Convert C to Class

I have a C++ DLL with conventional C procedures and functions to be called by VB program and the routines are working properly. Now I need to provide Progress Bar at the status window of VB main program and display AVI (both to be done by C program for performance reason) during the procedure execution.

I wonder if there is any alternatives other than convert my procedures and functions to class structure. If none, what is the easiest steps?

Thank you.

Why would you want to convert them to classes?

Because I want to display progress bar and show AVI during execution of the C procedure.

Thank you.

What's that got to do with classes?

I have got a ProgressBar class and AVI class that can perform my desired functions and I wish to make use of these two classes but I don't know how.

Thank you.

Declare the normal procedures as
extern "C"
and let them use the classes.