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netserverenum (netapi32)
Enumerate all the servers on a domain or workgroup, returning an arraylist of SERVER_INFO_101 structs

C# Signature:

    public static extern int NetServerEnum(
    [MarshalAs(UnmanagedType.LPWStr)]string servername,
    int level,
    out IntPtr bufptr,
    int prefmaxlen,
    ref int entriesread,
    ref int totalentries,
    SV_101_TYPES servertype,
    [MarshalAs(UnmanagedType.LPWStr)]string domain,
    IntPtr resume_handle);

    public static extern int NetApiBufferFree(IntPtr buffer);

VB Signature:

    Private Declare Unicode Function NetServerEnum Lib "netapi32" _
    (ByVal Servername As IntPtr, _
    ByVal Level As Integer, _
    ByRef bufptr As IntPtr, _
    ByVal PrefMaxLen As Integer, _
    ByRef entriesread As Integer, _
    ByRef TotalEntries As Integer, _
    ByVal serverType As Integer, _
    ByVal Domain As IntPtr, _
    ByVal ResumeHandle As IntPtr) As Integer



Tips & Tricks:

Please add some!

Sample Code:

using System;
using System.Runtime.InteropServices;
using System.Collections ;

namespace Win32
    /// <summary>
    /// Summary description for Class1.
    /// </summary>
    public class NetApi32
        // constants
        public const uint ERROR_SUCCESS        = 0;
        public const uint ERROR_MORE_DATA    = 234;
        public enum SV_101_TYPES:uint
            SV_TYPE_WORKSTATION= 0x00000001,
            SV_TYPE_SERVER= 0x00000002,
            SV_TYPE_SQLSERVER = 0x00000004,
            SV_TYPE_DOMAIN_CTRL= 0x00000008,
            SV_TYPE_DOMAIN_BAKCTRL= 0x00000010,
            SV_TYPE_TIME_SOURCE= 0x00000020,
            SV_TYPE_AFP= 0x00000040,
            SV_TYPE_NOVELL= 0x00000080,
            SV_TYPE_DOMAIN_MEMBER = 0x00000100,
            SV_TYPE_PRINTQ_SERVER = 0x00000200,
            SV_TYPE_DIALIN_SERVER = 0x00000400,
            SV_TYPE_XENIX_SERVER = 0x00000800,
            SV_TYPE_SERVER_UNIX = 0x00000800,
            SV_TYPE_NT = 0x00001000,
            SV_TYPE_WFW = 0x00002000,
            SV_TYPE_SERVER_MFPN= 0x00004000,
            SV_TYPE_SERVER_NT = 0x00008000,
            SV_TYPE_POTENTIAL_BROWSER = 0x00010000,
            SV_TYPE_BACKUP_BROWSER= 0x00020000,
            SV_TYPE_MASTER_BROWSER= 0x00040000,
            SV_TYPE_DOMAIN_MASTER = 0x00080000,
            SV_TYPE_SERVER_OSF= 0x00100000,
            SV_TYPE_SERVER_VMS= 0x00200000,
            SV_TYPE_WINDOWS= 0x00400000,
            SV_TYPE_DFS= 0x00800000,
            SV_TYPE_CLUSTER_NT= 0x01000000,
            SV_TYPE_TERMINALSERVER= 0x02000000,
            SV_TYPE_CLUSTER_VS_NT = 0x04000000,
            SV_TYPE_DCE= 0x10000000,
            SV_TYPE_ALTERNATE_XPORT= 0x20000000,
            SV_TYPE_LOCAL_LIST_ONLY= 0x40000000,
            SV_TYPE_DOMAIN_ENUM= 0x80000000,
            SV_TYPE_ALL= 0xFFFFFFFF

            public struct SERVER_INFO_101
            public UInt32 sv101_platform_id;
            public string sv101_name;

            [MarshalAs(System.Runtime.InteropServices.UnmanagedType.U4)] public UInt32 sv101_version_major;
            [MarshalAs(System.Runtime.InteropServices.UnmanagedType.U4)] public UInt32 sv101_version_minor;
            [MarshalAs(System.Runtime.InteropServices.UnmanagedType.U4)] public UInt32 sv101_type;
            [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)] public string sv101_comment;
        public enum PLATFORM_ID
            PLATFORM_ID_DOS = 300,
            PLATFORM_ID_OS2 = 400,
            PLATFORM_ID_NT = 500,
            PLATFORM_ID_OSF = 600,
            PLATFORM_ID_VMS = 700

        public static extern int NetServerEnum( [MarshalAs(UnmanagedType.LPWStr)]string servername,
            int level,
            out IntPtr bufptr,
            int prefmaxlen,
            ref int entriesread,
            ref int totalentries,
            SV_101_TYPES servertype,
            [MarshalAs(UnmanagedType.LPWStr)]string domain,
            IntPtr resume_handle);

        public static extern int
            NetApiBufferFree(IntPtr buffer);

        [DllImport ("Netapi32", CharSet=CharSet.Unicode)]
        private static extern int NetMessageBufferSend(
            string servername,
            string msgname,
            string fromname,
            string buf,
            int buflen);

        public static int NetMessageSend(string serverName,string messageName,string fromName,string strMsgBuffer, int iMsgBufferLen)
       return NetMessageBufferSend(serverName,messageName,fromName,strMsgBuffer,iMsgBufferLen*2);

        public static ArrayList GetServerList( NetApi32.SV_101_TYPES ServerType)
            int entriesread=0,totalentries=0;
            ArrayList alServers = new  ArrayList();

                // Buffer to store the available servers
                // Filled by the NetServerEnum function
                IntPtr buf = new IntPtr();

                SERVER_INFO_101 server;
                int ret = NetServerEnum(null,101,out buf,-1,
                    ref entriesread,ref totalentries,

                // if the function returned any data, fill the tree view
                if(    ret == ERROR_SUCCESS    ||
                    ret == ERROR_MORE_DATA    ||
                    entriesread > 0)
                    IntPtr ptr = buf;

                    for(int i=0; i<entriesread; i++)
                        // cast pointer to a SERVER_INFO_101 structure
                        server = (SERVER_INFO_101)Marshal.PtrToStructure(ptr,typeof(SERVER_INFO_101));

                        //Cast the pointer to a ulong so this addition will work on 32-bit or 64-bit systems.
                        ptr = (IntPtr)((ulong)ptr + (ulong)Marshal.SizeOf(server));

                        // add the machine name and comment to the arrayList.
                        //You could return the entire structure here if desired
                         alServers.Add( server);

                // free the buffer

                entriesread < totalentries &&
                entriesread != 0

             return alServers;

Alternative Managed API:

Do you know one? Please contribute it!

The System.Data.Sql.SqlDataSourceEnumerator class is an alternative to this API, for enumerating SQL Servers on a network.


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