Esempi in C++ (Cpp) per ICommandProperties::GetProperties

Esempio n. 1

File: datasource.cpp Progetto: Essjay1/Windows-classic-samples

/////////////////////////////////////////////////////////////////
// myGetProperty
//
//	This function gets the BOOL value for the specified property
//	and returns the result in *pbValue.
//
/////////////////////////////////////////////////////////////////
HRESULT myGetProperty
	(
	IUnknown *				pIUnknown, 
	REFIID					riid, 
	DBPROPID				dwPropertyID, 
	REFGUID					guidPropertySet, 
	BOOL *					pbValue
	)
{
	HRESULT					hr;
	DBPROPID				rgPropertyIDs[1];
	DBPROPIDSET				rgPropertyIDSets[1];
	
	ULONG					cPropSets					= 0;
	DBPROPSET *				rgPropSets					= NULL;

	IDBProperties *			pIDBProperties				= NULL;
	ISessionProperties *	pISesProps					= NULL;
	ICommandProperties *	pICmdProps					= NULL;
	IRowsetInfo *			pIRowsetInfo				= NULL;

	// Initialize the output value
	*pbValue = FALSE;

	// Set up the property ID array
	rgPropertyIDs[0] = dwPropertyID;
	
	// Set up the Property ID Set
	rgPropertyIDSets[0].rgPropertyIDs	= rgPropertyIDs;
	rgPropertyIDSets[0].cPropertyIDs	= 1;
	rgPropertyIDSets[0].guidPropertySet	= guidPropertySet;

	// Get the property value for this property from the provider, but
	// don't try to display extended error information, since this may
	// not be a supported property: a failure is, in fact, expected if
	// the property is not supported
	if( riid == IID_IDBProperties )
	{
		XCHECK_HR(hr = pIUnknown->QueryInterface(IID_IDBProperties, 
					(void**)&pIDBProperties));
		CHECK_HR(hr = pIDBProperties->GetProperties(
					1,					//cPropertyIDSets
					rgPropertyIDSets,	//rgPropertyIDSets
					&cPropSets,			//pcPropSets
					&rgPropSets			//prgPropSets
					));
	}
	else if( riid == IID_ISessionProperties )
	{
		XCHECK_HR(hr = pIUnknown->QueryInterface(IID_ISessionProperties, 
					(void**)&pISesProps));
		CHECK_HR(hr = pISesProps->GetProperties(
					1,					//cPropertyIDSets
					rgPropertyIDSets,	//rgPropertyIDSets
					&cPropSets,			//pcPropSets
					&rgPropSets			//prgPropSets
					));
	}
	else if( riid == IID_ICommandProperties )
	{
		XCHECK_HR(hr = pIUnknown->QueryInterface(IID_ICommandProperties, 
					(void**)&pICmdProps));
		CHECK_HR(hr = pICmdProps->GetProperties(
					1,					//cPropertyIDSets
					rgPropertyIDSets,	//rgPropertyIDSets
					&cPropSets,			//pcPropSets
					&rgPropSets			//prgPropSets
					));
	}
	else
	{
		XCHECK_HR(hr = pIUnknown->QueryInterface(IID_IRowsetInfo, 
					(void**)&pIRowsetInfo));
		CHECK_HR(hr = pIRowsetInfo->GetProperties(
					1,					//cPropertyIDSets
					rgPropertyIDSets,	//rgPropertyIDSets
					&cPropSets,			//pcPropSets
					&rgPropSets			//prgPropSets
					));
	}

	// Return the value for this property to the caller if
	// it's a VT_BOOL type value, as expected
	if( V_VT(&rgPropSets[0].rgProperties[0].vValue) == VT_BOOL )
		*pbValue = V_BOOL(&rgPropSets[0].rgProperties[0].vValue);

CLEANUP:
	if( rgPropSets )
	{
		CoTaskMemFree(rgPropSets[0].rgProperties);
		CoTaskMemFree(rgPropSets);
	}
	if( pIDBProperties )
		pIDBProperties->Release();
	if( pISesProps )
		pISesProps->Release();
	if( pICmdProps )
		pICmdProps->Release();
	if( pIRowsetInfo )
		pIRowsetInfo->Release();
	return hr;
}