通过IP取MAC地址

uses
  WinSock;

Function sendarp(ipaddr:ulong;
                 temp:dword;
                 ulmacaddr:pointer;
                 ulmacaddrleng:pointer) : DWord; StdCall; External 'Iphlpapi.dll' Name 'SendARP';

procedure TForm1.Button1Click(Sender: TObject);
var
  myip:ulong;
  mymac:array[0..5] of byte;
  mymaclength:ulong;
  r:integer;
begin
  myip:=inet_addr(PChar('192.168.6.180'));
  mymaclength:=length(mymac);
  r:=sendarp(myip,0,@mymac,@mymaclength);
  label1.caption:='errorcode:'+inttostr(r);
  label2.caption:=format('%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x',[mymac[0],mymac[1],mymac[2],mymac[3],mymac[4],mymac[5]]);
end; 

 2006-4-29 19:53:30    2、取MAC地址 （含多网卡）unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  WinSock, StdCtrls;

Const
  MAX_HOSTNAME_LEN               = 128; { from IPTYPES.H }
  MAX_DOMAIN_NAME_LEN            = 128;
  MAX_SCOPE_ID_LEN               = 256;
  MAX_ADAPTER_NAME_LENGTH        = 256;
  MAX_ADAPTER_DESCRIPTION_LENGTH = 128;
  MAX_ADAPTER_ADDRESS_LENGTH     = 8;

Type
  TIPAddressString = Array[0..4*4-1] of Char;

  PIPAddrString = ^TIPAddrString;
  TIPAddrString = Record
    Next      : PIPAddrString;
    IPAddress : TIPAddressString;
    IPMask    : TIPAddressString;
    Context   : Integer;
  End;

  PFixedInfo = ^TFixedInfo;
  TFixedInfo = Record { FIXED_INFO }
    HostName         : Array[0..MAX_HOSTNAME_LEN+3] of Char;
    DomainName       : Array[0..MAX_DOMAIN_NAME_LEN+3] of Char;
    CurrentDNSServer : PIPAddrString;
    DNSServerList    : TIPAddrString;
    NodeType         : Integer;
    ScopeId          : Array[0..MAX_SCOPE_ID_LEN+3] of Char;
    EnableRouting    : Integer;
    EnableProxy      : Integer;
    EnableDNS        : Integer;
  End;

  PIPAdapterInfo = ^TIPAdapterInfo;
  TIPAdapterInfo = Record { IP_ADAPTER_INFO }
    Next                : PIPAdapterInfo;
    ComboIndex          : Integer;
    AdapterName         : Array[0..MAX_ADAPTER_NAME_LENGTH+3] of Char;
    Description         : Array[0..MAX_ADAPTER_DESCRIPTION_LENGTH+3] of Char;
    AddressLength       : Integer;
    Address             : Array[1..MAX_ADAPTER_ADDRESS_LENGTH] of Byte;
    Index               : Integer;
    _Type               : Integer;
    DHCPEnabled         : Integer;
    CurrentIPAddress    : PIPAddrString;
    IPAddressList       : TIPAddrString;
    GatewayList         : TIPAddrString;
    DHCPServer          : TIPAddrString;
    HaveWINS            : Bool;
    PrimaryWINSServer   : TIPAddrString;
    SecondaryWINSServer : TIPAddrString;
    LeaseObtained       : Integer;
    LeaseExpires        : Integer;
  End;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    procedure GetAdapterInformation;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

Function sendarp(ipaddr:ulong;
                 temp:dword;
                 ulmacaddr:pointer;
                 ulmacaddrleng:pointer) : DWord; StdCall;

implementation

{$R *.dfm}

Function sendarp; External 'Iphlpapi.dll' Name 'SendARP';
Function GetAdaptersInfo(AI : PIPAdapterInfo; Var BufLen : Integer) : Integer;
         StdCall; External 'iphlpapi.dll' Name 'GetAdaptersInfo';

procedure TForm1.GetAdapterInformation;
Var
  AI,Work : PIPAdapterInfo;
  Size    : Integer;
  Res     : Integer;
  I       : Integer;

  Function MACToStr(ByteArr : PByte; Len : Integer) : String;
  Begin
    Result := '';
    While (Len > 0) do Begin
      Result := Result+IntToHex(ByteArr^,2)+'-';
      ByteArr := Pointer(Integer(ByteArr)+SizeOf(Byte));
      Dec(Len);
    End;
    SetLength(Result,Length(Result)-1); { remove last dash }
  End;

  Function GetAddrString(Addr : PIPAddrString) : String;
  Begin
    Result := '';
    While (Addr <> nil) do Begin
      Result := Result+'A: '+Addr^.IPAddress+' M: '+Addr^.IPMask+#13;
      Addr := Addr^.Next;
    End;
  End;

  Function TimeTToDateTimeStr(TimeT : Integer) : String;
  Const UnixDateDelta = 25569; { days between 12/31/1899 and 1/1/1970 }
  Var
    DT  : TDateTime;
    TZ  : TTimeZoneInformation;
    Res : DWord;

  Begin
    If (TimeT = 0) Then Result := ''
    Else Begin
      { Unix TIME_T is secs since 1/1/1970 }
      DT := UnixDateDelta+(TimeT / (24*60*60)); { in UTC }
      { calculate bias }
      Res := GetTimeZoneInformation(TZ);
      If (Res = TIME_ZONE_ID_INVALID) Then RaiseLastWin32Error;
      If (Res = TIME_ZONE_ID_STANDARD) Then Begin
        DT := DT-((TZ.Bias+TZ.StandardBias) / (24*60));
        Result := DateTimeToStr(DT)+' '+WideCharToString(TZ.StandardName);
      End
      Else Begin { daylight saving time }
        DT := DT-((TZ.Bias+TZ.DaylightBias) / (24*60));
        Result := DateTimeToStr(DT)+' '+WideCharToString(TZ.DaylightName);
      End;
    End;
  End;

begin
  Memo1.Lines.Clear;
  Size := 5120;
  GetMem(AI,Size);
  Res := GetAdaptersInfo(AI,Size);
  If (Res <> ERROR_SUCCESS) Then Begin
    SetLastError(Res);
    RaiseLastWin32Error;
  End;
  With Memo1,Lines do Begin
    Work := AI;
    I := 1;
    Repeat
      Add('');
      Add('Adapter ' + IntToStr(I));
      Add('  ComboIndex: '+IntToStr(Work^.ComboIndex));
      Add('  Adapter name: '+Work^.AdapterName);
      Add('  Description: '+Work^.Description);
      Add('  Adapter address: '+MACToStr(@Work^.Address,Work^.AddressLength));
      Add('  Index: '+IntToStr(Work^.Index));
      Add('  Type: '+IntToStr(Work^._Type));
      Add('  DHCP: '+IntToStr(Work^.DHCPEnabled));
      Add('  Current IP: '+GetAddrString(Work^.CurrentIPAddress));
      Add('  IP addresses: '+GetAddrString(@Work^.IPAddressList));
      Add('  Gateways: '+GetAddrString(@Work^.GatewayList));
      Add('  DHCP servers: '+GetAddrString(@Work^.DHCPServer));
      Add('  Has WINS: '+IntToStr(Integer(Work^.HaveWINS)));
      Add('  Primary WINS: '+GetAddrString(@Work^.PrimaryWINSServer));
      Add('  Secondary WINS: '+GetAddrString(@Work^.SecondaryWINSServer));
      Add('  Lease obtained: '+TimeTToDateTimeStr(Work^.LeaseObtained));
      Add('  Lease expires: '+TimeTToDateTimeStr(Work^.LeaseExpires));
      Inc(I);
      Work := Work^.Next;
    Until (Work = nil);
  End;
  FreeMem(AI);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  GetAdapterInformation;
end;

end.