Call a waitbar from within a DLL written in C

Example code for embedding a call to the Matlab waitbar() function from within a DLL written in C

When a DLL takes a long time to run, things go silent. It can look like the program has crashed even when it is running along just fine. The Matlab waitbar() function can be used in Matlab, but a waitbar is not available in C. However, Matlab can be called from C, so the user can still be notified that processing is still taking place. This code is an example of how to call the waitbar() from within a DLL that is written in C.