unit1.pas

Delphi的简单案例

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    StatusBar1: TStatusBar;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    NMUDP1: TNMUDP;
    Label1: TLabel;
    Label2: TLabel;
    Panel5: TPanel;
    Panel2: TPanel;
    Memo2: TMemo;
    Panel3: TPanel;
    Label4: TLabel;
    Label5: TLabel;
    Edit5: TEdit;
    Panel4: TPanel;
    Memo1: TMemo;
    procedure NMUDP1DataSend(Sender: TObject);
    procedure NMUDP1DataReceived(Sender: TComponent; NumberBytes: Integer;
      FromIP: String; Port: Integer);
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    i:integer;{ Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.NMUDP1DataSend(Sender: TObject);
begin
    StatusBar1.Panels[0].Text:='数据发送成功！';
end;

procedure TForm1.NMUDP1DataReceived(Sender: TComponent;
  NumberBytes: Integer; FromIP: String; Port: Integer);
 var MyStream:TMemoryStream;
     C:String;
begin
  MyStream := TMemoryStream.Create;
  edit5.text:=fromip;
  try
    NMUDP1.ReadStream(MyStream);
    SetLength(C, NumberBytes);
    MyStream.Read(C[1], NumberBytes);
    Memo1.Lines.Add(C);
  finally
    MyStream.Free;
  end;

end;

procedure TForm1.Button1Click(Sender: TObject);
var
  MyStream: TMemoryStream;
  C: String;
begin
  if memo2.Lines.Text='' then
  begin
  showmessage('空消息不能发出！');
  exit;
  end;
  C := memo2.Lines.text;
  NMUDP1.RemoteHost:= Edit1.Text;
  NMUDP1.RemotePort:= StrToInt(Edit2.Text);
  MyStream := TMemoryStream.Create;
  try
    MyStream.Write(C[1], Length(C));
    NMUDP1.SendStream(MyStream);
  finally
    memo2.Clear;
    MyStream.Free;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  i:=0;
end;

end.