unit mklu;

interface

uses
  Windows;

var
  m_OldMHook: HHook = 0;
  k_OldKBHook: HHook = 0;

function KbHook(code: Integer; wparam: Word; lparam: LongInt): LongInt; stdcall;
procedure KeyBoardOn;
procedure KeyBoardOff;
function MouseHook(code: Integer; wparam: Word; lparam: LongInt): LongInt;
  stdcall;
procedure MOUSEON;
procedure MouseOff;

implementation

function KbHook(code: Integer; wparam: Word; lparam: LongInt): LongInt; stdcall;
begin
  if code < 0 then
    Result := CallNextHookEx(k_oldKbHook, code, wparam, lparam)
  else
    Result := 1;
end;

// включение клавы

procedure KeyBoardOn;
begin
  if k_OldKbHook <> 0 then
  begin
    UnHookWindowshookEx(k_OldKbHook);
    k_OldKbHook := 0;
  end;
end;

// выключение клавы

procedure KeyBoardOff;
begin
  k_OldKbHook := SetWindowsHookEx(WH_KEYBOARD, @KbHook, HInstance, 0);
end;

function MouseHook(code: Integer; wparam: Word; lparam: LongInt): LongInt;
  stdcall;
begin
  if code < 0 then
    Result := CallNextHookEx(m_oldMHook, code, wparam, lparam)
  else
    Result := 1;
end;

// включение мышки

procedure MOUSEON;
begin
  if m_OldMHook <> 0 then
  begin
    UnHookWindowshookEx(m_OldMHook);
    m_OldMHook := 0;
  end;
end;

// выключение мышки

procedure MouseOff;
begin
  m_OldMHook := SetWindowsHookEx(WH_MOUSE, @MOUSEHook, HInstance, 0);
end;

end.

Пример использования:

uses mklu;

{блокировка(LockIt = true) или разблокировка(LockIt= False) клавы}

procedure LockUnlockKeyboard(LockIt: Boolean);
begin
  if LockIt then
    KeyBoardOFF
  else
    KeyBoardOn;
end;

{блокировка(LockIt = true) или разблокировка(LockIt= False) мышки}

procedure LockUnlockMouse(LockIt: Boolean);
begin
  if LockIt then
    MouseOff
  else
    MouseOn;
end;