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

Save space using System.Zip


Historically, Delphi contains the TZCompressionStream and the TZDecompressionStream to respectively compress and decompress streams of bytes using the zlib format. These classes are quite useful but are quite low level, being simply a stream compressor. In this recipe, we'll use a high-level class to compress and decompress folders and files. It is quite limited in terms of possibilities (you can compress and decompress files and folders, nothing more) but is very simple to use. Just keep in mind that this class is very specialized, so if you need some compression library to work with network protocols or on the fly compression/decompression, don't use this. But if you need a no-brain solution to compress something, this is the way.

The ZIP file format doesn't need presentation. However, some recap can be useful.

 

"ZIP is an archive file format that supports lossless data compression. A .ZIP file may contain one or more files or folders that may have been compressed...