How to read a text file as input data?

Hi,

I want to simulate a FIR filter, which reads a text file content as input data. I have tried with open a text file and call a function (entry) as a parameter, but it fails compilation. Because I cannot paste the code on this window, I attach the text .h file in the attachment. Please tell me how to access a text file in a method. Or you can tell me what is the best way to read text data file into the SystemC simulator.

Thanks,