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Private Const NCBASTAT As Integer = &H33

Private Const NCBENUM As Integer = &H37

Private Const NCBNAMSZ As Integer = 16

Private Const NCBRESET As Integer = &H32

        /// <summary> 2506 - NetBIOS returned an error: The NCB and SMB are dumped above. </summary>

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/// <param name="lpfnCB">A callback function to monitor progress or abort.</param>

    IntPtr lpfnCB);

/// <param name="lpfnCB">A callback function to monitor progress or abort.</param>

    IntPtr lpfnCB);

    IntPtr lpfnCB);

Public Declare Function URLDownloadToFileA Lib "urlmon" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long

Private Shared Function URLDownloadToFile(<MarshalAs(UnmanagedType.IUnknown)> pCaller As Object, <MarshalAs(UnmanagedType.LPWStr)> szURL As String, <MarshalAs(UnmanagedType.LPWStr)> szFileName As String, dwReserved As Int32, lpfnCB As IntPtr) As Int32

    out UCOMIStream stream, Int32 dwReserved, IntPtr lpfnCB);

    short free_ncbs;

    short max_cfg_ncbs;

    short max_ncbs;

   Dim free_ncbs As Short

   Dim max_cfg_ncbs As Short

   Dim max_ncbs As Short

   WORD    free_ncbs;

   WORD    max_cfg_ncbs;

   WORD    max_ncbs;

Private Const NCBENUM As Integer = &H37

  *  Structure returned to the NCB command NCBENUM.

Private Const NCBNAMSZ As Integer = 16

   <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=NCBNAMSZ)> Dim Name As String

   UCHAR name[NCBNAMSZ];

     public static const int NCBNAMSZ=16;

    public struct NCB

        byte ncb_command;

        byte ncb_retcode;

        byte ncb_lsn;

        byte ncb_num;

        IntPtr ncb_buffer;

        short ncb_length;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=NetbiosConstants.NCBNAMSZ)]

        String ncb_callname;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=NetbiosConstants.NCBNAMSZ)]

        String ncb_name;

        byte ncb_rto;

        byte ncb_sto;

        IntPtr ncb_post;

        byte ncb_lana_num;

        byte ncb_cmd_cplt;

        byte[] ncb_reserve;

        IntPtr ncb_event;

Private Const NCBNAMSZ As Integer = 16

Private Structure NCB

   Dim ncb_command As Byte

   Dim ncb_retcode As Byte

   Dim ncb_lsn As Byte

   Dim ncb_num As Byte

   Dim ncb_buffer As IntPtr

   Dim ncb_length As Short

   <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=NCBNAMSZ)> Dim ncb_callname As String

   <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=NCBNAMSZ)> Dim ncb_name As String

   Dim ncb_rto As Byte

   Dim ncb_sto As Byte

   Dim ncb_post As IntPtr

   Dim ncb_lana_num As Byte

   Dim ncb_cmd_cplt As Byte

   <MarshalAs(UnmanagedType.ByValArray, SizeConst:=10)> Dim ncb_reserve() As Byte

   Dim ncb_event As IntPtr

Typedef struct _NCB {

   UCHAR   ncb_command;        /* command code           */

   UCHAR   ncb_retcode;        /* return code            */

   UCHAR   ncb_lsn;        /* local session number       */

   UCHAR   ncb_num;        /* number of our network name     */

   PUCHAR  ncb_buffer;         /* address of message buffer      */

   WORD    ncb_length;         /* size of message buffer     */

   UCHAR   ncb_callname[NCBNAMSZ]; /* blank-padded name of remote    */

   UCHAR   ncb_name[NCBNAMSZ];     /* our blank-padded netname       */

   UCHAR   ncb_rto;        /* rcv timeout/retry count    */

   UCHAR   ncb_sto;        /* send timeout/sys timeout       */

   void (CALLBACK *ncb_post)( struct _NCB * ); /* POST routine address    */

   UCHAR   ncb_lana_num;       /* lana (adapter) number      */

   UCHAR   ncb_cmd_cplt;       /* 0xff => commmand pending       */

   UCHAR   ncb_reserve[18];    /* reserved, used by BIOS     */

   UCHAR   ncb_reserve[10];    /* reserved, used by BIOS     */

   HANDLE  ncb_event;          /* HANDLE to Win32 event which    */

} NCB, *PNCB;

        /// <param name="lpfnCB">A callback function to monitor progress or abort.</param>

            [MarshalAs(UnmanagedType.Interface)] IBindStatusCallback lpfnCB);

public struct _NCB

    public Commands ncb_command;      /* command code           */

    public byte   ncb_retcode;        /* return code            */

    public byte   ncb_lsn;        /* local session number       */

    public byte   ncb_num;        /* number of our network name     */

    //[MarshalAs(UnmanagedType.ByValArray, SizeConst = NCBNAMSZ)]

    public IntPtr ncb_buffer;         /* address of message buffer      */

    public ushort ncb_length;         /* size of message buffer     */

    [MarshalAs(UnmanagedType.ByValArray, SizeConst = NativeMethods.NCBNAMSZ)]

    public byte[]   ncb_callname; /* blank-padded name of remote    */

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = NativeMethods.NCBNAMSZ)]

    public byte[]   ncb_name;         /* our blank-padded netname       */

    public byte   ncb_rto;        /* rcv timeout/retry count    */

    public byte   ncb_sto;        /* send timeout/sys timeout       */

    public IntPtr postroutine;//void (CALLBACK *ncb_post)( struct _NCB * ); /* POST routine address    */

    public byte   ncb_lana_num;       /* lana (adapter) number      */

    public byte   ncb_cmd_cplt;       /* 0xff => commmand pending       */

    public byte[/*10*/]   ncb_reserve;    /* reserved, used by BIOS     */

    public IntPtr  ncb_event;         /* HANDLE to Win32 event which    */

static extern byte Netbios(ref _NCB controlBlock);

   ByRef pncb As NCB _

Private Const NCBNAMSZ As Integer = 16

Private Structure NCB

   Dim ncb_command As Byte

   Dim ncb_retcode As Byte

   Dim ncb_lsn As Byte

   Dim ncb_num As Byte

   Dim ncb_buffer As IntPtr

   Dim ncb_length As Short

   <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=NCBNAMSZ)> Dim ncb_callname As String

   <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=NCBNAMSZ)> Dim ncb_name As String

   Dim ncb_rto As Byte

   Dim ncb_sto As Byte

   Dim ncb_post As IntPtr

   Dim ncb_lana_num As Byte

   Dim ncb_cmd_cplt As Byte

   <MarshalAs(UnmanagedType.ByValArray, SizeConst:=10)> Dim ncb_reserve() As Byte

   Dim ncb_event As IntPtr

See Also: NCB, LANA_ENUM, ADAPTER_STATUS, NAME_BUFFER

Private Const NCBNAMSZ As Integer = 16

Private Const NCBRESET As Integer = &H32

Private Const NCBASTAT As Integer = &H33

Private Const NCBENUM As Integer = &H37

   Dim myNcb As New NCB

   ' load the NCB

   myNcb.ncb_command = NCBENUM

   myNcb.ncb_length = CShort(Marshal.SizeOf(myLana))

   myNcb.ncb_buffer = ptr

   bRet = Netbios(myNcb)

   myNcb.ncb_command = NCBRESET

   myNcb.ncb_lana_num = FirstLANA

   bRet = Netbios(myNcb)

   myNcb.ncb_command = NCBASTAT

   myNcb.ncb_lana_num = FirstLANA

   myNcb.ncb_callname = RemoteIP.PadRight(NCBNAMSZ, " "c)

   myNcb.ncb_buffer = ptr

   myNcb.ncb_length = CShort(Marshal.SizeOf(myASTAT))

   bRet = Netbios(myNcb)

For Windows 7 64 bit - make sure to compile platform as x86. Also, had to marshal each item in NCB structure to get it work:

  Public Structure NCB

    Public ncbCommand As Byte

    Public ncbRetcode As Byte

    Public ncbLSN As Byte

    Public ncbNum As Byte

    Public ncbBuffer As IntPtr

    Public ncbLength As Int16

           SizeConst:=netbstrcs.netNameLen)> Dim ncbCallname() As Byte

           SizeConst:=netbstrcs.netNameLen)> Dim ncbName() As Byte

    Public ncbRTO As Byte

    Public ncbSTO As Byte

    Public ncbPost As UInt32 'IntPtr

    Public ncbLANAnum As Byte

    Public ncbCmdCplt As Byte

           SizeConst:=netbstrcs.netresvLen)> Dim ncbReserve() As Byte

    Public ncbEvent As Int32 'IntPtr

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