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 (15 chapters)
Delphi Cookbook Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Duck typing using RTTI


 

"When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck."

 
 --James Whitcomb Riley

Clear, isn't it? What may not be so clear is that this approach can be used also in computer programming. Yes, even without an actual duck!

Getting ready

Referring to duck typing, Wikipedia gives the following explanation (http://en.wikipedia.org/wiki/Duck_typing).

In computer programming with object-oriented programming languages, duck typing is a style of typing in which an object's methods and properties determine the valid semantics, rather than its inheritance from a particular class or the implementation of an explicit interface.

How can all these concepts be used in everyday programming? This is the question that this recipe aims to answer.

Let's say that you have a form and you want to inform the user that something bad happened by changing all the colorable components to clRed. I don't know what the property Color means for any...