unit Unit1;

interface

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

type
    TconnThread = class (TThread)
    //继承自TThread类
    private
      procedure conn;
    protected
      procedure Execute;override;
end;

type
  TForm1 = class(TForm)
    IdFTP1: TIdFTP;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure IdFTP1Status(ASender: TObject; const AStatus: TIdStatus;
      const AStatusText: String);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
{TConnThread}
procedure TConnThread.conn;
begin
    Form1.IdFTP1.Connect(True,5000);
end;

procedure TconnThread.Execute;
begin
    inherited;
    conn;
end;

procedure TForm1.Button1Click(Sender: TObject);
var connthread: TconnThread;
begin
    connthread:=TconnThread.Create(False);
    connthread.FreeOnTerminate:=true;

end;

procedure TForm1.IdFTP1Status(ASender: TObject; const AStatus: TIdStatus;
  const AStatusText: String);
begin
      Self.Caption:=AStatusText;
end;

end.