在Delhpi中得到本地IP地址，并计算出本网段的所有IP地址（可用于广播）

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, Winsock, StrUtils;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Label2: TLabel;
    Edit2: TEdit;
    GroupBox1: TGroupBox;
    Button1: TButton;
    GroupBox2: TGroupBox;
    ListBox1: TListBox;
    StatusBar1: TStatusBar;
    GroupBox3: TGroupBox;
    Button2: TButton;
    GroupBox4: TGroupBox;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    procedure Button1Click(Sender: TObject);
    function LocalIP():string;
    function GetIPHead(theIP: String ):String;
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

//将IP写入控件
procedure TForm1.Button1Click(Sender: TObject);
var
  theIP : String;
  thePo : Integer;
begin
  theIP := LocalIP();
  theP