The other question is what if I have a C++ (instead of C) program, and I want to make a DLL out of it to call from FoxPro. Is it possible? If so, how?

You can't call C++ objects or methods directly from VFP due to the fact that
C++ mangles names and requires stackframes that VFP can't access.

What this means is that you should write a wrapper around any C++ code that
handles the class instantiation and calling of methods. This true for any
API access, really. Only other C++ programs typically can call C++ classes
directly and even then you have to go through all sorts of girations to
get the nameing conventions to sync.

+++ Rick ---