include/guiddef.h

#ifndef GUID_DEFINED
#define GUID_DEFINED
typedef struct _GUID
{
    unsigned long  Data1;
    unsigned short Data2;
    unsigned short Data3;
    unsigned char  Data4[ 8 ];
} GUID;
#endif

#undef DEFINE_GUID

#ifdef INITGUID
#define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
        const GUID name = \
	{ l, w1, w2, { b1, b2,  b3,  b4,  b5,  b6,  b7,  b8 } }
#else
#define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8) \
    extern const GUID name
#endif

#define DEFINE_OLEGUID(name, l, w1, w2) \
	DEFINE_GUID(name, l, w1, w2, 0xC0,0,0,0,0,0,0,0x46)

#ifndef _GUIDDEF_H_
#define _GUIDDEF_H_

typedef GUID *LPGUID;
typedef GUID CLSID,*LPCLSID;
typedef GUID IID,*LPIID;
typedef GUID FMTID,*LPFMTID;

#if defined(__cplusplus) && !defined(CINTERFACE)
#define REFGUID             const GUID &
#define REFCLSID            const CLSID &
#define REFIID              const IID &
#define REFFMTID            const FMTID &
#else /* !defined(__cplusplus) && !defined(CINTERFACE) */
#define REFGUID             const GUID* const
#define REFCLSID            const CLSID* const
#define REFIID              const IID* const
#define REFFMTID            const FMTID* const
#endif /* !defined(__cplusplus) && !defined(CINTERFACE) */

#if defined(__cplusplus) && !defined(CINTERFACE)
#define IsEqualGUID(rguid1, rguid2) (!memcmp(&(rguid1), &(rguid2), sizeof(GUID)))
#else /* defined(__cplusplus) && !defined(CINTERFACE) */
#define IsEqualGUID(rguid1, rguid2) (!memcmp(rguid1, rguid2, sizeof(GUID)))
#endif /* defined(__cplusplus) && !defined(CINTERFACE) */
#define IsEqualIID(riid1, riid2) IsEqualGUID(riid1, riid2)
#define IsEqualCLSID(rclsid1, rclsid2) IsEqualGUID(rclsid1, rclsid2)

#if defined(__cplusplus) && !defined(CINTERFACE)
inline bool operator==(const GUID& guidOne, const GUID& guidOther)
{
    return !memcmp(&guidOne,&guidOther,sizeof(GUID));
}
inline bool operator!=(const GUID& guidOne, const GUID& guidOther)
{
    return !(guidOne == guidOther);
}
#endif 

extern const IID GUID_NULL;
#define IID_NULL            GUID_NULL
#define CLSID_NULL GUID_NULL
#define FMTID_NULL          GUID_NULL
   
#endif /* _GUIDDEF_H_ */