How to integrate a c++ header, lib and DLL in a Simulink model as a block?

I have received from a vendor a package made of a C++ header (x.h), a library (x.lib) and a DLL file (x.dll). How can I integrate this into a Simulink model as a block ? Can Simulink derive the list of Input and Output ports of this block just by looking at the x.h file ? I guess the x.dll file needs to reside in the path for step execution, but is the x.lib file necessary ? Thank you for your answer.