XE is a slightly simplified install. For the EE edition the examples are in the Examples zip https://www.oracle.com/technetwork/database/enterprise-edition/downloads/oracle18c-windows-180000-5066774.html
I don't have a solution for XE users.
Regardless of availability, in general you should consider calling OCI (not OCCI) from C++ since this is more fully featured and there are more examples out there. There are even wrapper libraries like https://oracle.github.io/odpi/ and OCILIB.