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Editorial Team
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Asked: 2026-05-11T18:09:52+00:00

I understand that CoCreateInstance finds the COM server for the given class id, creates

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I understand that CoCreateInstance finds the COM server for the given class id, creates the object instance for that id and retrieves an interface from that object instance. CoGetClassObject() finds the COM server for the class id, creates an instance of the class factory for that class id and retrieves that class factory interface which can be then used for creating actual objects.

How else do these functions differ when used to create objects on the same machine? Do they work the same way but only cause different code to be invoked in the exactly same COM server?

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  1. Editorial Team

    CoGetClassObject essentially returns you a pointer to a factory for a particular interface. Under the hood, CoCreateInstance uses CoGetClassObject. The advantage of calling CoGetClassObject is that it allows you to only have to create the class factory once if you want to create many instances of a particular object.

    The MSDN section on CoGetClassObject has a brief discussion on how you can take advantage of this functionality.

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