Enumerating Objects in a Collection
The following code enumerates the protocols in the IAS protocols collection.
HRESULT hr;
//
// Retrieve the protocols collection object
//
_variant_t vtIASProtocolsCollection;
hr = pSdo->GetProperty(
PROPERTY_IAS_PROTOCOLS_COLLECTION,
&vtIASProtocolsCollection
);
if (FAILED(hr))
{
return hr;
}
//
// Retrieve the ISdoCollection interface
// for the object.
//
CComPtr<ISdoCollection> pIASProtocolsCollection;
hr = vtIASProtocolsCollection.pdispVal->QueryInterface(
__uuidof(ISdoCollection),
(void **) &pIASProtocolsCollection
);
if (FAILED(hr))
{
return hr;
}
//
// Retrieve the enumeration interface, IEnumVARIANT
//
CComPtr<IUnknown> pUnknownProtocol;
hr = pIASProtocolsCollection->get__NewEnum(&pUnknownProtocol);
if (FAILED(hr))
{
return hr;
}
CComPtr<IEnumVARIANT> pEnumProtocols;
hr = pUnknownProtocol->QueryInterface(
__uuidof(IEnumVARIANT),
(void **) &pEnumProtocols
);
if (FAILED(hr))
{
return hr;
}
//
// Retrieve the first protocol from the collection
//
DWORD dwRetrieved = 1;
_variant_t vtProtocol;
hr = pEnumProtocols->Next(1, &vtProtocol, &dwRetrieved);
if (FAILED(hr))
{
return hr;
}
while (hr != S_FALSE) {
//
// Retrieve the name of the protocol
//
CComPtr<ISdo> pLocalSdo;
hr = vtProtocol.pdispVal->QueryInterface(
__uuidof(ISdo),
(void**)&pLocalSdo
);
if (FAILED(hr))
{
return hr;
}
_variant_t vtName;
hr = pLocalSdo->GetProperty(PROPERTY_SDO_NAME, &vtName);
if (FAILED(hr))
{
return hr;
}
vtProtocol.Clear();
vtName.Clear();
//
// Retrieve the next protocol from the collection
//
dwRetrieved = 1;
hr = pEnumProtocols->Next(1, &vtProtocol, &dwRetrieved);
if (FAILED(hr))
{
return hr;
}
}
Remarks
The vtName and vtProtocol variables are of type _variant_t. A _variant_t object encapsulates, or encloses, the VARIANT data type. The class manages resource allocation and deallocation, and makes function calls to VariantInit and VariantClear as appropriate.
See Also
_variant_t
Adding a Client
IASCOMMONPROPERTIES
IEnumVARIANT
ISdo::GetProperty
Retrieving a Service SDO
VariantClear
VariantInit
VARIANT
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Build date: 10/15/2007