bcgen | A bytecode generator for PHP7 | Bytecode library

I would like to get a class or function, if possible written in VB.NET, to add it to my projects. This class or function should be able to receive a text and return it as Barcode 128 encoded text.

I found lot of solutions for generating the barcode images directly, but what I need it's only the part which converts a text to a Standard Code 128 encoded text, then I will show it using a Barcode font.

I also found some codes to do it, but the returned encoded text is not the expected one, because I cannot read it with the Barcode Reader, or sometimes appears a char which cannot be represented by the barcode font.

The encoder should be able to convert this:

15868/039

Into this:

Í/vÈ8/039[Î

As this online converter can do it https://www.bcgen.com/fontencoder/ when you click on the button [Code 128]