向窗体上添加一个TUdpSocket组件,如图1所示。
![](http://image49.360doc.com/DownloadImg/2012/02/2115/21692143_3.jpg)
图1 主界面
TUdpSocket组件中有两个属性——LocalHostName和LocalHostAddr,其中分别存储了本地计算机的主机名和IP地址,所以在窗体的初始化中添加如下响应代码来显示主机名和IP地址:
procedure TForm1.FormCreate(Sender: TObject);
begin
self.Caption:=UdpSocket1.LocalHostName;
self.Caption:=self.Caption ’:’ UdpSocket1.LocalHostAddr;
end;
程序代码如下:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Sockets, ExtCtrls;
type
TForm1 = class(TForm)
UdpSocket1: TUdpSocket;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
self.Caption:=UdpSocket1.LocalHostName;
self.Caption:=self.Caption ’:’ UdpSocket1.LocalHostAddr;
end;
end.
保存文件,然后按F9键运行程序,程序运行结果如图2所示。
![](http://image49.360doc.com/DownloadImg/2012/02/2115/21692143_4.jpg)