reactos/include/ddk/unknown.h

#ifndef __unknwn_h__
#define __unknwn_h__

#ifdef __cplusplus
extern "C" {
#include <wdm.h>
}
#else
#include <wdm.h>
#endif

#include <windef.h>
#define COM_NO_WINDOWS_H
#include <basetyps.h>
#ifdef PUT_GUIDS_HERE
#include <initguid.h>
#endif

DEFINE_GUID(IID_IUnknown, 0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
#if defined(__cplusplus) && _MSC_VER >= 1100
    struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown;
#endif

#undef INTERFACE
#define INTERFACE IUnknown
DECLARE_INTERFACE(IUnknown)
{
    STDMETHOD(QueryInterface)
    (   THIS_
        IN      REFIID,
        OUT     PVOID *
    )   PURE;

    STDMETHOD_(ULONG,AddRef)
    (   THIS
    )   PURE;

    STDMETHOD_(ULONG,Release)
    (   THIS
    )   PURE;
};
#undef INTERFACE

typedef IUnknown *PUNKNOWN;
typedef
HRESULT
(NTAPI *PFNCREATEINSTANCE)
(
  OUT PUNKNOWN *  Unknown,
  IN  REFCLSID    ClassId,
  IN  PUNKNOWN    OuterUnknown,
  IN  POOL_TYPE   PoolType
);

#endif