[Belfigor]

Нашел более интересный на мой взгляд вариант:

Код:

#Include <WinAPI.au3>
_WinAPI_DrawLine($hDC, $iX1, $iY1, $iX2, $iY2)

Рабочий пример:

Код:

#include <WindowsConstants.au3>
#include <WinAPI.au3>

ShowCross(@DesktopWidth / 2, @DesktopHeight / 2, 20, 2, 0xFF, 3000)

Func ShowCross($start_x, $start_y, $length, $width, $color, $time)
    Local $hDC, $hPen, $obj_orig

    $hDC = _WinAPI_GetWindowDC(0) ; DC of entire screen (desktop)
    $hPen = _WinAPI_CreatePen($PS_SOLID, $width, $color)
    $obj_orig = _WinAPI_SelectObject($hDC, $hPen)
    
    _WinAPI_DrawLine($hDC, $start_x - $length, $start_y, $start_x - 5, $start_y) ; horizontal left
    _WinAPI_DrawLine($hDC, $start_x + $length, $start_y, $start_x + 5, $start_y) ; horizontal right
    _WinAPI_DrawLine($hDC, $start_x, $start_y - $length, $start_x, $start_y - 5) ; vertical up
    ;   _WinAPI_DrawLine($hDC, $start_x, $start_y + $length, $start_x, $start_y + 5) ; vertical down
    _WinAPI_MoveTo($hDC, $start_x, $start_y + $length)
    _WinAPI_LineTo($hDC, $start_x, $start_y + 5)

    Sleep($time) ; show cross over screen for defined seconds

    ; refresh desktop (clear cross)
    _WinAPI_RedrawWindow(_WinAPI_GetDesktopWindow(), 0, 0, $RDW_INVALIDATE + $RDW_ALLCHILDREN)

    ; clear resources
    _WinAPI_SelectObject($hDC, $obj_orig)
    _WinAPI_DeleteObject($hPen)
    _WinAPI_ReleaseDC(0, $hDC)
EndFunc   ;==>ShowCross