ICatRegister:IUnknown

This 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 the CoCreateInstance function, 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

The following table shows the methods for this interface in the order that the compiler calls the methods. Like all COM interfaces, this interface inherits the methods for the IUnknown interface.

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

Remarks

To determine whether the platform supports this interface, see Determining Supported COM APIs.

Requirements

OS Versions: Windows CE 3.0 and later.
Header: Comcat.h, Comcat.idl.
Link Library: Ole32.lib, Uuid.lib.

Last updated on Wednesday, April 13, 2005

© 2005 Microsoft Corporation. All rights reserved.