unit1.pas

< Delphi网络通信协议分析与应用实现>>一书的源代码。

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls,winsock;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Edit2: TEdit;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
var
  wVersionRequested : WORD;
  wsaData : TWSAData;
begin
  {Start up WinSock}
  wVersionRequested := MAKEWORD(1, 1);
  WSAStartup(wVersionRequested, wsaData);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  phost : PHostEnt;
  s : pchar;
  buf:string;
begin
  {获得计算机名}
  getmem(s,1024);
  try
    strpcopy(s,edit1.text);
    phost := GetHostByName(s);
    if phost<>nil then
        begin
            buf:=phost^.h_Name;
            edit2.text:=copy(buf,1,pos('.',buf)-1);
        end
    else
        edit2.text:='Failed';
  finally
    freemem(s);
  end;
end;


procedure TForm1.FormDestroy(Sender: TObject);
begin
  {Shut down WinSock}
  WSACleanup;
end;

end.