Questions about barcode printer program

Hi, I have a simple question here.
I'm a Computer Engineering student, and my programming level is still low. But I was wondering how to make a program to draw Barcodes.
I just need to download the font (http://www.dafont.com/pt/code39.font) that represents the barcode standard and make a program to convert it?

I want to enter a string and print it as a barcode.

My first idea was to receive this string and print it with the barcode font. But I'm not sure if this is correct.
I'm not interested in GUI or anything right now, just to receive a string and print is as a barcode in a text file.
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