implements (C++)

Specifica le interfacce dispatch forzate per essere membri della coclasse IDL.

Sintassi

[ implements(
   interfaces={interfaces}, dispinterfaces={dispinterfaces})]

Parametri

interfaces
Elenco delimitato da virgole delle interfacce che saranno membri della coclasse IDL. Un metodo abbreviato per specificare una singola interfaccia viene implementato( interface_name ).

dispinterfaces
Elenco delimitato da virgole della dispinterface che sarà un membro della coclasse IDL. Un metodo abbreviato per specificare una singola dispinterface è implements(dispinterfaces = dispinterface_name ).

Osservazioni:

Per impostazione predefinita, nella coclasse IDL vengono aggiunte solo le interfacce COM che sono classi di base di coclass . implements consente di forzare l'uso di altre interfacce come membri IDL coclass .

Requisiti

Per altre informazioni, vedere Contesti di attributi.

Esempi

L'esempio seguente si trova in tre parti: un file con estensione idl e il file H associato e un file C++.

Si supponga che il file con estensione idl seguente, che sarà disponibile per il compilatore.

// attr_implements.idl
import "docobj.idl";
[ version(1.0), uuid(0ed71801-a1b6-3178-af3b-9431fc00185e) ]
library odod
{
   importlib("stdole2.tlb");
   importlib("olepro32.dll");

   [
      object,    uuid(1AECC9BB-2104-3723-98B8-7CC54722C7DD)
   ]
   interface IBar1 {
      [id(1)] HRESULT bar1();
   };

   [
      dual,    uuid(1AECCABB-2104-3723-98B8-7CC54722C7DD)
   ]
   interface IBar2 {
      [id(1)] HRESULT bar2();
   };

   [
      uuid(1AECC9CC-2104-3723-98B8-7CC54722C7DD)
   ]
   dispinterface ISna {
   properties:

   methods:
      [id(1)] HRESULT sna();
   };

   [
      uuid(159A9BBB-E5F1-33F6-BEF5-6CFAD7A5933F),    version(1.0)
   ]
   coclass CBar {
      interface IBar1;
      interface IBar2;
      dispinterface ISna;
   };
}

E il file con estensione h seguente, che deve essere disponibile anche per il compilatore.

// attr_implements.h
// this ALWAYS GENERATED file contains definitions for the interfaces

/* File created by MIDL compiler version 6.00.0361 */
/* at Mon Feb 28 16:30:53 2005 */
/* Compiler settings for attr_implements.idl:
    Oicf, W1, Zp8, env=Win32 (32b run)
    protocol : dce , ms_ext, c_ext, robust
    error checks: allocation ref bounds_check enum stub_data
    VC __declspec() decoration level:
         __declspec(uuid()), __declspec(selectany), __declspec(novtable)
         DECLSPEC_UUID(), MIDL_INTERFACE()
*/
//@@MIDL_FILE_HEADING(  )

#pragma warning( disable: 4049 )  /* more than 64k source lines */

/* verify that the <rpcndr.h> version is high enough to compile this file*/
#ifndef __REQUIRED_RPCNDR_H_VERSION__
#define __REQUIRED_RPCNDR_H_VERSION__ 475
#endif

#include "rpc.h"
#include "rpcndr.h"

#ifndef __RPCNDR_H_VERSION__
#error this stub requires an updated version of <rpcndr.h>
#endif // __RPCNDR_H_VERSION__

#ifndef __attr_implements_h__
#define __attr_implements_h__

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
#pragma once
#endif

/* Forward Declarations */

#ifndef __IBar1_FWD_DEFINED__
#define __IBar1_FWD_DEFINED__
typedef interface IBar1 IBar1;
#endif /* __IBar1_FWD_DEFINED__ */

#ifndef __IBar2_FWD_DEFINED__
#define __IBar2_FWD_DEFINED__
typedef interface IBar2 IBar2;
#endif /* __IBar2_FWD_DEFINED__ */

#ifndef __ISna_FWD_DEFINED__
#define __ISna_FWD_DEFINED__
typedef interface ISna ISna;
#endif /* __ISna_FWD_DEFINED__ */

#ifndef __CBar_FWD_DEFINED__
#define __CBar_FWD_DEFINED__

#ifdef __cplusplus
typedef class CBar CBar;
#else
typedef struct CBar CBar;
#endif /* __cplusplus */

#endif /* __CBar_FWD_DEFINED__ */

/* header files for imported files */
#include "docobj.h"

#ifdef __cplusplus
extern "C"{
#endif

void * __RPC_USER MIDL_user_allocate(size_t);
void __RPC_USER MIDL_user_free( void * );

#ifndef __odod_LIBRARY_DEFINED__
#define __odod_LIBRARY_DEFINED__

/* library odod */
/* [uuid][version] */

EXTERN_C const IID LIBID_odod;

#ifndef __IBar1_INTERFACE_DEFINED__
#define __IBar1_INTERFACE_DEFINED__

/* interface IBar1 */
/* [uuid][object] */

EXTERN_C const IID IID_IBar1;

#if defined(__cplusplus) && !defined(CINTERFACE)

    MIDL_INTERFACE("1AECC9BB-2104-3723-98B8-7CC54722C7DD")
    IBar1
    {
    public:
        BEGIN_INTERFACE
        virtual /* [id] */ HRESULT STDMETHODCALLTYPE bar1( void) = 0;

        END_INTERFACE
    };

#else /* C style interface */

    typedef struct IBar1Vtbl
    {
        BEGIN_INTERFACE

        /* [id] */ HRESULT ( STDMETHODCALLTYPE *bar1 )(         IBar1 * This);

        END_INTERFACE
    } IBar1Vtbl;

    interface IBar1
    {
        CONST_VTBL struct IBar1Vtbl *lpVtbl;
    };

#ifdef COBJMACROS

#define IBar1_bar1(This)\
    (This)->lpVtbl -> bar1(This)

#endif /* COBJMACROS */

#endif /* C style interface */

/* [id] */ HRESULT STDMETHODCALLTYPE IBar1_bar1_Proxy( IBar1 * This);

void __RPC_STUB IBar1_bar1_Stub( IRpcStubBuffer *This,  IRpcChannelBuffer *_pRpcChannelBuffer,  PRPC_MESSAGE _pRpcMessage,  DWORD *_pdwStubPhase);

#endif /* __IBar1_INTERFACE_DEFINED__ */

#ifndef __IBar2_INTERFACE_DEFINED__
#define __IBar2_INTERFACE_DEFINED__

/* interface IBar2 */
/* [auto_handle][uuid][dual] */

EXTERN_C const IID IID_IBar2;

#if defined(__cplusplus) && !defined(CINTERFACE)

    MIDL_INTERFACE("1AECCABB-2104-3723-98B8-7CC54722C7DD")
    IBar2
    {
    public:
        BEGIN_INTERFACE
        virtual /* [id] */ HRESULT STDMETHODCALLTYPE bar2( void) = 0;

        END_INTERFACE
    };

#else /* C style interface */

    typedef struct IBar2Vtbl
    {
        BEGIN_INTERFACE

        /* [id] */ HRESULT ( STDMETHODCALLTYPE *bar2 )(         IBar2 * This);

        END_INTERFACE
    } IBar2Vtbl;

    interface IBar2
    {
        CONST_VTBL struct IBar2Vtbl *lpVtbl;
    };

#ifdef COBJMACROS

#define IBar2_bar2(This)\
    (This)->lpVtbl -> bar2(This)

#endif /* COBJMACROS */

#endif /* C style interface */

/* [id] */ HRESULT STDMETHODCALLTYPE IBar2_bar2_Proxy( IBar2 * This);

void __RPC_STUB IBar2_bar2_Stub( IRpcStubBuffer *This,  IRpcChannelBuffer *_pRpcChannelBuffer,  PRPC_MESSAGE _pRpcMessage,  DWORD *_pdwStubPhase);

#endif /* __IBar2_INTERFACE_DEFINED__ */

#ifndef __ISna_DISPINTERFACE_DEFINED__
#define __ISna_DISPINTERFACE_DEFINED__

/* dispinterface ISna */
/* [uuid] */

EXTERN_C const IID DIID_ISna;

#if defined(__cplusplus) && !defined(CINTERFACE)

    MIDL_INTERFACE("1AECC9CC-2104-3723-98B8-7CC54722C7DD")
    ISna : public IDispatch
    {
    };

#else /* C style interface */

    typedef struct ISnaVtbl
    {
        BEGIN_INTERFACE

        HRESULT ( STDMETHODCALLTYPE *QueryInterface )(         ISna * This,          /* [in] */ REFIID riid,          /* [iid_is][out] */ void **ppvObject);

        ULONG ( STDMETHODCALLTYPE *AddRef )(         ISna * This);

        ULONG ( STDMETHODCALLTYPE *Release )(         ISna * This);

        HRESULT ( STDMETHODCALLTYPE *GetTypeInfoCount )(         ISna * This,          /* [out] */ UINT *pctinfo);

        HRESULT ( STDMETHODCALLTYPE *GetTypeInfo )(         ISna * This,          /* [in] */ UINT iTInfo,          /* [in] */ LCID lcid,          /* [out] */ ITypeInfo **ppTInfo);

        HRESULT ( STDMETHODCALLTYPE *GetIDsOfNames )(         ISna * This,          /* [in] */ REFIID riid,          /* [size_is][in] */ LPOLESTR *rgszNames,          /* [in] */ UINT cNames,          /* [in] */ LCID lcid,          /* [size_is][out] */ DISPID *rgDispId);

        /* [local] */ HRESULT ( STDMETHODCALLTYPE *Invoke )(         ISna * This,          /* [in] */ DISPID dispIdMember,          /* [in] */ REFIID riid,          /* [in] */ LCID lcid,          /* [in] */ WORD wFlags,          /* [out][in] */ DISPPARAMS *pDispParams,          /* [out] */ VARIANT *pVarResult,          /* [out] */ EXCEPINFO *pExcepInfo,          /* [out] */ UINT *puArgErr);

        END_INTERFACE
    } ISnaVtbl;

    interface ISna
    {
        CONST_VTBL struct ISnaVtbl *lpVtbl;
    };

#ifdef COBJMACROS

#define ISna_QueryInterface(This,riid,ppvObject)\
    (This)->lpVtbl -> QueryInterface(This,riid,ppvObject)

#define ISna_AddRef(This)\
    (This)->lpVtbl -> AddRef(This)

#define ISna_Release(This)\
    (This)->lpVtbl -> Release(This)

#define ISna_GetTypeInfoCount(This,pctinfo)\
    (This)->lpVtbl -> GetTypeInfoCount(This,pctinfo)

#define ISna_GetTypeInfo(This,iTInfo,lcid,ppTInfo)\
    (This)->lpVtbl -> GetTypeInfo(This,iTInfo,lcid,ppTInfo)

#define ISna_GetIDsOfNames(This,riid,rgszNames,cNames,lcid,rgDispId)\
    (This)->lpVtbl -> GetIDsOfNames(This,riid,rgszNames,cNames,lcid,rgDispId)

#define ISna_Invoke(This,dispIdMember,riid,lcid,wFlags,pDispParams,pVarResult,pExcepInfo,puArgErr)\
    (This)->lpVtbl -> Invoke(This,dispIdMember,riid,lcid,wFlags,pDispParams,pVarResult,pExcepInfo,puArgErr)

#endif /* COBJMACROS */

#endif /* C style interface */

#endif /* __ISna_DISPINTERFACE_DEFINED__ */

EXTERN_C const CLSID CLSID_CBar;

#ifdef __cplusplus

class DECLSPEC_UUID("159A9BBB-E5F1-33F6-BEF5-6CFAD7A5933F")
CBar;
#endif
#endif /* __odod_LIBRARY_DEFINED__ */

/* Additional Prototypes for ALL interfaces */

/* end of Additional Prototypes */

#ifdef __cplusplus
}
#endif
#endif

Nel programma seguente, senza implementare, IBar1, IBar2e ISna non sarà incluso nel coclass file IDL generato.

// attr_implements.cpp
// compile with: /LD /link /idlout:out.idl
#define _ATL_ATTRIBUTES 1
#include <atlbase.h>
#include <atlcom.h>
#include "attr_implements.h"   // IDL generated header that contains a definition of the pseudo-interface IBar and pseudo-dispinterface  ISna

[module(name = "MyLib")];

[dispinterface, uuid("00000000-0000-0000-0000-000000000001")]
__interface IMyInterface
{
   [id(0)] long x;
   [id(1)] HRESULT func();
};

[
   coclass, uuid("00000000-0000-0000-0000-000000000002"), implements(interfaces={IBar1,IBar2}, dispinterfaces=ISna)
]
class CMyClass : public IMyInterface, public IBar1,    public IDispatchImpl<IBar2, &__uuidof(IBar2)>, public ISna
{
   long _x;
public:
   long get_x() { return _x; }
   void put_x(long x0) { _x = x0; }
   HRESULT func() { return S_OK; }
   HRESULT __stdcall bar1() { return S_OK; }
   HRESULT __stdcall bar2() { return S_OK; }
   HRESULT __stdcall sna() { return S_OK; }

   virtual HRESULT STDMETHODCALLTYPE ISna::Invoke(         /* [in] */ DISPID dispIdMember,          /* [in] */ REFIID riid,          /* [in] */ LCID lcid,          /* [in] */ WORD wFlags,          /* [out][in] */ DISPPARAMS *pDispParams,          /* [out] */ VARIANT *pVarResult,          /* [out] */ EXCEPINFO *pExcepInfo,          /* [out] */ UINT *puArgErr)
   {
      HRESULT hr = S_OK;
      if (pDispParams == 0) {
         return DISP_E_BADVARTYPE;
      }
      if (pDispParams->cArgs> 0) {
         return DISP_E_BADPARAMCOUNT;
      }
      if (pVarResult != 0) {
         ::VariantInit(pVarResult);
      }
      switch (dispIdMember) {
      case 1:
         {
            if (pDispParams->cArgs != 0) {
               return DISP_E_BADPARAMCOUNT;
            }
            hr = this->sna();
            break;
         }
      default:
         return DISP_E_MEMBERNOTFOUND;
      }
      return hr;
   }
   virtual HRESULT STDMETHODCALLTYPE ISna::GetIDsOfNames(         /* [in] */ REFIID riid,          /* [size_is][in] */ LPOLESTR *rgszNames,          /* [in] */ UINT cNames,          /* [in] */ LCID lcid,          /* [size_is][out] */ DISPID *rgDispId)
   {
      static LPOLESTR names[] = { L"sna" };
      static DISPID dids[] = { 1 };
      for (unsigned int i = 0; i < cNames; ++i) {
         int fFoundIt = 0;
         for (unsigned int j = 0; j < sizeof(names)/sizeof(LPOLESTR); ++j) {
            if (lstrcmpiW(rgszNames[i], names[j]) == 0) {
               fFoundIt = 1;
               rgDispId[i] = dids[j];
               break;
            }
         }
         if (fFoundIt == 0) {
            return DISP_E_UNKNOWNNAME;
         }
      }
      return S_OK;
   }
   virtual HRESULT STDMETHODCALLTYPE ISna::GetTypeInfoCount(unsigned int*  pctinfo)
   {
      if (pctinfo == NULL) {
         return E_POINTER;
      }
      CComPtr<ITypeInfo> spTypeInfo;
      *pctinfo =
                  (SUCCEEDED(TypeInfoHelper(__uuidof(ISna), 0, &spTypeInfo))) ? 1 : 0;
      return S_OK;
   }
   virtual HRESULT STDMETHODCALLTYPE ISna::GetTypeInfo(unsigned int iTInfo, LCID lcid, ITypeInfo** ppTInfo)
   {
      if (iTInfo != 0) {
         return DISP_E_BADINDEX;
      }
      return TypeInfoHelper(__uuidof(ISna), lcid, ppTInfo);
   }
   BEGIN_COM_MAP(CMyClass)
      COM_INTERFACE_ENTRY(IBar1)
      COM_INTERFACE_ENTRY(IBar2)
      COM_INTERFACE_ENTRY(ISna)
   END_COM_MAP()
};

Vedi anche

Attributi del compilatore
Attributi di classe