Microsoft KB Archive/175472

= How To Get Network Adapter Address from Visual Basic =

Article ID: 175472

Article Last Modified on 7/13/2004

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APPLIES TO


 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 6.0 Professional Edition
 * Microsoft Visual Basic 4.0 Enterprise Edition
 * Microsoft Visual Basic 5.0 Enterprise Edition
 * Microsoft Visual Basic 6.0 Enterprise Edition

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This article was previously published under Q175472



SUMMARY
IPX and NETBIOS interfaces require network addresses. This article presents a step-by-step example on how to use Netbios API call to get the network adapter addresses from Microsoft Visual Basic.



Step-by-Step Example
 Create a new Standard EXE from Visual Basic. Form1 is created by default. Add a CommandButton to Form1. Its default name is Command1.  Add the following code to the General Declarations section of Form1: Option Explicit

Private Const NCBASTAT = &H33 Private Const NCBNAMSZ = 16 Private Const HEAP_ZERO_MEMORY = &H8 Private Const HEAP_GENERATE_EXCEPTIONS = &H4 Private Const NCBRESET = &H32

Private Type NCB ncb_command As Byte 'Integer ncb_retcode As Byte 'Integer ncb_lsn As Byte 'Integer ncb_num As Byte ' Integer ncb_buffer As Long 'String ncb_length As Integer ncb_callname As String * NCBNAMSZ ncb_name As String * NCBNAMSZ ncb_rto As Byte 'Integer ncb_sto As Byte ' Integer ncb_post As Long ncb_lana_num As Byte 'Integer ncb_cmd_cplt As Byte 'Integer ncb_reserve(9) As Byte ' Reserved, must be 0 ncb_event As Long End Type Private Type ADAPTER_STATUS adapter_address(5) As Byte 'As String * 6 rev_major As Byte 'Integer reserved0 As Byte 'Integer adapter_type As Byte 'Integer rev_minor As Byte 'Integer duration As Integer frmr_recv As Integer frmr_xmit As Integer iframe_recv_err As Integer xmit_aborts As Integer xmit_success As Long recv_success As Long iframe_xmit_err As Integer recv_buff_unavail As Integer t1_timeouts As Integer ti_timeouts As Integer Reserved1 As Long free_ncbs As Integer max_cfg_ncbs As Integer max_ncbs As Integer xmit_buf_unavail As Integer max_dgram_size As Integer pending_sess As Integer max_cfg_sess As Integer max_sess As Integer max_sess_pkt_size As Integer name_count As Integer End Type Private Type NAME_BUFFER name As String * NCBNAMSZ name_num As Integer name_flags As Integer End Type Private Type ASTAT adapt As ADAPTER_STATUS NameBuff(30) As NAME_BUFFER End Type

Private Declare Function Netbios Lib "netapi32.dll" _ (pncb As NCB) As Byte Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _          hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long) Private Declare Function GetProcessHeap Lib "kernel32" As Long Private Declare Function HeapAlloc Lib "kernel32" _ (ByVal hHeap As Long, ByVal dwFlags As Long, _          ByVal dwBytes As Long) As Long Private Declare Function HeapFree Lib "kernel32" (ByVal hHeap As Long, _          ByVal dwFlags As Long, lpMem As Any) As Long

  Add the following code to Command1_Click event procedure: Sub Command1_Click Dim myNcb As NCB Dim bRet As Byte myNcb.ncb_command = NCBRESET bRet = Netbios(myNcb)

myNcb.ncb_command = NCBASTAT myNcb.ncb_lana_num = 0 myNcb.ncb_callname = "*              "

Dim myASTAT As ASTAT, tempASTAT As ASTAT Dim pASTAT As Long myNcb.ncb_length = Len(myASTAT) Debug.Print Err.LastDllError pASTAT = HeapAlloc(GetProcessHeap, HEAP_GENERATE_EXCEPTIONS _               Or HEAP_ZERO_MEMORY, myNcb.ncb_length) If pASTAT = 0 Then Debug.Print "memory allcoation failed!" Exit Sub End If      myNcb.ncb_buffer = pASTAT bRet = Netbios(myNcb) Debug.Print Err.LastDllError CopyMemory myASTAT, myNcb.ncb_buffer, Len(myASTAT) MsgBox Hex(myASTAT.adapt.adapter_address(0)) & " " & _ Hex(myASTAT.adapt.adapter_address(1)) _ & " " & Hex(myASTAT.adapt.adapter_address(2)) & " " _ & Hex(myASTAT.adapt.adapter_address(3)) _ & " " & Hex(myASTAT.adapt.adapter_address(4)) & " " _ & Hex(myASTAT.adapt.adapter_address(5)) HeapFree GetProcessHeap, 0, pASTAT End Sub

 Press the F5 key to run the program. Click on Command1. Note that the network adapter address is displayed in a message box.</ol>

Additional query words: KBINetDev VKBWinAPI kbdsi kbDSupport kbVBp kbVBp400 kbVBp500 kbVBp600

Keywords: kbhowto kbapi kbnetbios kbnetwork KB175472

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