VB获取所有网卡MAC地址

Option Explicit Public Const NCBASTAT As Long = &H33 Public Const NCBNAMSZ As Long = 16 Public Const NCBENUM As Long = &H37 Public Const HEAP_ZERO_MEMORY As Long = &H8 Public Const HEAP_GENERATE_EXCEPTIONS As Long = &H4 Public Const NCBRESET As Long = &H32 Private Const MAX_LANA As Long = 255 Public Type NET_CONTROL_BLOCK 'NCB ncb_command As Byte ncb_retcode As Byte ncb_lsn As Byte ncb_num As Byte ncb_buffer As Long ncb_length As Integer ncb_callname As String * NCBNAMSZ ncb_name As String * NCBNAMSZ ncb_rto As Byte ncb_sto As Byte ncb_post As Long ncb_lana_num As Byte ncb_cmd_cplt As Byte ncb_reserve(9) As Byte ' Reserved,must be 0 ncb_event As Long End Type Public Type ADAPTER_STATUS adapter_address(5) As Byte rev_major As Byte reserved0 As Byte adapter_type As Byte rev_minor As Byte 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 Public Type NAME_BUFFER name As String * NCBNAMSZ name_num As Byte name_flags As Byte End Type Public Type ASTAT adapt As ADAPTER_STATUS NameBuff(30) As NAME_BUFFER End Type Public Type LANA_ENUM length As Byte lana(MAX_LANA) As Byte End Type Public Declare Function Netbios Lib "netapi32.dll" (pncb As NET_CONTROL_BLOCK) As Byte Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any,ByVal hpvSource As Long,ByVal cbCopy As Long) Public Declare Function GetProcessHeap Lib "kernel32" () As Long Public Declare Function HeapAlloc Lib "kernel32" (ByVal hHeap As Long,ByVal dwFlags As Long,ByVal dwBytes As Long) As Long Public Declare Function HeapFree Lib "kernel32" (ByVal hHeap As Long,lpMem As Any) As Long '获取第一块网卡的MAC地址，通常为第一块有线网卡，如果禁用网卡或拔掉网线，将获取不到MAC地址 Public Function GetMACAddress() As String 'retrieve the MAC Address for the network controller 'installed,returning a formatted string Dim tmp As String Dim pASTAT As Long Dim NCB As NET_CONTROL_BLOCK Dim AST As ASTAT 'The IBM NetBIOS 3.0 specifications defines four basic 'NetBIOS environments under the NCBRESET command. Win32 'follows the OS/2 Dynamic Link Routine (DLR) environment. 'This means that the first NCB issued by an application 'must be a NCBRESET,with the exception of NCBENUM. 'The Windows NT implementation differs from the IBM 'NetBIOS 3.0 specifications in the NCB_CALLNAME field. NCB.ncb_command = NCBRESET Call Netbios(NCB) 'To get the Media Access Control (MAC) address for an 'ethernet adapter programmatically,use the Netbios() 'NCBASTAT command and provide a "*" as the name in the 'NCB.ncb_CallName field (in a 16-chr string). NCB.ncb_callname = "* " NCB.ncb_command = NCBASTAT 'For machines with multiple network adapters you need to 'enumerate the LANA numbers and perform the NCBASTAT 'command on each. Even when you have a single network 'adapter,it is a good idea to enumerate valid LANA numbers 'first and perform the NCBASTAT on one of the valid LANA 'numbers. It is considered bad programming to hardcode the 'LANA number to 0 (see the comments section below). NCB.ncb_lana_num = 0 NCB.ncb_length = Len(AST) pASTAT = HeapAlloc(GetProcessHeap(),HEAP_GENERATE_EXCEPTIONS Or HEAP_ZERO_MEMORY,NCB.ncb_length) If pASTAT = 0 Then Debug.Print "memory allocation failed!" Exit Function End If NCB.ncb_buffer = pASTAT Call Netbios(NCB) CopyMemory AST,NCB.ncb_buffer,Len(AST) tmp = FormatHex(AST.adapt.adapter_address(0)) & "-" & _ FormatHex(AST.adapt.adapter_address(1)) & "-" & _ FormatHex(AST.adapt.adapter_address(2)) & "-" & _ FormatHex(AST.adapt.adapter_address(3)) & "-" & _ FormatHex(AST.adapt.adapter_address(4)) & "-" & _ FormatHex(AST.adapt.adapter_address(5)) HeapFree GetProcessHeap(),pASTAT GetMACAddress = tmp End Function '获取所有网卡的MAC地址，经测试，只有正在使用中的网卡能成功获取MAC地址 Public Function GetAllMacAddress() As String On Error GoTo err_handle Dim tmp As String Dim pASTAT As Long Dim pLANAENUM As Long Dim NCB As NET_CONTROL_BLOCK Dim AST As ASTAT Dim arrZero() As Byte Dim lana_enum1 As LANA_ENUM Dim i As Integer Dim strRet As String ReDim arrZero(Len(NCB)) CopyMemory NCB,VarPtr(arrZero(0)),Len(NCB) ReDim arrZero(Len(lana_enum1)) CopyMemory lana_enum1,Len(lana_enum1) NCB.ncb_command = NCBENUM NCB.ncb_buffer = VarPtr(lana_enum1) NCB.ncb_length = Len(lana_enum1) Call Netbios(NCB) For i = 0 To lana_enum1.length - 1 strRet = strRet & vbCrLf & "lana(" & i & ")=" & lana_enum1.lana(i) ReDim arrZero(Len(NCB)) CopyMemory NCB,Len(NCB) NCB.ncb_command = NCBRESET NCB.ncb_lana_num = lana_enum1.lana(i) Call Netbios(NCB) ReDim arrZero(Len(NCB)) CopyMemory NCB,Len(NCB) ReDim arrZero(Len(AST)) CopyMemory AST,Len(AST) NCB.ncb_command = NCBASTAT NCB.ncb_lana_num = lana_enum1.lana(i) NCB.ncb_callname = "* " NCB.ncb_buffer = VarPtr(AST) NCB.ncb_length = Len(AST) Call Netbios(NCB) tmp = FormatHex(AST.adapt.adapter_address(0)) & "-" & _ FormatHex(AST.adapt.adapter_address(1)) & "-" & _ FormatHex(AST.adapt.adapter_address(2)) & "-" & _ FormatHex(AST.adapt.adapter_address(3)) & "-" & _ FormatHex(AST.adapt.adapter_address(4)) & "-" & _ FormatHex(AST.adapt.adapter_address(5)) strRet = strRet & " MAC=" & tmp Next GetAllMacAddress = strRet Exit Function err_handle: MsgBox Err.Description End Function Private Function FormatHex(val As Byte) As String ' FormatHex = Right$("0" & Hex(val),2) FormatHex = IIf(val < 16,"0" & Hex(val),Hex(val)) End Function

Comments Other hardware and software may be assigned their own MAC addresses. For example,a modem can have a MAC address. Also,a RAS client or server can install "dummy" network adapters that correspond to a dialup or serial connection. Normally,these MAC addresses are randomly generated. If an adapter status is called on a LANA that corresponds to one of these adapters when no connection is present,Netbios returns error 0x34 (NRC_ENVNOTDEF) even if a reset was previously performed. With the NetBEUI and IPX transports,the same information can be obtained at a command prompt by using: net config workstation The ID given is the MAC address. How to Use LANA Numbers in a 32-bit Environment Last reviewed: August 7,1996 Article ID: Q138037 The information in this article applies to: Microsoft Win32 Software Development Kit (SDK) versions 3.1,3.5,3.51,4.0 SUMMARY NetBIOS uses the concept of a LANA (LAN adapter number) that allows you to write transport-independent NetBIOS applications. This article describes what a LANA is and recommends an approach to writing NetBIOS applications. MORE INFORMATION A LANA is a field of the NetBIOS NCB structure. In IBM's NetBIOS 3.0 specification,a LANA was used to specify a particular network adapter,as NetBIOS then supported up to two network adapters in one PC computer. Specifying a LANA of zero directed a request to the first adapter,and specifying a LANA of one directed a request to the second adapter. Originally,IBM sent NetBIOS packets over the NetBEUI protocol,also known as the NetBIOS Frames protocol. This was the only transport NetBIOS could use to send data across the network. In other words,each network adapter had only one protocol to send and receive NetBIOS packets. Because most computers have only one network adapter,many MS-DOS-based applications send all their requests to a LANA value of zero (also called simply 'LANA zero'). If a second network adapter is installed,some programs allow the user to configure the application to use LANA one instead. As a result,LANA zero became a default setting,though it was never intended to be a default. Today's network technology allows NetBIOS to use transports other than NetBEUI. Microsoft has extended the meaning of LANA to indicate a specific transport on a specific adapter. For example,if you have two network adapters,and have IPX/SPX and NetBEUI transports installed,you have four LANAs. The LANAs may or may not be sequential,and there is no systematic way to identify which transport maps to which LANA. In addition to extending the meaning of a LANA,Microsoft also added an NCB command (NCBENUM) that returns an array of available LANA numbers. As an example,the LANA_ENUM structure filled by NCBENUM might hold an array with values 0,3,5,and 6. Zero might map to IPX/SPX on the first adapter,three might map to NETBEUI on a second adapter,and so on. In Windows NT and Windows 95,network adapters consist of physical adapters (like a 3Com Etherlink II) and software adapters (like the Dial Up Adapter). In addition,a user may have TCP/IP,NETBEUI,IPX/SPX,and other transports installed,all of which have NetBIOS support. For Windows NT,LANAs are configurable through the control panel. Choose the Network applet,choose the NetBIOS Interface component,then choose Configure. A dialog appears that allows you to edit the LANAs. For Windows 95,you may only set LANA zero,the default protocol,and if no protocol is set as default,there won't be a LANA zero. You can set the default protocol in the control panel. Choose the Network applet,choose the protocol you want as default,choose Properties,the Advanced tab,and finally check 'Set this protocol to be the default protocol'. LANAs may seem like a constraint that your application must work around. However,making your application ignorant of how users want to configure their machines is a powerful idea,and one that makes life easier for your customers. The best way to write a NetBIOS application is to support all LANAs,and establish connections over any LANA. A good approach is outlined in the following steps: Enumerate the LANAs by submitting NCBENUM. Reset each LANA by submitting one NCBRESET per LANA. Add your local NetBIOS name to each LANA. The name may be the same on each LANA. Connect using any LANA: For servers,submit an NCBLISTEN on each LANA. If necessary,cancel any outstanding listen after the first listen is satisfied. For clients,submit an NCBFINDNAME (Windows NT only) or an NCBCALL (either Windows NT or Windows 95) on each LANA. The first successful find name or call will indicate which LANA to use. When using NCBCALL instead of NCBFINDNAME,you must cancel any pending NCBCALLs and hang up the extra completed calls (when two or more calls are successful.) It is a good idea to submit NCBADDNAME,NCBLISTEN,NCBFINDNAME,and NCBCALL asynchronously. Asynchronous requests will be processed almost in parallel on each transport. This architecture is quite beneficial. Once your application is written to establish connections in this manner,it will support any transport that NetBIOS can use. As a result,your customers will not have to configure anything within your application,and your application will not be affected by dynamic LANAs such as dial-up adapters or plug-and-play hardware.

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