typedef struct ISpVoice ISpVoice;
     typedef struct ISpVoiceVtbl
     {

         HRESULT (__stdcall * QueryInterface) (ISpVoice * This, const IID * const riid, void **ppvObject);

         ULONG (__stdcall * AddRef) (ISpVoice * This);

         ULONG (__stdcall * Release) (ISpVoice * This);

         HRESULT (__stdcall * SetNotifySink) (ISpVoice * This, ISpNotifySink * pNotifySink);

         HRESULT (__stdcall * SetNotifyWindowMessage) (ISpVoice * This, HWND hWnd, UINT Msg, WPARAM wParam,
                                                       LPARAM lParam);

         HRESULT (__stdcall * SetNotifyCallbackFunction) (ISpVoice * This, SPNOTIFYCALLBACK * pfnCallback,
                                                          WPARAM wParam, LPARAM lParam);

         HRESULT (__stdcall * SetNotifyCallbackInterface) (ISpVoice * This, ISpNotifyCallback * pSpCallback,
                                                           WPARAM wParam, LPARAM lParam);

         HRESULT (__stdcall * SetNotifyWin32Event) (ISpVoice * This);

         HRESULT (__stdcall * WaitForNotifyEvent) (ISpVoice * This, DWORD dwMilliseconds);

         HANDLE (__stdcall * GetNotifyEventHandle) (ISpVoice * This);

         10HRESULT (__stdcall * SetInterest) (ISpVoice * This, ULONGLONG ullEventInterest,
                                            ULONGLONG ullQueuedInterest);

         HRESULT (__stdcall * GetEvents) (ISpVoice * This, ULONG ulCount, SPEVENT * pEventArray,
                                          ULONG * pulFetched);

         HRESULT (__stdcall * GetInfo) (ISpVoice * This, SPEVENTSOURCEINFO * pInfo);

         HRESULT (__stdcall * SetOutput) (ISpVoice * This, IUnknown * pUnkOutput, BOOL fAllowFormatChanges);

         HRESULT (__stdcall * GetOutputObjectToken) (ISpVoice * This, ISpObjectToken ** ppObjectToken);

         HRESULT (__stdcall * GetOutputStream) (ISpVoice * This, ISpStreamFormat ** ppStream);

         HRESULT (__stdcall * Pause) (ISpVoice * This);

         HRESULT (__stdcall * Resume) (ISpVoice * This);

         18HRESULT (__stdcall * SetVoice) (ISpVoice * This, ISpObjectToken * pToken);

         HRESULT (__stdcall * GetVoice) (ISpVoice * This, ISpObjectToken ** ppToken);

         HRESULT (__stdcall * Speak) (ISpVoice * This, const WCHAR * pwcs, DWORD dwFlags,
                                      ULONG * pulStreamNumber);

         HRESULT (__stdcall * SpeakStream) (ISpVoice * This, IStream * pStream, DWORD dwFlags,
                                            ULONG * pulStreamNumber);

         HRESULT (__stdcall * GetStatus) (ISpVoice * This, SPVOICESTATUS * pStatus,
                                          WCHAR ** ppszLastBookmark);

         HRESULT (__stdcall * Skip) (ISpVoice * This, WCHAR * pItemType, long lNumItems,
                                     ULONG * pulNumSkipped);

         HRESULT (__stdcall * SetPriority) (ISpVoice * This, SPVPRIORITY ePriority);

         HRESULT (__stdcall * GetPriority) (ISpVoice * This, SPVPRIORITY * pePriority);

         HRESULT (__stdcall * SetAlertBoundary) (ISpVoice * This, SPEVENTENUM eBoundary);

         HRESULT (__stdcall * GetAlertBoundary) (ISpVoice * This, SPEVENTENUM * peBoundary);

         HRESULT (__stdcall * SetRate) (ISpVoice * This, long RateAdjust);

         HRESULT (__stdcall * GetRate) (ISpVoice * This, long *pRateAdjust);

         HRESULT (__stdcall * SetVolume) (ISpVoice * This, USHORT usVolume);

         HRESULT (__stdcall * GetVolume) (ISpVoice * This, USHORT * pusVolume);

         HRESULT (__stdcall * WaitUntilDone) (ISpVoice * This, ULONG msTimeout);

         HRESULT (__stdcall * SetSyncSpeakTimeout) (ISpVoice * This, ULONG msTimeout);

         HRESULT (__stdcall * GetSyncSpeakTimeout) (ISpVoice * This, ULONG * pmsTimeout);

         HANDLE (__stdcall * SpeakCompleteEvent) (ISpVoice * This);

         HRESULT (__stdcall * IsUISupported) (ISpVoice * This, const WCHAR * pszTypeOfUI, void *pvExtraData,
                                              ULONG cbExtraData, BOOL * pfSupported);

         HRESULT (__stdcall * DisplayUI) (ISpVoice * This, HWND hwndParent, const WCHAR * pszTitle,
                                          const WCHAR * pszTypeOfUI, void *pvExtraData, ULONG cbExtraData);

     } ISpVoiceVtbl;

     struct ISpVoice
     {
         struct ISpVoiceVtbl *lpVtbl;
     };