unit1.pas

学习Delphi最好的教材。通过一个个简单而实用的实例

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Sockets, StdCtrls, ExtCtrls, NMUDP;

type
  TForm1 = class(TForm)
    Edit1: TLabeledEdit;
    Edit2: TLabeledEdit;
    Edit3: TLabeledEdit;
    Edit4: TLabeledEdit;
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    UDP1: TNMUDP;
    Memo2: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure UDP1DataReceived(Sender: TComponent; NumberBytes: Integer;
      FromIP: String; Port: Integer);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    procedure SendString(s:string);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.SendString(s:string);
var
  i:Integer;
  Buff:array[1..100] of char;
begin
  for i:=1 to Length(s) do
    Buff[i]:=s[i];
  Buff[Length(s)+1]:=#0;
  UDP1.SendBuffer(Buff,100);
  Memo1.Lines.Add('[发]'+s)
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
//  SendString(Edit5.Text);
  SendString(Memo2.Text);
end;

procedure TForm1.UDP1DataReceived(Sender: TComponent; NumberBytes: Integer;
  FromIP: String; Port: Integer);
var
  l:Integer;
  Buff:array[1..100] of char;
begin
  l:=100;
  UDP1.ReadBuffer(Buff,l);
  Memo1.Lines.Add('[收]'+Buff);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  UDP1.LocalPort:=StrToInt(Edit2.Text);
  UDP1.RemoteHost:=Edit3.Text;
  UDP1.RemotePort:=StrToInt(Edit4.Text);
end;

end.