Function FindWindowExA

pub unsafe fn FindWindowExA<P2, P3>(
    hwndparent: Option<HWND>,
    hwndchildafter: Option<HWND>,
    lpszclass: P2,
    lpszwindow: P3,
) -> Result<HWND>
where
    P2: Param<PCSTR>,
    P3: Param<PCSTR>,