pub unsafe fn DsGetDcOpenA<P0, P1, P2>(
    dnsname: P0,
    optionflags: u32,
    sitename: P1,
    domainguid: Option<*const GUID>,
    dnsforestname: P2,
    dcflags: u32,
    retgetdccontext: *mut HANDLE
) -> u32
where P0: IntoParam<PCSTR>, P1: IntoParam<PCSTR>, P2: IntoParam<PCSTR>,