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library My_Hook;


uses
  Windows,
  Messages;

{$R *.res}


Const WM_HOOKMESSAGEID = WM_USER + 5000;


Type  THookProc = function (nCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall;


var   HookHandle    : Cardinal = 0;
      WindowHandle  : Cardinal = 0;

// -------------------------------------------------------------------------- //

function KeyboardHookProc(nCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall;
begin
 Result := CallNextHookEx(HookHandle, nCode, wParam, lParam);
 case nCode < 0 of
 TRUE  : exit;
 FALSE : begin
          Postmessage(WindowHandle,WM_HOOKMESSAGEID,Integer(wParam),Integer(LPARAM));
         end;
 end;
end;

// -------------------------------------------------------------------------- //

function InstallKeyboardHook(Hwnd: Cardinal): Boolean; stdcall;
 begin
  Result := False;
  if HookHandle = 0 then
   begin //Erstmal Hook installieren //First install the hook
    HookHandle := SetWindowsHookEx(WH_KEYBOARD, @KeyboardHookProc, HInstance, 0); //Uebergebenes Fensterhandle sichern //Save the given window handle
    WindowHandle := Hwnd;
    Result := TRUE;
  end;
end;

// -------------------------------------------------------------------------- //

function InstallHook( IDHook : integer; HookProc : THookProc ): Cardinal; stdcall;
 begin
  Result := 0;
  if (HookHandle = 0)AND(@HookProc<>NIL) then
   begin
    HookHandle := SetWindowsHookEx(IDHook, @HookProc, HInstance, 0);
    Result := HookHandle;
  end;
end;

// -------------------------------------------------------------------------- //

function UninstallHook: Boolean; stdcall;
 begin
  Result := UnhookWindowsHookEx(HookHandle);
  HookHandle := 0;
end;

// -------------------------------------------------------------------------- //

exports
 InstallKeyboardHook,
 InstallHook,
 UninstallHook;

// -------------------------------------------------------------------------- //

begin

end.// ------------------------------------------------------------------ FIN //