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netuserenum (netapi32)
 
.
Summary
The NetUserEnum function provides information about all user accounts on a server.

C# Signature:

    [DllImport("Netapi32.dll")]
       extern static int NetUserEnum([MarshalAs(UnmanagedType.LPWStr)]
       string servername,
       int level,
       int filter,
       out IntPtr bufptr,
       int prefmaxlen,
       out int entriesread,
       out int totalentries,
       out int resume_handle);

VB Signature:

    Public Declare Function NetUserEnum Lib "Netapi32.dll" ( _
    <MarshalAs(UnmanagedType.LPWStr)> ByVal servername As String, _
    ByVal level As Integer, _
    ByVal filter As Integer, _
    ByRef bufptr As IntPtr, _
    ByVal prefmaxlen As Integer, _
    ByRef entriesread As Integer, _
    ByRef totalentries As Integer, _
    ByRef resume_handle As Integer) As Integer

User-Defined Types:

// Passing -1 as prefmaxlen makes the system allocate the buffer.

        // LMCONS.h

const int MAX_PREFERRED_LENGTH = -1;

// You'll need these for the return values

        // LMERR.h

const int NERR_Success = 0; /* Success */

const int NERR_BASE = 2100;

const int NERR_InvalidComputer = (NERR_BASE+251); /* This computer name is invalid. */

        // WINERROR.h

const int ERROR_ACCESS_DENIED = 5;

const int ERROR_MORE_DATA = 234;

// Passing this for 'filter'

        // LMACCESS.h

const int FILTER_TEMP_DUPLICATE_ACCOUNT = 0x0001;

const int FILTER_NORMAL_ACCOUNT = 0x0002;

const int FILTER_INTERDOMAIN_TRUST_ACCOUNT = 0x0008;

const int FILTER_WORKSTATION_TRUST_ACCOUNT = 0x0010;

const int FILTER_SERVER_TRUST_ACCOUNT = 0x0020;

Notes:

[2005-06-15] VB sample contributed by Graeme Grant

[2006-03-09] VB sample fixed by Jaime Smith (can't cast Int32 to IntPtr, users and Users cannot both be used in the same scope in VB)

[2009-05-20] C# sample fixed by IEBasara

Tips & Tricks:

Please add some!

Sample Code:

VB

    Dim _users As New ArrayList
    Dim EntriesRead As Integer
    Dim TotalEntries As Integer
    Dim [Resume] As Integer
    Dim bufPtr As IntPtr

    NetUserEnum(server, 0, 2, bufPtr, -1, EntriesRead, TotalEntries, [Resume])
    If EntriesRead > 0 Then
        Dim Users(EntriesRead) As USER_INFO_0
        Dim iter As IntPtr = bufPtr
        Dim i As Integer
        For i = 0 To EntriesRead - 1
        Users(i) = CType(Marshal.PtrToStructure(iter, GetType(USER_INFO_0)), USER_INFO_0)
        iter = New IntPtr(iter.ToInt32 + Marshal.SizeOf(GetType(USER_INFO_0)))

        _users.Add(Users(i).Username)
        Next i
        NetApiBufferFree(bufPtr)
    End If

[C#]

    ArrayList users = new ArrayList();
    int EntriesRead;
    int TotalEntries;
    int Resume;
    IntPtr bufPtr;

    NetUserEnum(server, 0, FILTER_NORMAL_ACCOUNT, out bufPtr, MAX_PREFERRED_LENGTH, out EntriesRead, out TotalEntries, out Resume);
    if(EntriesRead> 0)
    {
        IntPtr iter = bufPtr;
        for(int i=0; i < EntriesRead; i++)
        {
            USER_INFO_0 anUser = (USER_INFO_0)Marshal.PtrToStructure(iter, typeof(USER_INFO_0));
            iter = (IntPtr)((int)iter + Marshal.SizeOf(typeof(USER_INFO_0)));

            users.Add(anUser.name);
        }
        NetApiBufferFree(bufPtr);
    }

Alternative Managed API:

Do you know one? Please contribute it!

using System.DirectoryServices; //System.DirectoryServices

        DirectoryEntry directoryEntry = new DirectoryEntry("WinNT://" + Environment.MachineName);

        foreach (DirectoryEntry child in directoryEntry.Children) {
        if (child.SchemaClassName == "User") {
            PropertyCollection props = child.Properties;
            userNames += child.Name + "{" + child.Guid + "}" + Environment.NewLine;

        }
        }

Documentation
NetUserEnum on MSDN

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