ICatRegister

The ICatRegister interface provides methods for registering and unregistering component category information in the Registry. This includes both the human-readable names of categories and the categories implemented/required by a given component or class.

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 ICatRegister.

When to Use

The owner of a category uses this interface to register or unregister the human-readable names. The owner of a component uses this interface to add or remove categories implemented or required by this component.

Methods in Vtable Order

IUnknown Methods	Description
QueryInterface	Returns pointers to supported interfaces.
AddRef	Increments reference count.
Release	Decrements reference count.

ICatRegister Methods	Description
RegisterCategories	Registers one or more component categories.
UnRegisterCategories	Removes the registration of one or more component categories.
RegisterClassImplCategories	Registers the class as implementing one or more component categories.
UnRegisterClassImplCategories	Removes one or more implemented category identifiers from a class.
RegisterClassReqCategories	Registers the class as requiring one or more component categories.
UnRegisterClassReqCategories	Removes one or more required category identifiers from a class.