1, Command2 and Command3) and a list box (List1). Add the following code:

Option Explicit

Private Sub Form_Load()
   
   ReDim TabArray(0 To 4) As Long
   
   TabArray(0) = 150
   TabArray(1) = 220
   TabArray(2) = 270
   TabArray(3) = 342
   TabArray(4) = 390

   Call SendMessage(List1.hwnd, LB_SETTABSTOPS, 0&, ByVal 0&)
   Call SendMessage(List1.hwnd, LB_SETTABSTOPS, 5&, TabArray(0))
   List1.Refresh
     
   Command1.Caption = "Active"
   Command2.Caption = "Inactive"
   Command3.Caption = "All"
   
End Sub


Private Sub Command1_Click()

  'active services
   EnumSystemServices SERVICE_ACTIVE, List1
            
End Sub


Private Sub Command2_Click()

  'inactive services
   EnumSystemServices SERVICE_INACTIVE, List1

End Sub


Private Sub Command3_Click()

  'all services
   EnumSystemServices SERVICE_STATE_ALL, List1
            
End Sub


Public Function EnumSystemServices(SERVICE_TYPE As Long, _
                                   ctl As Control) As Long

   Dim hSCManager As Long
   Dim pntr() As ENUM_SERVICE_STATUS
   Dim cbBuffSize As Long
   
   Dim cbRequired As Long
   Dim dwReturned As Long
   Dim hEnumResume As Long
   Dim cbBuffer As Long
   Dim success As Long
   Dim i As Long
   
  'these five just help keep the
  'code lines from becoming too long
  'for html display
   Dim sSvcName As String
   Dim sDispName As String
   Dim dwState As Long
   Dim dwType As Long
   Dim dwCtrls As Long
   
  'establish a connection to the service control
  'manager on the local computer and open
  'the local service control manager database.
   hSCManager = OpenSCManager(vbNullString, _
                              vbNullString, _
                              SC_MANAGER_ENUMERATE_SERVICE)

   If hSCManager <> 0 Then

     'Get buffer size by calling EnumServicesStatus.
  
     'To determine the required buffer size, call EnumServicesStatus
     'with cbBuffer and hEnumResume set to zero. EnumServicesStatus
     'fails (returns 0), and Err.LastDLLError returns ERROR_MORE_DATA,
     'filling cbRequired with the size, in bytes, of the buffer
     'required to hold the array of structures and their data.
      success = EnumServicesStatus(hSCManager, _
                                   SERVICE_WIN32, _
                                   SERVICE_TYPE, _
                                   ByVal &H0, _
                                   &H0, _
                                   cbRequired, _
                                   dwReturned, _
                                   hEnumResume)

     'If success is 0 and the LastDllError is
     'ERROR_MORE_DATA, use returned info to create
     'the required data buffer
      If success = 0 And Err.LastDllError = ERROR_MORE_DATA Then

      
        'Calculate number of structures needed
        'and redimension the array
         cbBuffer = (cbRequired \ SIZEOF_SERVICE_STATUS) + 1
         ReDim pntr(0 To cbBuffer)
   
        'Set cbBuffSize equal to the size of the buffer
         cbBuffSize = cbBuffer * SIZEOF_SERVICE_STATUS

        'Enumerate the services. If the function succeeds,
        'the return value is nonzero. If the function fails,
        'the return value is zero. In addition, hEnumResume
        'must be set to 0.
         hEnumResume = 0
         If EnumServicesStatus(hSCManager, _
                               SERVICE_WIN32, _
                               SERVICE_TYPE, _
                               pntr(0), _
                               cbBuffSize, _
                               cbRequired, _
                               dwReturned, _
                               hEnumResume) Then

           'pntr() array is now filled with service data,
           'so it is a simple matter of extracting the
           'required information.
            With ctl
            
               .Clear
               
               For i = 0 To dwReturned - 1
            
                  sDispName = GetStrFromPtrA(ByVal pntr(i).lpDisplayName)
                  sSvcName = GetStrFromPtrA(ByVal pntr(i).lpServiceName)
                  dwState = pntr(i).ServiceStatus.dwCurrentState
                  dwType = pntr(i).ServiceStatus.dwServiceType
                  dwCtrls = pntr(i).ServiceStatus.dwControlsAccepted
                     
                  .AddItem sDispName & vbTab & _
                           sSvcName & vbTab & _
                           GetServiceState(dwState) & vbTab & _
                           GetServiceType(dwType) & vbTab & _
                           GetServiceControl(dwCtrls)
                  
               Next
            End With
            
         Else
            MsgBox "EnumServicesStatus; error " & _
                      CStr(Err.LastDllError)
         End If  'If EnumServicesStatus

      Else
         MsgBox "ERROR_MORE_DATA not returned; error " & _
                   CStr(Err.LastDllError)
      End If  'If success = 0 And Err.LastDllError
   
   Else
      MsgBox "OpenSCManager failed; error = " & _
                CStr(Err.LastDllError)
   End If  'If hSCManager <> 0
   
  'clean up
   Call CloseServiceHandle(hSCManager)
   
  'return the number of services
  'returned as a sign of success
   EnumSystemServices = dwReturned

End Function


Public Function GetStrFromPtrA(ByVal lpszA As Long) As String

   GetStrFromPtrA = String$(lstrlenA(ByVal lpszA), 0)
   Call lstrcpyA(ByVal GetStrFromPtrA, ByVal lpszA)
   
End Function


Private Function GetServiceControl(dwControl As Long) As String

   Dim tmp As String

   If dwControl Then
      If (dwControl And SERVICE_ACCEPT_STOP) Then tmp = tmp & "stop, "
      If (dwControl And SERVICE_ACCEPT_PAUSE_CONTINUE) Then tmp = tmp & "pause, "
      If (dwControl And SERVICE_ACCEPT_SHUTDOWN) Then tmp = tmp & "shutdown"
   'Else
   '   tmp = vbTab
   End If

   GetServiceControl = tmp

End Function


Private Function GetServiceType(dwType As Long) As String

   Dim tmp As String
   
   If (dwType And SERVICE_WIN32_OWN_PROCESS) Then tmp = tmp & "own proc, "
   If (dwType And SERVICE_WIN32_SHARE_PROCESS) Then tmp = tmp & "share, "
   If (dwType And SERVICE_KERNEL_DRIVER) Then tmp = tmp & "kernel, "
   If (dwType And SERVICE_FILE_SYSTEM_DRIVER) Then tmp = tmp & "filesys, "
   If (dwType And SERVICE_INTERACTIVE_PROCESS) Then tmp = tmp & "interactive"
   
   GetServiceType = tmp

End Function


Private Function GetServiceState(dwState As Long) As String
   
   Select Case dwState
      Case SERVICE_STOPPED: GetServiceState = "stopped"
      Case SERVICE_START_PENDING: GetServiceState = "startpend"
      Case SERVICE_STOP_PENDING: GetServiceState = "stoppend"
      Case SERVICE_RUNNING: GetServiceState = "running"
      Case SERVICE_CONTINUE_PENDING: GetServiceState = "contpend"
      Case SERVICE_PAUSE_PENDING: GetServiceState = "pausepend"
      Case SERVICE_PAUSED: GetServiceState = "paused"
   End Select

End Function
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