How do I get the RTW filename of a block I am building from a script?

I have a block, buried in a model, and I am trying to get the primary .cpp file name out of it (using a script). We are using encapsulated cpp, and there are a handful of files, but I am wishing to get the basic, top-level file name (perhaps the .h file would be more appropriate, since that is where the class definition is).

I am currently able to get the interface spec using: lcInterfaceSpec.getClassName;

How about the path where this file gets generated?