André Hentschel <nerv at dawncrow.de> wrote: > + if (!pfwi->hwnd || pfwi->cbSize < sizeof(FLASHWINFO)) > + { > + SetLastError(ERROR_INVALID_PARAMETER); > + return FALSE; > + } I don't see in your tests the case for 'cbSize > sizeof(FLASHWINFO)'. Also using !IsWindow() instead of !hwnd would fix one more test case. -- Dmitry.