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ÔÚ´Ó²½ÐÐÇл»µ½Ñ¡µ¥µÄʱºò£¬¿ÉÄÜÐèÒªÇå³ýµ±Ç°µÄ¼üÖµ¡£Èç¹û²½ÐÐÖÐʹÓÃÁËSDL_EnableKeyRepeat·½·¨°Ñ¼üÅÌµÄÆµÂʱä¸ß£¬¶ÔÓÚÑ¡µ¥À´Ëµ¾ÍÌ«¿ìÁË¡£ËùÒÔ¿ÉÄÜÒªÔÚµ÷ÓÃÑ¡µ¥Ö®Ç°Ð´ÉÏ£º
SDL_EnableKeyRepeat(0, 0);
event.key.keysym.sym := 0;
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procedure MenuSystem;
var
  menu: integer;
begin
  while (SDL_WaitEvent(@event) >= 0) do
  begin
    case event.type_ of
      SDL_QUITEV: //ÕâÀï´¦Àí´°¿ÚÍ˳öʼþ
        if messagebox(0, 'Are you sure to quit?', 'KYS Windows', MB_OKCANCEL) = IDOK then Quit;
      SDL_KEYUP:
        begin
          if (event.key.keysym.sym = sdlk_down) then
          begin
            menu := menu+1;
            if menu > 3 then menu := 0; //°´ÏÂϼüµÄÒç³ö
            showMenusystem(menu); //ÿ´Îµ±Ç°Ñ¡Öз¢Éú±ä»¯Ê±, ¾ùÖØ»­Ñ¡µ¥
          end;
          if (event.key.keysym.sym = sdlk_up) then
          begin
           


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¼¼Êõ½»Á÷,DH½²½â. Õâ¸öÊÇÔÚCSDNÉÏÃæ¿´¼ûµÄÎÊÌâ.ÎÒ˵˵×Ô¼ºµÄÏë·¨. procedure TForm1.btn1Click(Sender: TObject);
var
Str:String;
begin
Str:='abc' ;

Str:=str+'d';

str:=copy(Str,1,3);

str:=UpperCase(str);
end;
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