C# Signature:

    [DllImport("dhcpsapi.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern uint DhcpEnumServers(
        uint Flags,
        ref uint IdInfo,
        out IntPtr Servers,
        ref uint CallbackFn,
        ref uint CallbackData
    );

VB Signature:

Declare Function DhcpEnumServers Lib "dhcpsapi.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Completed library DHCP functions.

http://www.rupj.net/portfolio/dhcp-web-services.html

Sample Code:

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public class DHCPDS_SERVER
    {
        public UInt32 Version;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string ServerName;
        public UInt32 ServerAddress;
        public UInt32 Flags;
        public UInt32 State;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string DsLocation;
        public UInt32 DsLocType;
    }
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public class DHCP_SERVER_INFO_ARRAY
    {
        public UInt32 Flags;
        public UInt32 NumElements;
        public IntPtr Servers;
    }
    // This is a custom type/class
    public struct DHCP_SERVERS
    {
        public string ServerName;
        public string ServerAddress;
    }
    public DHCP_SERVERS[] GetDHCPServers()
    {
        UInt32 DHCPResult = 0;
        uint nr = 0;
        IntPtr svrs;
        DHCPResult = DhcpEnumServers(nr, ref nr, out svrs, ref nr, ref nr);
        if (DHCPResult == 0)
        {
        DHCP_SERVER_INFO_ARRAY dsArray = (DHCP_SERVER_INFO_ARRAY)Marshal.PtrToStructure(svrs, typeof(DHCP_SERVER_INFO_ARRAY));
        int size = (int)dsArray.NumElements;
        IntPtr outArray = dsArray.Servers;
        DHCPDS_SERVER[] serverList = new DHCPDS_SERVER[size];
        DHCP_SERVERS[] outlist = new DHCP_SERVERS[size];
        IntPtr current = outArray;
        for (int i = 0; i < size; i++)
        {
            serverList[i] = new DHCPDS_SERVER();
            Marshal.PtrToStructure(current, serverList[i]);
            Marshal.DestroyStructure(current, typeof(DHCPDS_SERVER));
            current = (IntPtr)((int)current + Marshal.SizeOf(serverList[i]));
            outlist[i].ServerName = serverList[i].ServerName;
            outlist[i].ServerAddress = UInt32IPAddressToString(serverList[i].ServerAddress);
        }
        Marshal.FreeCoTaskMem(outArray);
        return outlist;
        }
        return null; // no server found
    }
    private string UInt32IPAddressToString(uint ipAddress)
    {
        IPAddress ipA = new IPAddress(ipAddress);
        string[] sIp = ipA.ToString().Split('.');
        return sIp[3] + "." + sIp[2] + "." + sIp[1] + "." + sIp[0];
    }

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