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EnumServicesStatus (advapi32)
 
.
Summary
Enumerates services in the specified service control manager database. The name and status of each service are provided, long with additional data based on the specified information level.
Summary
The EnumServicesStatus function enumerates services in the specified service control manager database. The name and status of each service are provided.

C# Signature:

      [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
      static extern bool EnumServicesStatusEx(IntPtr hSCManager,
      int infoLevel, int dwServiceType,
      int dwServiceState, IntPtr lpServices, UInt32 cbBufSize,
      out uint pcbBytesNeeded, out uint lpServicesReturned,
      ref uint lpResumeHandle, string pszGroupName);

VB Signature:

TODO

User-Defined Types:

(see example code below).

[DllImport("advapi32.dll", EntryPoint="EnumServicesStatusW", ExactSpelling=true, SetLastError=true)]
static extern bool EnumServicesStatus( IntPtr hSCManager,
                    SERVICE_TYPES dwServiceType,
                    SERVICE_STATES dwServiceState,
                    IntPtr lpServices,
                    int cbBufSize,
                    ref int pcbBytesNeeded,
                    ref int lpServicesReturned,
                    ref int lpResumeHandle );

Alternative Managed API:

There is no known alternative managed API as of .Net 3.5/

VB.NET Signature:

Notes:

This works on both 32 bit and 64 bit machines.

  <DllImportAttribute("advapi32.dll", _
              EntryPoint:="EnumServicesStatusW", _
              SetLastError:=True, _
              ExactSpelling:=True, _
              CharSet:=CharSet.Unicode, _
              CallingConvention:=CallingConvention.StdCall)> _
  Shared Function EnumServicesStatus _
            (ByVal hSCManager As IntPtr, _
             ByVal dwServiceType As Integer, _
             ByVal dwServiceState As Integer, _
             ByVal lpServices As IntPtr, _
             ByVal cbBufSize As Integer, _
             ByRef pcbBytesNeeded As Integer, _
             ByRef lpServicesReturned As Integer, _
             ByRef lpResumeHandle As Integer) As Boolean
  End Function

Tips & Tricks:

As usual when doing pinvoke operations, watch out for 64 bit vs 32 bit and packing boundaries.

Sample Code:

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Runtime.InteropServices;
    using System.Security.Permissions;

      [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
      internal static ENUM_SERVICE_STATUS_PROCESS[] GetServices()
     {
     List<ENUM_SERVICE_STATUS_PROCESS> result = new List<ENUM_SERVICE_STATUS_PROCESS>();

User-Defined Types:

     IntPtr handle = IntPtr.Zero;
     IntPtr buf = IntPtr.Zero;
     try
        {
        handle = OpenSCManager(null, null, (int)ServiceControlManagerType.SC_MANAGER_ALL_ACCESS);
        if (handle != IntPtr.Zero)
           {
           uint iBytesNeeded = 0;
           uint iServicesReturned = 0;
           uint iResumeHandle = 0;

VB.NET:

           ENUM_SERVICE_STATUS_PROCESS infoLevel = new ENUM_SERVICE_STATUS_PROCESS();
           if (!EnumServicesStatusEx(handle, SC_ENUM_PROCESS_INFO, (int)ServiceType.SERVICE_WIN32, (int)ServiceStateRequest.SERVICE_STATE_ALL, IntPtr.Zero, 0, out iBytesNeeded, out iServicesReturned, ref iResumeHandle, null))
          {
          // allocate our memory to receive the data for all the services (including the names)
          buf = Marshal.AllocHGlobal((int)iBytesNeeded);

          if (!EnumServicesStatusEx(handle, SC_ENUM_PROCESS_INFO, (int)ServiceType.SERVICE_WIN32, (int)ServiceStateRequest.SERVICE_STATE_ALL, buf, iBytesNeeded, out iBytesNeeded, out iServicesReturned, ref iResumeHandle, null))
             throw new Win32Exception(Marshal.GetLastWin32Error());
  'Windows constants
  Public Const SERVICE_STATE_ALL = &H3

          ENUM_SERVICE_STATUS_PROCESS serviceStatus;
  '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

          // check if 64 bit system which has different pack sizes
          if (IntPtr.Size == 8)
             {
             long pointer = buf.ToInt64();
             for (int i = 0; i < (int)iServicesReturned; i++)
            {
            serviceStatus = (ENUM_SERVICE_STATUS_PROCESS)Marshal.PtrToStructure(new IntPtr(pointer),
               typeof(ENUM_SERVICE_STATUS_PROCESS));
            result.Add(serviceStatus);
  Public Const SERVICE_WIN32 As Long = SERVICE_WIN32_OWN_PROCESS Or _
                       SERVICE_WIN32_SHARE_PROCESS

            // incremement by sizeof(ENUM_SERVICE_STATUS_PROCESS) allow Packing of 8
            pointer += ENUM_SERVICE_STATUS_PROCESS.SizePack8;
            }

             }
          else
             {
             int pointer = buf.ToInt32();
             for (int i = 0; i < (int)iServicesReturned; i++)
            {
            serviceStatus = (ENUM_SERVICE_STATUS_PROCESS)Marshal.PtrToStructure(new IntPtr(pointer),
               typeof(ENUM_SERVICE_STATUS_PROCESS));
            result.Add(serviceStatus);
  Public Const SERVICE_DRIVER As Long = SERVICE_KERNEL_DRIVER Or
                    SERVICE_FILE_SYSTEM_DRIVER Or _
                    SERVICE_RECOGNIZER_DRIVER

            // incremement by sizeof(ENUM_SERVICE_STATUS_PROCESS) allow Packing of 4
            pointer += ENUM_SERVICE_STATUS_PROCESS.SizePack4;
            }
             }
          }
           }
        }
     catch(Exception e)
        {
        ;
        }
     finally
        {
        if (handle != IntPtr.Zero)
           CloseServiceHandle(handle);
  Public Const SERVICE_TYPE_ALL As Long = SERVICE_WIN32 Or _
                      SERVICE_ADAPTER Or _
                      SERVICE_DRIVER Or _
                      SERVICE_INTERACTIVE_PROCESS

        if (buf != IntPtr.Zero)
           Marshal.FreeHGlobal(buf);
        }

     return result.ToArray();
     }

Notes:

None.

      private const int SC_ENUM_PROCESS_INFO = 0;

Tips & Tricks:

Please add some!

      [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
      private static extern bool EnumServicesStatusEx(IntPtr hSCManager,
      int infoLevel, int dwServiceType,
      int dwServiceState, IntPtr lpServices, UInt32 cbBufSize,
      out uint pcbBytesNeeded, out uint lpServicesReturned,
      ref uint lpResumeHandle, string pszGroupName);

Sample Code:

C#

IntPtr handle = OpenSCManager( null, null, SCM_ACCESS.SC_MANAGER_ALL_ACCESS );
if ( handle != IntPtr.Zero )
{
    int iBytesNeeded = 0;
    int iServicesReturned = 0;
    int iResumeHandle = 0;

    if ( !EnumServicesStatus( handle,
        SERVICE_TYPES.SERVICE_WIN32,
        SERVICE_STATES.SERVICE_STATE_ALL,
        IntPtr.Zero,
        0,
        ref iBytesNeeded,
        ref iServicesReturned,
        ref iResumeHandle ) )
    {
        IntPtr buf = Marshal.AllocHGlobal( (int) iBytesNeeded );
        if ( !EnumServicesStatus( handle,
            SERVICE_TYPES.SERVICE_WIN32,
            SERVICE_STATES.SERVICE_STATE_ALL,
            buf,
            iBytesNeeded,
            ref iBytesNeeded,
            ref iServicesReturned,
            ref iResumeHandle ) )
            Debug.WriteLine("EnumServicesStatus Failed " + Marshal.GetLastWin32Error() );
        else
        {
            ENUM_SERVICE_STATUS serviceStatus;
            int iPtr = buf.ToInt32();
            for ( int i = 0 ; i < (int) iServicesReturned; i++ )
            {
                serviceStatus = (ENUM_SERVICE_STATUS) Marshal.PtrToStructure(
                    new IntPtr(iPtr),
                    typeof(ENUM_SERVICE_STATUS) );
                Debug.WriteLine("Service " + serviceStatus.pServiceName );
                iPtr += ENUM_SERVICE_STATUS.SizeOf;
            }
            Debug.WriteLine("EnumServicesStatus Success");
        }
    }
}

Alternative Managed API:

Do you know one? Please contribute it!

      [StructLayout(LayoutKind.Sequential, Pack = 4)]
      internal struct ENUM_SERVICE_STATUS_PROCESS
     {
     internal static readonly int SizePack4 = Marshal.SizeOf(typeof(ENUM_SERVICE_STATUS_PROCESS));

     /// <summary>
     /// sizeof(ENUM_SERVICE_STATUS_PROCESS) allow Packing of 8 on 64 bit machines
     /// </summary>
     internal static readonly int SizePack8 = Marshal.SizeOf(typeof(ENUM_SERVICE_STATUS_PROCESS)) + 4;

     [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
     internal string pServiceName;

     [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
     internal string pDisplayName;

     internal SERVICE_STATUS_PROCESS ServiceStatus;
     }

      [StructLayout(LayoutKind.Sequential)]
      internal struct SERVICE_STATUS_PROCESS
     {
     public int serviceType;
     public int currentState;
     public int controlsAccepted;
     public int win32ExitCode;
     public int serviceSpecificExitCode;
     public int checkPoint;
     public int waitHint;
     public int processId;
     public int serviceFlags;
     }

      private enum ServiceType { SERVICE_KERNEL_DRIVER = 0x1, SERVICE_FILE_SYSTEM_DRIVER = 0x2, SERVICE_WIN32_OWN_PROCESS = 0x10, SERVICE_WIN32_SHARE_PROCESS = 0x20, SERVICE_INTERACTIVE_PROCESS = 0x100, SERVICETYPE_NO_CHANGE = SERVICE_NO_CHANGE, SERVICE_WIN32 = (SERVICE_WIN32_OWN_PROCESS | SERVICE_WIN32_SHARE_PROCESS) }

      private enum ServiceStateRequest { SERVICE_ACTIVE = 0x1, SERVICE_INACTIVE = 0x2, SERVICE_STATE_ALL = (SERVICE_ACTIVE | SERVICE_INACTIVE) }

      private enum ServiceControlManagerType { SC_MANAGER_CONNECT = 0x1, SC_MANAGER_CREATE_SERVICE = 0x2, SC_MANAGER_ENUMERATE_SERVICE = 0x4, SC_MANAGER_LOCK = 0x8, SC_MANAGER_QUERY_LOCK_STATUS = 0x10, SC_MANAGER_MODIFY_BOOT_CONFIG = 0x20, SC_MANAGER_ALL_ACCESS = STANDARD_RIGHTS_REQUIRED | SC_MANAGER_CONNECT | SC_MANAGER_CREATE_SERVICE | SC_MANAGER_ENUMERATE_SERVICE | SC_MANAGER_LOCK | SC_MANAGER_QUERY_LOCK_STATUS | SC_MANAGER_MODIFY_BOOT_CONFIG }

Documentation
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