This class represents the I/O port attribute specification used to connect an external file to a graph input or output port for simulation purposes.
FileIO(std::string data_file); FileIO(std::string logical_name, std::string data_file);
data_file argument is
the path name of an external file relative to the application project directory that
is opened for input or output during simulation. The
logical_name must be the same as the annotation field of the
corresponding port as presented in the logical architecture interface