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.
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.
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.
| 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. |
Windows NT: Use version 5.0 or later.
Windows: Unsupported.
Windows CE: Unsupported.
Header: Declared in comcat.h.