pub unsafe extern "system" fn DsCrackSpnA(
    pszspn: PCSTR,
    pcserviceclass: *mut u32,
    serviceclass: PSTR,
    pcservicename: *mut u32,
    servicename: PSTR,
    pcinstancename: *mut u32,
    instancename: PSTR,
    pinstanceport: *mut u16
) -> u32