Book Image

Delphi Cookbook, - Third Edition

By : Daniele Spinetti, Daniele Teti
Book Image

Delphi Cookbook, - Third Edition

By: Daniele Spinetti, Daniele Teti

Overview of this book

Delphi is a cross-platform integrated development environment (IDE) that supports rapid application development on different platforms, saving you the pain of wandering amid GUI widget details or having to tackle inter-platform incompatibilities. Delphi Cookbook begins with the basics of Delphi and gets you acquainted with JSON format strings, XSLT transformations, Unicode encodings, and various types of streams. You’ll then move on to more advanced topics such as developing higher-order functions and using enumerators and run-time type information (RTTI). As you make your way through the chapters, you’ll understand Delphi RTL functions, use FireMonkey in a VCL application, and cover topics such as multithreading, using aparallel programming library and deploying Delphi on a server. You’ll take a look at the new feature of WebBroker Apache modules, join the mobile revolution with FireMonkey, and learn to build data-driven mobile user interfaces using the FireDAC database access framework. This book will also show you how to integrate your apps with Internet of Things (IoT). By the end of the book, you will have become proficient in Delphi by exploring its different aspects such as building cross-platforms and mobile applications, designing server-side programs, and integrating these programs with IoT.
Table of Contents (12 chapters)

Reading data from Raspberry PI

In the previous recipes we saw how to communicate something to Raspberry PI, in this recipe we are going to close the recipes about Raspberry PI with the opposite operation: how to read data that Raspberry PI controls.

Getting ready

In this recipe we will use the same circuit built previously. The goal is to make small changes to the TCP / IP server, so that at the request of a specific light bulb status it responds with a code to identify whether it is ON or OFF.

We are going to use:

  • Raspberry PI 3 Model B
  • Two Channel Relay Modules (http://wiki.sunfounder.cc/index.php?title=2_Channel_5V_Relay_Module)
  • Two light bulbs and relative supply power (the important thing is that the light bulbs have...