IVdsHwProvider::QuerySubSystems method (vdshwprv.h)
Returns an enumeration of the subsystems managed by the provider.
HRESULT QuerySubSystems( IEnumVdsObject **ppEnum );
The address of an IEnumVdsObject interface pointer that can be used to enumerate the subsystems as subsystem objects. For more information, see Working with Enumeration Objects. Callers must release the interface and each of the subsystem objects when they are no longer needed by calling the IUnknown::Release method.
This method can return standard HRESULT values, such as E_INVALIDARG or E_OUTOFMEMORY, and VDS-specific return values. It can also return converted system error codes using the HRESULT_FROM_WIN32 macro. Errors can originate from VDS itself or from the underlying VDS provider that is being used. Possible return values include the following.
||Returns the enumeration of subsystem identifiers. If the provider manages no subsystems, the enumeration is empty.|
||This return value signals a software or communication problem inside a provider that caches information about the array. Use the IVdsHwProvider::Reenumerate method followed by the IVdsHwProvider::Refresh method to restore the cache.|
||The provider is in a failed state, and is unable to perform the requested operation.|
||Another operation is in progress; this operation cannot proceed until the previous operation or operations are complete.|
||The initialization method has not been called.|
The returned object enumerates all subsystems currently connected to the network. Use the IVdsHwProvider::Reenumerate method to discover new subsystems. Use the IVdsHwProvider::Refreshmethod to refresh the internally-cached provider data for existing subsystems.
|Minimum supported client||Windows Vista [desktop apps only]|
|Minimum supported server||Windows Server 2003 [desktop apps only]|