The ICatInformation interface provides methods for obtaining information about the categories implemented or required by a certain class, as well as information about the categories registered on a given machine.
When to Implement
There is no need to implement this interface. The Component Category Manager, a system-provided COM object that can be instantiated by using CoCreateInstance, implements ICatInformation.
When to Use
Call the methods of ICatInformation to obtain a listing of available categories, enumerate classes that belong to a particular category, and determine if a class belongs to a specific category.
Methods in Vtable Order
IUnknown Methods Description
QueryInterface
Returns pointers to supported interfaces.
AddRef Increments reference count.
Release Decrements reference count.
ICatInformation Methods Description
EnumCategories
Returns an enumerator for the component
categories registered on the system.
GetCategoryDesc Retrieves the localized description string for
a specific category ID.
EnumClassesOfCategories Returns an enumerator over the classes that
implement/require a certain set of categories.
IsClassOfCategories Determines if a class implements/requires the
specified categories.
EnumImplCategoriesOfClass Returns an enumerator over the CATIDs
implemented by the specified class.
EnumReqCategoriesOfClass Returns an enumerator over the CATIDs required
by the specified class.
See Also