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unit Unit1;

interface

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

  const
  WH_KEYBOARD_LL       =  $000D;
  LLKHF_EXTENDED       =  $0001;
  LLKHF_INJECTED       =  $0010;
  LLKHF_ALTDOWN        =  $0020;
  LLKHF_UP             =  $0080;
 


type
  tagKBDLLHOOKSTRUCT =  packed record
    vkCode :            DWORD;
    scanCode :          DWORD;
    flags :             DWORD;
    time :              DWORD;
    dwExtraInfo :       Integer;
  end;
  KBDLLHOOKSTRUCT      =  tagKBDLLHOOKSTRUCT;
  PKBDLLHOOKSTRUCT     =  ^KBDLLHOOKSTRUCT;

  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
    hkHook : HHook;
  FMemo : TMemo = nil;
  function LowLevelKeyboardProc(nCode: Integer; wParam: Integer; lParam: Integer): Integer; stdcall; export;
  procedure HookIt(Memo: TMemo);
  procedure UnHookIt;


implementation

{$R *.dfm}
procedure HookIt(Memo: TMemo);
begin
  FMemo := Memo;
  hkHook := SetWindowsHookEx(WH_KEYBOARD_LL,@LowLevelKeyboardProc,hInstance,0);
end;

procedure UnHookIt;
begin
  FMemo := nil;
  UnHookWindowsHookEx(hkHook);
end;
 
function LowLevelKeyboardProc(nCode: Integer; wParam: Integer; lParam: Integer): Integer; stdcall; export;
var  
  Hook : PKBDLLHOOKSTRUCT;
  bControlKeyDown : Boolean;
  KeyState : TKeyboardState;
  NewChar : PChar;


begin
  Hook := Pointer(lParam);
  Case nCode Of
     HC_ACTION:
      begin
      Try
        If (FMemo <> nil) And (IsWindow(FMemo.Handle)) And ((Hook^.flags And LLKHF_UP) <> 0) Then
          begin
          GetKeyboardState(KeyState);
           NewChar := AllocMem(2); //2  why


          //newchar:=pchar;
          Try
         If ToAscii(Hook^.vkCode,Hook^.scanCode,KeyState,NewChar,0)=1 Then  //ToUncode

              begin

      FMemo.Perform(WM_CHAR,Ord(NewChar[0]),0); //CREERIA QUE ESTE METODO ES MUY LENTO



            end;
          Finally
        FreeMem(NewChar);
          end;
        end;
      Finally
        Result := CallNextHookEx(hkHook,nCode,wParam,lParam);
      end;
    end;
    Else
      begin
      Result := CallNextHookEx(hkHook,nCode,wParam,lParam);
    end;
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
hookit(memo1);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
UnHookIt
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
UnHookIt;
end;

end.