unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    Str: string;
  public
    { Public declarations }
    procedure AppOnMessage(var Msg: TMsg; var Handled: Boolean);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.AppOnMessage(var Msg: TMsg; var Handled: Boolean);
begin
  with Msg do
  begin
    case Msg.message of
      WM_CHAR:
      begin
        Str := Str + Char(wParam);
        Canvas.TextOut(10,10, Str);
      end;
    end;
  end;

end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  // 윈도우 메세지가 있으면 AppOnMessage 실행하게 한다.
        Application.OnMessage := AppOnMessage;
end;

end.