Function FtpGetFileA 

pub unsafe extern "system" fn FtpGetFileA(
    hconnect: *const c_void,
    lpszremotefile: PCSTR,
    lpsznewfile: PCSTR,
    ffailifexists: BOOL,
    dwflagsandattributes: u32,
    dwflags: u32,
    dwcontext: usize,
) -> BOOL