IClassFactory2:IClassFactory

Article
06/30/2006

This interface enables a class factory object, in any sort of object server, to control object creation through licensing. This interface is an extension to IClassFactory. This extension enables a class factory executing on a licensed machine to provide a license key that can be used later to create an object instance on an unlicensed machine. Such considerations are important for objects like controls that are used to build applications on a licensed machine. Subsequently, the application built must be able to run on an unlicensed machine. The license key gives only that one client application the right to instantiate objects through IClassFactory2 when a full machine license does not exist.

When to Implement

Implement this interface on a class factory object if you need to control object creation through a license. A class that supports licensing should be marked in an object's type information with the [licensed] attribute on the object's coclass entry.

The CreateInstance method inherited from IClassFactory is allowed to return CLASS_E_NOTLICENSED to indicate that object creation is controlled through licensing. The caller can create an instance of this object only through IClassFactory2::CreateInstanceLic if the caller has a license key obtained from IClassFactory2::RequestLicKey. Otherwise, no object creation is allowed.

When to Use

Use this interface to create licensed objects or to obtain a license key that can be used in later creations.

Methods in Vtable Order

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

IClassFactory method	Description
CreateInstance	Creates an uninitialized object.
LockServer	Locks object application open in memory.

IClassFactory2 method	Description
GetLicInfo	Fills a LICINFO structure with information on the licensing capabilities of this class factory.
RequestLicKey	Creates and returns a license key that the caller can save and use later in calls to IClassFactory2::CreateInstanceLic.
CreateInstanceLic	Creates an instance of the licensed object given a license key from IClassFactory2::RequestLicKey.

Remarks

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

Requirements

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

Share via