IEnumIDList 

The IEnumIDList interface enumerates item identifiers associated with shell folder objects. First, use IShellFolder::EnumObjects9S6N0N to create an item enumeration object and then use IEnumIDList to iterate through the item IDs in the enumeration object.

IEnumIDList has the same methods as all enumerator interfaces: Next, Skip, Reset, and Clone. Next iterates through the item IDs one or more at a time, Skip passes over the next item ID in the list, Reset returns to the beginning of the item ID list, and Clone returns a duplicate item enumeration object.

When to Implement

You can implement this interface when you want a caller to be able to enumerate the item IDs contained in a folder object. You get a pointer to IEnumIDList through IShellFolder::EnumObjects.

When to Use

You don t use this interface directly. IShellFolder::EnumObjects creates an enumeration object of this kind. In this case, the enumeration is a set of item identifiers. The shell calls then IEnumIDList  methods to enumerate the items contained in a enumeration object.

Methods in Vtable Order