// [MS-RPRN] interface
[
    uuid(12345678-1234-ABCD-EF00-0123456789AB),
    version(1.0), 
    ms_union,
    endpoint("ncacn_np:[\\pipe\\spoolss]"),
    pointer_default(unique)
]
interface winspool {

import "ms-dtyp.idl";

const int a = 0xff & level;
typedef struct _PORT_CONTAINER {
    DWORD Level;
    [switch_is(0x0000fff & Level)] 
      union {
      [case(1)]
        PORT_INFO_1* pPortInfo1;
      [case(2)]
        PORT_INFO_2* pPortInfo2;
      [case(3)]
        PORT_INFO_3* pPortInfo3;
      [case(0x00FFFFFF)]
        PORT_INFO_FF* pPortInfoFF;
    } PortInfo;
} PORT_CONTAINER;
}