1unit Unit1;
 2
 3interface
 4
 5uses
 6  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 7  Dialogs, StdCtrls,WinSock, Sockets;
 8
 9type
10  TForm1 = class(TForm)
11    Button1: TButton;
12    procedure Button1Click(Sender: TObject);
13  private
14    { Private declarations }
15  public
16    { Public declarations }
17  end;
18
19var
20  Form1: TForm1;
21  Function sendarp(ipaddr:ulong;temp:dword;ulmacaddr:pointer;ulmacaddrleng:pointer):DWord;StdCall;External 'Iphlpapi.dll' Name 'SendARP';
22implementation
23
24{$R *.dfm}
25
26procedure TForm1.Button1Click(Sender: TObject);
27var
28  mymac:array[0..5] of byte;
29  mymaclength:ulong;
30  tmp:TInAddr;
31  sip:string;
32  tp:ttcpclient;
33begin
34  sip:='172.20.104.111';
35  mymaclength:=length(mymac);
36  if sendarp(inet_addr(pChar(sip)),0,@mymac,@mymaclength)=0 then
37  begin
38    tmp.S_addr:=inet_addr(pChar(sip));
39    ShowMessage(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]]));
40  end;
41  tp:=ttcpclient.create(self);
42  tp.close;
43  tp.open;
44  ShowMessage(tp.LocalHostName);
45  ShowMessage(tp.LocalHostAddr);
46  tp.close;
47end;
48
49end.
50

转载于:https://www.cnblogs.com/zhaoyong/archive/2009/07/03/1515997.html