ClassFactory Class Reference

#include <ClassFactory.h>

Public Member Functions
	ClassFactory (ClassID id, BossConstructor classFact=nil)
ClassID	GetClassID ()
BossConstructor	GetFactory ()

Static Public Member Functions
static void	InstallClasses (PluginID ownerComponent)

Detailed Description

By default, all bosses are implemented using pre-supplied implementations of IControllingUnknown. You can supply your own implementation for your boss if you supply a class factory that will create the boss on demand from the object model. You should try this only if you know what you're doing – it's not a recommended way to fix problems, and solutions using this method are inherently fragile. You've been warned.

If you must do it, here's how it works. First declare a factory function, based on the name of the boss.

    void *CreateMyBoss(ClassID clsID)

        {   return new MyControllingUnknown(clsID); }

Then use this macro to declare a dummy usage for your Create function, so the factory won't get stripped out by the linker:

    CREATE_CLASSFACTORY(MyBoss, kMyBoss)

If you don't have one already, make a ClassFactoryList.h file, similar to a FactoryList.h file. Add a line to the file that declares your special boss type:

    REGISTER_CLASSFACTORY(MyBoss, kMyBoss)

Your Class.fr file should include a resource declaring the boss. This declares to the object model that when it gets a request to create your boss, it should use your factory function. You can do this as follows:

    resource FactoryList (129)

    {

        kClassIDSpace,

        {

             #include "MyClassFactoryList.h" 

        }

    };