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enumservicesstatus (advapi32)
 
.
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", 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 );

VB.NET Signature:

  <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

User-Defined Types:

VB.NET:

  'Windows constants
  Public Const SERVICE_STATE_ALL = &H3

  '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

Notes:

None.

Tips & Tricks:

Please add some!

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");
        }
    }
}

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