When you instantiate one of these iterators, you have the option of specifying a property set and a property query. This means that you can specify a set of characteristics you want to retrieve, and use the iterator to query for the file system entities with matching properties.
NOTE 
To learn more about property sets and queries, read Chapter 5
Each iterator provides First and Next member functions, both of which optionally accept a property set as a parameter. Use the First function to get the first entity, and the Next function to retrieve consecutive entities. The First function must be executed before any Next functions.
All iterator member functions return kEndOfIteration when there are no more entities through which to iterate.
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