b.pas

采用Delphi编程

unit b;

interface

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

type
  TForm1 = class(TForm)
    udp1: TCnUDP;
    mmo1: TMemo;
    btn1: TButton;
    procedure udp1DataReceived(Sender: TComponent; Buffer: Pointer;
      Len: Integer; FromIP: String; Port: Integer);
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.udp1DataReceived(Sender: TComponent; Buffer: Pointer;
  Len: Integer; FromIP: String; Port: Integer);
begin
 mmo1.Lines.Add(FromIP);
end;

procedure TForm1.btn1Click(Sender: TObject);
var
 sSTring:String;
 cChar:array [1..1024] of Char;
begin
sSTring:='您好！';
StrPCopy(@cChar,sSTring);
udp1.SendBuffer(@cChar,Length(sSTring),true);
end;

end.