Code 128 - ISO/IEC 15417-2000 implementation : Barcodes are used widely for many purposes. Many user-friendly applications need to control flow of products and the barcodes are often the only thing which can help to organize this process. Other applications use barcodes to speed up processing of customer' requests. There are many types of barcodes, but one of most used is Code 128 barcode. Here we offer our implementation of this barcode based on C++ language and our customers find it useful to inculcate the barcode processing in their application.