C++ ChkComOutPtr函数代码示例

/*----------------------------------------------------------------------------------------------
	Return a list of recognized values for the given feature. If cfvalMax is zero,
	pcfval returns the total number of values. Otherwise, it returns the number entered into
	the array.
----------------------------------------------------------------------------------------------*/
STDMETHODIMP FwGrEngine::GetFeatureValues(int fid, int cfvalMax,
	int * prgfval, int * pcfval, int * pfvalDefault)
{
	BEGIN_COM_METHOD;
	ChkComOutPtr(pcfval);
	ChkComOutPtr(pfvalDefault);
	ChkComArrayArg(prgfval, cfvalMax);

	if (!m_pfont)
	{
		Assert(false);
		return E_UNEXPECTED;
	}

	FeatureIterator fit = m_pfont->featureWithID(fid);
	std::pair<FeatureSettingIterator, FeatureSettingIterator> pairIt
		= m_pfont->getFeatureSettings(fit);

	FeatureSettingIterator fsit = pairIt.first;
	FeatureSettingIterator fsitEnd = pairIt.second;
	int cfval = fsitEnd - fsit;
	if (cfvalMax == 0)
	{
		*pcfval = cfval;
		return S_OK;
	}

	*pcfval = min(cfvalMax, cfval);
	for (int i = 0;
		fsit != pairIt.second;
		++fsit, i++)
	{
		if (i >= *pcfval)
			break;
		prgfval[i] = (*fsit);
	}

	FeatureSettingIterator fsitDefault = m_pfont->getDefaultFeatureValue(fit);
	*pfvalDefault = *fsitDefault;
	for (int ifeat = 0; ifeat < m_cfeatWDefaults; ifeat++)
	{
		if (m_rgfsetDefaults[ifeat].id == fid)
		{
			*pfvalDefault = m_rgfsetDefaults[ifeat].value;
			break;
		}
	}

	END_COM_METHOD(g_fact, IID_IRenderingFeatures);
}

/*----------------------------------------------------------------------------------------------
	Return the support script directions. For the Roman renderer, this is simply horizontal
	left-to-right.
----------------------------------------------------------------------------------------------*/
STDMETHODIMP RomRenderEngine::get_ScriptDirection(int * pgrfsdc)
{
	BEGIN_COM_METHOD
	ChkComOutPtr(pgrfsdc);
	*pgrfsdc = kfsdcHorizLtr;
	END_COM_METHOD(g_fact, IID_IRenderEngine);
}

/*----------------------------------------------------------------------------------------------
	Do a direct string comparison.
	Note that, contrary to what the contract implies, this routine is not more
	efficient than the client just retrieving the keys and comparing them.
	OPTIMIZE: would we benefit significantly by implementing this using CompareString?
	Unfortunately, it is hard to avoid the need to do the WideCharToMultiByte conversion
	for the whole of both strings...
----------------------------------------------------------------------------------------------*/
STDMETHODIMP LgIcuCollator::Compare(BSTR bstrValue1, BSTR bstrValue2,
	LgCollatingOptions colopt, int * pnVal)
{
	BEGIN_COM_METHOD
	ChkComBstrArgN(bstrValue1);
	ChkComBstrArgN(bstrValue2);
	ChkComOutPtr(pnVal);

	EnsureCollator();

	int32_t cbKey1 = keySize;
	byte rgbKey1[keySize+1];
	Vector<byte> vbKey1;
	byte * pbKey1 = GetSortKey(bstrValue1, rgbKey1, &cbKey1, vbKey1);

	int32_t cbKey2 = keySize;
	byte rgbKey2[keySize+1];
	Vector<byte> vbKey2;
	byte * pbKey2 = GetSortKey(bstrValue2, rgbKey2, &cbKey2, vbKey2);

	*pnVal = strcmp((char *)pbKey1, (char *)pbKey2);

	return S_OK;

	END_COM_METHOD(g_fact, IID_ILgCollatingEngine);
}

/*----------------------------------------------------------------------------------------------
	Generate the sort key as a BSTR
----------------------------------------------------------------------------------------------*/
STDMETHODIMP LgUnicodeCollater::get_SortKey(BSTR bstrValue, LgCollatingOptions colopt,
	BSTR * pbstrKey)
{
	BEGIN_COM_METHOD
	ChkComBstrArg(bstrValue);
	ChkComOutPtr(pbstrKey);

	HRESULT hr;
	int cchw;
	*pbstrKey = NULL;
	// Passing 0 and null just produces a length
	IgnoreHr(hr = SortKeyRgch(bstrValue, BstrLen(bstrValue), colopt, 0, NULL, &cchw));
	if (FAILED(hr))
		return hr;

	BSTR bstrOut;
	bstrOut = SysAllocStringLen(NULL, cchw);
	if (!bstrOut)
		return E_OUTOFMEMORY;
	IgnoreHr(hr = SortKeyRgch(bstrValue, BstrLen(bstrValue), colopt, cchw, bstrOut, &cchw));
	if (FAILED(hr))
	{
		SysFreeString(bstrOut);
		return hr;
	}
	*pbstrKey = bstrOut;
	END_COM_METHOD(g_fact, IID_ILgCollatingEngine);
}

/*----------------------------------------------------------------------------------------------
	Create a property with the given writing system, old writing system, and named style (ktptNamedStyle).
	Note that ktptCharStyle (which this used to use) is effectively obsolete.
----------------------------------------------------------------------------------------------*/
STDMETHODIMP TsPropsFact::MakePropsRgch(const OLECHAR * prgch, int cch,	int ws, int ows,
	ITsTextProps ** ppttp)
{
	BEGIN_COM_METHOD;
	ChkComArrayArg(prgch, cch);
	ChkComOutPtr(ppttp);
	if ((uint)ws > kwsLim)
		ThrowInternalError(E_INVALIDARG, "Magic writing system invalid in string");

	TsIntProp tip;
	TsStrProp tsp;
	int ctip = 0;
	int ctsp = 0;

	tip.m_nVal = ws;
	tip.m_nVar = ows;
	tip.m_tpt = ktptWs;
	ctip = 1;
	if (cch)
	{
		StrUni stu(prgch, cch);
		TsStrHolder * ptsh = TsStrHolder::GetStrHolder();
		tsp.m_hstuVal = ptsh->GetCookieFromString(stu);
		tsp.m_tpt = ktptNamedStyle;
		ctsp = 1;
	}
	TsTextProps::Create(ctip ? &tip : NULL, ctip, ctsp ? &tsp : NULL, ctsp, ppttp);

	END_COM_METHOD(g_factPropsFact, IID_ITsPropsFactory);
}

/*----------------------------------------------------------------------------------------------
	Return the number of outstanding Redoable sequences. This is the number of
	times the user could issue the Redo command.
----------------------------------------------------------------------------------------------*/
STDMETHODIMP ActionHandler::get_RedoableSequenceCount(int * pcAct)
{
	BEGIN_COM_METHOD;
	ChkComOutPtr(pcAct);
	*pcAct = m_viSeqStart.Size() - m_iCurrSeq - 1;
	END_COM_METHOD(g_factActh, IID_IActionHandler);
}

/*----------------------------------------------------------------------------------------------
	Return the writing system factory for this database (or the registry, as the case may be).

	@param ppwsf Address of the pointer for returning the writing system factory.
----------------------------------------------------------------------------------------------*/
STDMETHODIMP FwGrEngine::get_WritingSystemFactory(ILgWritingSystemFactory ** ppwsf)
{
	BEGIN_COM_METHOD
	ChkComOutPtr(ppwsf);
	*ppwsf = m_qwsf;
	(*ppwsf)->AddRef();
	END_COM_METHOD(g_fact, IID_IRenderEngine)
}

/*----------------------------------------------------------------------------------------------
	Read an array of ITsTextProps from a byte array and return it. If cpttpMax == 0, return
	in cpttpRet the number of items present. Return S_FALSE if the array is not totally
	consumed, but at least one ITsTextProps is successfully read.

	For runs that have duplicate properties (ie, where the offsets into the properties stuff
	are identical), returns duplicate pointers in rgpttp.

	Also return the character counts for each run, so that we can reconstruct the
	run information later on.
----------------------------------------------------------------------------------------------*/
STDMETHODIMP TsPropsFact::DeserializeRgPropsRgb(int cpttpMax, const BYTE * prgb, int * pcb,
		int * pcpttpRet, ITsTextProps ** rgpttp, int * rgich)
{
	BEGIN_COM_METHOD;
	ChkComArgPtr(pcb);
	ChkComOutPtr(pcpttpRet);
	ChkComArrayArg(prgb, *pcb);
	ChkComArrayArg(rgpttp, cpttpMax);
	ChkComArrayArg(rgich, cpttpMax);

	DataReaderRgb drrHdr(prgb, *pcb);
	int crun;
	drrHdr.ReadInt(&crun);
	if (cpttpMax == 0)
	{
		*pcpttpRet = crun;
	}
	else
	{
		Vector<int> vcbOffsets;
		vcbOffsets.Resize(crun);

		const byte * pbRun0 = prgb + isizeof(int) + (crun * isizeof(int) * 2);

		for (int irun = 0; irun < min(cpttpMax, crun); irun++)
		{
			drrHdr.ReadInt(rgich + irun); // character min
			int cbOffsetThisRun;
			drrHdr.ReadInt(&cbOffsetThisRun);
			vcbOffsets[irun] = cbOffsetThisRun;

			// Check for a duplicate set of properties.
			int irunDup;
			for (irunDup = 0; irunDup < irun; irunDup++)
			{
				if (cbOffsetThisRun == vcbOffsets[irunDup])
				{
					// Duplicate offset: copy the previous ITsTextProps.
					rgpttp[irun] = rgpttp[irunDup];
					rgpttp[irun]->AddRef();
					break;
				}
			}
			if (irunDup >= irun) // didn't find duplicate
			{
				const byte * pbThisRun = pbRun0 + cbOffsetThisRun;
				// Note that the buffer size is provided below simply as a sanity check. The
				// data itself is structured so that the deserialize method knows how much
				// to read for each run.
				DataReaderRgb drr(pbThisRun, (*pcb - (pbThisRun - prgb)));
				TsTextProps::DeserializeDataReader(&drr, rgpttp + irun);
			}
		}
		*pcpttpRet = min(cpttpMax, crun);
	}

	END_COM_METHOD(g_factPropsFact, IID_ITsPropsFactory);
}