Object Pascal Handbook for Delphi 10.4 Sydney demos source code
The book content is copyright 2015-2020 Marco Cantu, www.marcocantu.com. The demo source code copy is copyrighted by Marco, but can be used freely in your own applications, free and commercial.
The ebook will be available from Embarcadero and directly from me, the printed version is available on Amazon, see www.marcocantu.com/objectpascalhandbook/ for more information.