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Delphi Cookbook
Delphi Cookbook

Delphi Cookbook: Over 60 hands-on recipes to help you master the power of Delphi for cross-platform and mobile development on multiple platforms , Second Edition

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Delphi Cookbook

Chapter 2. Becoming a Delphi Language Ninja

In this chapter, we will cover the following recipes:

  • Fun with anonymous methods – using higher-order functions
  • Writing enumerable types
  • RTTI to the rescue – configuring your class at runtime
  • Duck typing using RTTI
  • Creating helpers for your classes

Introduction

This chapter will explain some of the not-so-obvious features of the language and the RTL that every Delphi programmer should know. Anonymous methods, enumerable types, extended RTTI, and class helpers are powerful tools for every Delphi developer, but usually they are not mastered as they should be. In this chapter, there are ready-to-use recipes that use these concepts to implement something really useful.

Fun with anonymous methods – using higher-order functions

Since Version 2009, the Delphi language (or better, its Object Pascal dialect) supports anonymous methods. What's an anonymous method? Not surprisingly, an anonymous method is a procedure or a function that does not have an associated name. An anonymous method treats a block of code just like a value so that it can be assigned to a variable, used as a parameter to a method or returned by a function as its result value. In addition, an anonymous method can refer to variables and bind values to the variables in the context scope in which the anonymous method is defined. Anonymous methods are similar to closures defined in other languages such as JavaScript or C#. An anonymous method type is declared as a reference to a function:

type
  TFuncOfString = reference to function(S: String): String;

Anonymous methods (or anonymous functions) are convenient to pass as an argument to a higher-order function. What's a higher-order...

Writing enumerable types

When the for...in loop was introduced in Delphi 2005, the concept of enumerable types was also introduced into the Delphi language.

As you know, there are some built-in enumerable types. However, you can create your own enumerable types using a very simple pattern.

To make your container enumerable, implement a single method called GetEnumerator, that must return a reference to an object, interface, or record, that implements the following three methods and one property (in the sample, the element to enumerate is TFoo):

    function GetCurrent: TFoo;
    function MoveNext: Boolean;
    property Current: TFoo read GetCurrent;

There are a lot of samples related to standard enumerable types, so in this recipe you'll look at some not-so-common utilizations.

Getting ready

In this recipe, you'll see a file enumerable function as it exists in other, mostly dynamic, languages. The goal is to enumerate all the rows in a text file without actually opening, reading, and...

RTTI to the rescue – configuring your class at runtime

Since Delphi 2010, the Delphi RTTI has been greatly expanded. Now, it is comparable to what is called reflection in other languages such as C# or Java. A much-improved RTTI can dramatically change the way you write, or even think about, your code and your architecture. Now, it is possible to write highly flexible code without too much effort.

Getting ready

What we want to do in this recipe is dynamically create a class looking for it by name among the classes that have been linked in the executable (or loaded from dynamic packages). The goal is to change the behavior of the program using only an external file without relying on a lot of parameters and complex configuration code; just create the right class. Wonderful!

Let's say you've developed a program to do orders. Your program allows only one-line orders, so you cannot buy different things in the same orders (this is a sample!). The form is shown in this screenshot...

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&apos...

Introduction


This chapter will explain some of the not-so-obvious features of the language and the RTL that every Delphi programmer should know. Anonymous methods, enumerable types, extended RTTI, and class helpers are powerful tools for every Delphi developer, but usually they are not mastered as they should be. In this chapter, there are ready-to-use recipes that use these concepts to implement something really useful.

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Key benefits

  • Get to grips with Delphi to build and deploy various cross-platform applications
  • Design, develop, and deploy real-world applications by implementing a single source codebase
  • This swift guide will increase your productivity to develop applications with Delphi

Description

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 .

Who is this book for?

If you are an intermediate developer with a basic knowledge of Delphi and you want to develop cross-platform applications, then this book is for you. Familiarity with the fundamentals of RAD (Rapid Application Development) Studio is expected.

What you will learn

  • Develop visually stunning applications using FireMonkey
  • Deploy LiveBinding effectively with the right OOP approach
  • Create server-side programs to serve RESTful web services and provide data to your mobile apps
  • Use well-defined GUI design patterns to build mobile applications that provide a great user experience
  • Build mobile apps that read data from a remote server efficiently
  • Call the platform native API on Android and iOS even for an unpublished API
  • Manage software customization for your customer by making better use of an extended RTTI
  • Implement the most popular design pattern without wasting too much time on debugging and bug fixing /list
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Publication date : Jun 30, 2016
Length: 470 pages
Edition : 2nd
Language : English
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Length: 470 pages
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Vendor :
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Table of Contents

9 Chapters
1. Delphi Basics Chevron down icon Chevron up icon
2. Becoming a Delphi Language Ninja Chevron down icon Chevron up icon
3. Knowing Your Friends – the Delphi RTL Chevron down icon Chevron up icon
4. Going Cross-Platform with FireMonkey Chevron down icon Chevron up icon
5. The Thousand Faces of Multithreading Chevron down icon Chevron up icon
6. Putting Delphi on the Server Chevron down icon Chevron up icon
7. Riding the Mobile Revolution with FireMonkey Chevron down icon Chevron up icon
8. Using Specific Platform Features Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

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Roman Yankovsky Jul 13, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am honored to be the techincal reviewer of the second edition. It was an exciting adventure to take a look behind the curtains of book publishing. And I have to say that Daniel did a great job.Like any cookbook, this book is a collection of recipes. It is exactly what a “cookbook” should be. Recipes are very different - from the use of VCL styles to the drawing on a FMX ListView component, and from examples of functional programming in Delphi to importing a Java-library interface in Android. Over 60 recipes, according to the cover :)Personally for me, the most interesting part of this book is not the essence of the recipes themselves, but the fact that the author uses all Delphi innovations when it's possible. This was very interesting to watch. Delphi has been developing very quick in recent years, and we are not always aware of how much is new in the recent versions.I therefore recommend Delphi Cookbook primarily for those who still works with older versions of Delphi and wants to take a closer look at the innovations. Although those who work with the latest version will definetely find something to expand their horizons too. And it particularly useful as a reference book.
Amazon Verified review Amazon
Humberto Rodriguez Mar 07, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
One of the best Delphi books I've ever read through. Very useful and most are not.
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Software techie May 12, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent coverage and examples of many real-world problems solved simply and elegantly. I have used some of the recipes with great success.
Amazon Verified review Amazon
Spinettaro Sep 04, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I just finished reading "Delphi CookBook Second Edition" and I'm really, really satisfied.The style of the book is represented by a pragmatic approach, including solutions to real problems in the form of "recipes" (IMHO the best way, because it goes beyond what the normal documentation can provide).So it is possible to view the full power of Delphi and at the same time, see how it can put into practice for the solution of real problems.This book is an advanced level guide that covers all the key parts of Delphi linked to programming. You will read about Style, RTL, RTTI, Firemonkey, PPL, HTTP Native Library etc.. but above all: how they can solve multithreading problems, how use specific platform features, how use it to query and build RESTFul services, etc...In conclusion, these recipes are big treasures because they represent a perfect mix: a problem, a minimum theoretical to understand the underlying concepts and an elegant and efficient solution to the problem.Furthermore, most of the time, the solutions are enhanced by pattern and best practices in order to be more generic and reusable as possible (like a pattern must do).
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Breveglieri Marco Sep 04, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
“Delphi Cookbook - Second Edition” is a really great and very useful book.I have to say that I am a fan of “academic books”, these lengthy tomes that introduce you to a programming language or a specific technology and tell you everything about it, starting from the very beginning and going deep and deep into the topic, giving you a full 360-degrees knowledge about it.Delphi Cookbook does not belong to this category, but that is not a negative aspect: you have to consider that today time is a precious thing, and software – especially developer tools – evolves really fast, so reading endless books does not always pay well because they need a lot of effort and you must get to work on your project as soon as possible or you will be late for sure.Delphi Cookbook is very handy to use: say you must tackle a problem about the application you are building, you can search the book starting from the index and get the bit of information that helps you start getting your task done. If you are a smart developer, a tip is often all you need.But don’t get me wrong, this is not a bunch of old trivial tips and tricks that everyone already knows about: the book addresses up-to-date use cases that Delphi developers likely will have to deal with. Each recipe is like an extended design pattern that explains what you should do and especially why, so you can grasp the rationale behind it.Reading the book, you will find out that many of the proposed solutions leverage the actual Object Pascal language features and “out of the box” classes and components: this demonstrates how Delphi is a modern tool suitable for the needs of today’s development. Other recipes are full tutorials based on open source projects, like Delphi MVC Framework, with a full explanation of how to use them, from installation to deploy, often covering what is missing from official documentation.You will learn to use many techniques ranging from the user interface (like theming and owner drawing) to the business logic (like meta programming using the RTTI), from exposing data through a Web server to consuming REST services, covering all the aspects of building a complete software solution, for both desktop and mobile platforms.So if you are a Delphi developer and want to use the tool as it is meant to be nowadays, you must read this book.
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