The IKsPropertySet::Get method retrieves data for an item in a property set.
HRESULT Get(
  REFGUID rguidPropSet,
  ULONG ulId, 
  LPVOID pInstanceData, 
  ULONG ulInstanceLength, 
  LPVOID pPropertyData, 
  ULONG ulDataLength,
  ULONG * pulBytesReturned
);
 Return values are determined by the designer of the property set.
If the method succeeds, the return value may be S_OK.
If it fails, the method may return E_POINTER.
The format of the data in both pInstanceData and pPropertyData is item-specific.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dsound.h.