[일반/컴포넌트] 다이얼로그 박스가 이미 떠있는지 검사하여 강제로 닫기

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Timer1: TTimer;
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Timer1.Interval := 2000;
  Timer1.Enabled  := True;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage('http://www.howto.pe.kr');
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
  XForm: TForm;
begin
  Timer1.Enabled := False;
  Timer1.Enabled := True;
  XForm := Screen.ActiveForm;

  // 이미 뜬 다이얼로그 박스가 없으면 띄운다
  if not Assigned(XForm) or (XForm.ClassName <> 'TMessageForm') then
    MessageDlg('타이머에서 뜬 폼입니다', mtInformation, [mbOK], 0)
  // 이미 뜬 폼을 닫는다  
  else if XForm.ClassName = 'TMessageForm' then
    XForm.Close;
end;

end.