 
            步骤3:编写下载代码在按钮的`OnClick`事件中编写下载代码。这里假设我们使用`TIdHTTP`组件来进行下载,确保在项目中包含必要的Indy单元。```pascalusesIdHTTP,SysUtils;procedureTForm1.Button1Click(Sender:TObject);varIdHTTP:TIdHTTP;URL:string;Response:string;beginIdHTTP:=TIdHTTP.Create(nil);tryURL:='http://example.com/yourfile.txt';//替换为实际下载链接Response:=IdHTTP.Get(URL);Memo1.Lines.Text:=Response;//显示下载内容exceptonE:ExceptiondoShowMessage('下载失败:'+E.Message);end;IdHTTP.Free;end;```