Book Image

Delphi Cookbook - Second Edition

By : Daniele Teti
Book Image

Delphi Cookbook - Second Edition

By: Daniele Teti

Overview of this book

Delphi is a cross-platform Integrated Development Environment (IDE) that supports rapid application development for Microsoft Windows, Apple Mac OS X, Google Android, and Apple iOS. It helps you to concentrate on the real business and save yourself the pain of wandering amid GUI widget details, or having to tackle inter-platform incompatibilities. It also has a wide range of drag-and-drop controls, helping you code your business logic into your business model, and it compiles natively for desktop and mobile platforms. This book will teach you how to design and develop applications, deploy them on the cloud platform, and distribute them within an organization via Google Play and other similar platforms. You will begin with the basics of Delphi and get acquainted with JSON format strings, XSLT transformations, unicode encodings and various types of streams. We then move on to more advanced topics such as developing higher-order functions and using enumerators and RTTI. You will get an understanding of how Delphi RTL functions and how to use FireMonkey in a VCL application. We will then cover topics such as multithreading, using the parallel programming library and putting Delphi on a server. We will also take a look at the new feature of WebBroker Apache modules and then ride the mobile revolution with FireMonkey. By the end of the book, you will be able to develop and deploy cross-platform applications using Delphi .
Table of Contents (10 chapters)
9
Index

Controlling remote application using UDP


What's UDP? User Datagram Protocol, or UDP, is a connectionless protocol used by everyone every day, but it seems that not too many people know it. However, it can be really useful to solve particular network problems. Like TCP, UDP works at transport layer TCP/IP model but they have very different usage. Compared to TCP, UDP is a simpler message-based connectionless protocol. Connectionless protocols do not set up a dedicated end-to-end connection, instead communication is achieved by transmitting information in one direction from source to destination without verifying the readiness or state of the receiver. However, one primary benefit of UDP over TCP is the application to voice over internet protocol (VoIP), where latency and jitter are the primary concerns. It is assumed in VoIP UDP that the end users provide any necessary real-time confirmation that the message has been received.

Here are some features of UDP:

  • Unreliable: When a message is sent...