MIDL

define interface example:

[ object,

uuid(FC3B3F61-BCEC-11D1-91FE-E1CBED988F66)

]

interface IStack : IUnknown

{

import "unknwn.idl";

HRESULT Push([in] long value);

HRESULT Pop([out, retval] long* pVal);

HRESULT Empty([out, retval] boolean* pVal);

};

the mapping c++ code:

#include "wtypes.h"

/* {FC3B3F61-BCEC-11D1-91FE-E1CBED988F66} */

DEFINE_GUID(IID_IStack,

0xFC3B3F61, 0xBCEC, 0x11D1, 0x91, 0xFE,

0xE1, 0xCB, 0xED, 0x98, 0x8F, 0x66);

class IStack : public IUnknown {

public:

virtual HRESULT Push(long value) = 0;

virtual HRESULT Pop(long* value) = 0;

virtual HRESULT Empty(long* flag) = 0;

};

or

#include "wtypes.h"

/* {FC3B3F61-BCEC-11D1-91FE-E1CBED988F66} */

DEFINE_GUID(IID_IStack,

0xFC3B3F61, 0xBCEC, 0x11D1, 0x91, 0xFE,

0xE1, 0xCB, 0xED, 0x98, 0x8F, 0x66);

DECLARE_INTERFACE_(IStack, IUnknown)

{

// *** IStack methods *** //

STDMETHOD(Push) (THIS_ long value) PURE;

STDMETHOD(Pop) (THIS_ long* value) PURE;

STDMETHOD(Empty) (THIS_ long* flag) PURE;

};