beeper.cpp

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 *  pExcepInfo      EXCEPINFO * to exception information.
 *  puArgErr        UINT * in which to store the index of an
 *                  invalid parameter if DISP_E_TYPEMISMATCH
 *                  is returned.
 *
 * Return Value:
 *  HRESULT         NOERROR or a general error code.
 */

STDMETHODIMP CBeeper::Invoke(DISPID dispID, REFIID riid
    , LCID lcid, unsigned short wFlags, DISPPARAMS *pDispParams
    , VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
    {
    HRESULT     hr;
    ITypeInfo  *pTI;
    LANGID      langID=PRIMARYLANGID(lcid);

    //riid is supposed to be IID_NULL always
    if (IID_NULL!=riid)
        return ResultFromScode(DISP_E_UNKNOWNINTERFACE);

    //Get the ITypeInfo for lcid
    hr=GetTypeInfo(0, lcid, &pTI);

    if (FAILED(hr))
        return hr;

   #ifdef WIN32
    //This saves the language ID for this thread
    TlsSetValue(g_dwTLS, &langID);
   #endif

    //Clear exceptions
    SetErrorInfo(0L, NULL);

    //This is exactly what DispInvoke does--so skip the overhead.
    hr=pTI->Invoke((IBeeper *)this, dispID, wFlags
        , pDispParams, pVarResult, pExcepInfo, puArgErr);

    //Exception handling is done within ITypeInfo::Invoke

    pTI->Release();
    return hr;
    }








//IBeeper interface functions

/*
 * CBeeper::get_Sound
 * CBeeper::put_Sound
 *
 * Purpose:
 *  Functions called from DispInvoke to handle the Sound property.
 *
 * Parameters (Set only):
 *  lSound          long, new sound to save after validation
 *
 * Out Parameters: (Get only):
 *  plSound         long *, the current sound.
 */

STDMETHODIMP CBeeper::get_Sound(long *plSound)
    {
    if (NULL==plSound)
        return ResultFromScode(E_POINTER);

    *plSound=m_lSound;
    return NOERROR;
    }


STDMETHODIMP CBeeper::put_Sound(long lSound)
    {
    if (MB_OK!=lSound && MB_ICONEXCLAMATION!=lSound
        && MB_ICONQUESTION!=lSound && MB_ICONHAND!=lSound
        && MB_ICONASTERISK!=lSound)
        {
        /*
         * Since we cannot return a value to ITypeInfo::Invoke to
         * indicate an exception condition, we'll use our Exception
         * function to raise them through the error info mechanism.
         */
        Exception(EXCEPTION_INVALIDSOUND);
        return ResultFromScode(DISP_E_EXCEPTION);
        }

    m_lSound=lSound;
    return NOERROR;
    }


/*
 * CBeeper::Beep
 *
 * Purpose:
 *  Function called from DispInvoke to invoke the Beep method.
 *
 * Out Parameter:
 *  plSoundPlayed   long *, the sound played.
 */

STDMETHODIMP CBeeper::Beep(long *plSoundPlayed)
    {
    if (NULL==plSoundPlayed)
        return ResultFromScode(E_POINTER);

    *plSoundPlayed=m_lSound;
    MessageBeep((UINT)m_lSound);
    return NOERROR;
    }



/*
 * CBeeper::Exception
 *
 * Purpose:
 *  Raises an exception for Invoke from within ITypeInfo::Invoke
 *  using the CreateErrorInfo API and the ICreateErrorInfo interface.
 *  This is part of CBeeper since CBeeper derives from IDispatch
 *  as well.
 *
 * Parameters:
 *  wException      WORD exception code.
 */

void CBeeper::Exception(WORD wException)
    {
    HRESULT             hr;
    ICreateErrorInfo   *pICreateErr;
    BOOL                fSuccess;
    LPTSTR              psz;
    LPOLESTR            pszHelp;
    UINT                idsSource;
    UINT                idsException;
    DWORD               dwHelpID;
    LANGID              langID=LANG_NEUTRAL;
   #ifdef WIN32
    LANGID             *pLangID;
   #endif

   #ifdef WIN32
    pLangID=(LANGID *)TlsGetValue(g_dwTLS);

    if (NULL!=pLangID)
        langID=*pLangID;
   #endif

    /*
     * Thread-safe exception handling means that we call
     * CreateErrorInfo which gives us an ICreateErrorInfo pointer
     * that we then use to set the error information (basically
     * to set the fields of an EXCEPINFO structure.  We then
     * call SetErrorInfo to attach this error to the current
     * thread.  ITypeInfo::Invoke will look for this when it
     * returns from whatever function was invokes by calling
     * GetErrorInfo.
     */

    //Not much we can do if this fails.
    if (FAILED(CreateErrorInfo(&pICreateErr)))
        return;

    psz=(LPTSTR)malloc(1024*sizeof(TCHAR));

    if (NULL==psz)
        {
        pICreateErr->Release();
        return;
        }

    fSuccess=FALSE;

    switch (wException)
        {
        case EXCEPTION_INVALIDSOUND:
            pICreateErr->SetGUID(IID_IBeeper);

            dwHelpID=HID_SOUND_PROPERTY_LIMITATIONS;

            pszHelp=OLETEXT("beep0000.hlp");
            idsSource=IDS_0_EXCEPTIONSOURCE;
            idsException=IDS_0_EXCEPTIONINVALIDSOUND;

            switch (langID)
                {
                case LANG_GERMAN:
                    idsSource=IDS_7_EXCEPTIONSOURCE;
                    idsException=IDS_7_EXCEPTIONINVALIDSOUND;
                    pszHelp=OLETEXT("beep0007.hlp");
                    break;

                case LANG_ENGLISH:
                case LANG_NEUTRAL:
                default:
                    break;
                }

            fSuccess=TRUE;
            break;

        default:
            break;
        }


    if (fSuccess)
        {
        IErrorInfo *pIErr;

        /*
         * If you have a help file, call the functions
         * ICreateErrorInfo::SetHelpFile and
         * ICreateErrorInfo::SetHelpContext as well.  If you
         * set the help file to NULL the context is ignored.
         */
        pICreateErr->SetHelpFile(pszHelp);
        pICreateErr->SetHelpContext(dwHelpID);

       #ifdef WIN32ANSI
        OLECHAR     szTemp[256];

        LoadString(g_hInst, idsSource, psz, 256);
        MultiByteToWideChar(CP_ACP, 0, psz, -1, szTemp, 256);
        pICreateErr->SetSource(szTemp);

        LoadString(g_hInst, idsException, psz, 256);
        MultiByteToWideChar(CP_ACP, 0, psz, -1, szTemp, 256);
        pICreateErr->SetDescription(szTemp);
       #else
        LoadString(g_hInst, idsSource, psz, 1024);
        pICreateErr->SetSource(psz);

        LoadString(g_hInst, idsException, psz, 1024);
        pICreateErr->SetDescription(psz);
       #endif

        hr=pICreateErr->QueryInterface(IID_IErrorInfo
            , (PPVOID)&pIErr);

        if (SUCCEEDED(hr))
            {
            SetErrorInfo(0L, pIErr);
            pIErr->Release();
            }
        }

    free(psz);

    //SetErrorInfo holds the object's IErrorInfo
    pICreateErr->Release();
    return;
    }






//ISupportErrorInfo interface implementation

/*
 * CImpISupportErrorInfo::CImpISupportErrorInfo
 * CImpISupportErrorInfo::~CImpISupportErrorInfo
 *
 * Parameters (Constructor):
 *  pObj            PCBeeper of the object we're in.
 *  pUnkOuter       LPUNKNOWN to which we delegate.
 */

CImpISupportErrorInfo::CImpISupportErrorInfo(PCBeeper pObj
    , LPUNKNOWN pUnkOuter)
    {
    m_cRef=0;
    m_pObj=pObj;
    m_pUnkOuter=pUnkOuter;
    return;
    }

CImpISupportErrorInfo::~CImpISupportErrorInfo(void)
    {
    return;
    }



/*
 * CImpISupportErrorInfo::QueryInterface
 * CImpISupportErrorInfo::AddRef
 * CImpISupportErrorInfo::Release
 *
 * Purpose:
 *  IUnknown members for CImpISupportErrorInfo object.
 */

STDMETHODIMP CImpISupportErrorInfo::QueryInterface(REFIID riid
    , PPVOID ppv)
    {
    return m_pUnkOuter->QueryInterface(riid, ppv);
    }


STDMETHODIMP_(ULONG) CImpISupportErrorInfo::AddRef(void)
    {
    ++m_cRef;
    return m_pUnkOuter->AddRef();
    }

STDMETHODIMP_(ULONG) CImpISupportErrorInfo::Release(void)
    {
    --m_cRef;
    return m_pUnkOuter->Release();
    }



/*
 * CImpISupportErrorInfo::InterfaceSupportsErrorInfo
 *
 * Purpose:
 *  Informs a caller whether or not a specific interface
 *  supports exceptions through the Set/GetErrorInfo mechanism.
 *
 * Parameters:
 *  riid            REFIID of the interface in question.
 *
 * Return Value:
 *  HRESULT         NOERROR if a call to GetErrorInfo will succeed
 *                  for callers of riid.  S_FALSE if not.
 */

STDMETHODIMP CImpISupportErrorInfo::InterfaceSupportsErrorInfo
    (REFIID riid)
    {
    if (IID_IBeeper==riid)
        return NOERROR;

    return ResultFromScode(S_FALSE);
    }