unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, IdComponent, IdTCPConnection, IdTCPClient,
  IdBaseComponent, IdAntiFreezeBase, IdAntiFreeze;

type
  TForm1 = class(TForm)
    IdAntiFreeze1: TIdAntiFreeze;
    IdTCPClient: TIdTCPClient;
    EdtHost: TEdit;
    EdtPort: TEdit;
    EdtData: TEdit;
    LbLog: TEdit;
    BtnConnect: TButton;
    BtnSend: TButton;
    BtnDisconnect: TButton;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    procedure BtnConnectClick(Sender: TObject);
    procedure BtnSendClick(Sender: TObject);
    procedure BtnDisconnectClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.BtnConnectClick(Sender: TObject);
begin
        IdTCPClient.Host := EdtHost.Text;
        IdTCPClient.Port := StrToInt(EdtPort.Text);
        LbLog.Text:='正在連接 ' + EdtHost.Text + '...';
        with IdTCPClient do
        begin
        try
        Connect(5000);
        try
        LbLog.Text :=(ReadLn());
        BtnConnect.Enabled := False;
        BtnSend.Enabled := True;
        BtnDisconnect.Enabled := True;
        except
        LbLog.Text:= '遠程主機無響應！';
        IdTCPClient.Disconnect();
        end;//end try
        except
        LbLog.Text:= '無法建立到' + EdtHost.Text + '的連接！';
        end;//end try
        end;//end with

end;

procedure TForm1.BtnSendClick(Sender: TObject);
begin
    LbLog.Text:=(EdtData.Text);
    with IdTCPClient do
    begin
    try
    WriteLn(EdtData.Text);
    LbLog.Text:=(ReadLn());
    except
    LbLog.Text := '發送數據失敗！';
    IdTCPClient.Disconnect();
    LbLog.Text:= '同主機 ' + EdtHost.Text + ' 的連接已斷開！';

    BtnConnect.Enabled := True;
    BtnSend.Enabled := False;
    BtnDisconnect.Enabled := False;
    end;//end try
    end;//end with

    end;

procedure TForm1.BtnDisconnectClick(Sender: TObject);
    var
    Received: string;
begin
    LbLog.Text:=('QUIT');
    try
    IdTCPClient.WriteLn('QUIT');
    finally
    IdTCPClient.Disconnect();
    LbLog.Text:='同主機 ' + EdtHost.Text + ' 的連接已斷開！';
    BtnConnect.Enabled := True;
    BtnSend.Enabled := False;
    BtnDisconnect.Enabled := False;
    end;//end try
    end;

end.