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Delphi Cookbook
Delphi Cookbook

Delphi Cookbook: Recipes to master Delphi for IoT integrations, cross-platform, mobile and server-side development , Third Edition

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Profile Icon Spinetti Profile Icon Daniele Teti
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Full star icon Full star icon Full star icon Full star icon Full star icon 5 (3 Ratings)
Paperback Jul 2018 668 pages 3rd Edition
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Arrow left icon
Profile Icon Spinetti Profile Icon Daniele Teti
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$54.99
Full star icon Full star icon Full star icon Full star icon Full star icon 5 (3 Ratings)
Paperback Jul 2018 668 pages 3rd Edition
eBook
$9.99 $43.99
Paperback
$54.99
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Free Trial
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Delphi Cookbook

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
  • Using enumerable types to create new language features
  • RTTI to the rescue—configuring your class at runtime
  • Duck typing using RTTI
  • BOs validation using RTTI attributes
  • Creating helpers for your classes

Introduction

This chapter will explain some of the not-so-obvious features of the language and 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 them 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...

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.

A type is defined as enumerable if it can be iterated. That is, it can be the target of the for...in loop.

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, which must return a reference to an object, interface, or record that implements the following two methods and one property (in the example, 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...

Using enumerable types to create new language features

Enumerable types, thanks to their versatility, are one of the most amazing language features in Delphi. In the previous recipe, we saw what they are and how they are used; now I want to introduce them in another way. They make the impossible possible as enumerables iterate over infinite ranges you need!

Did I stimulate your curiosity enough? Well, let's proceed!

Getting ready

Suppose you have to solve a Project Euler Problem 10 (https://projecteuler.net/problem=10); that is, to find the sum of all the primes below 2 million. How can you iterate through an infinite container like prime numbers?

...

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 to dynamically create a class by 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...

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 also be used in computer programming. Yes, even without an actual duck!

For design patterns lovers, duck typing is the smartest way to achieve the Visitor pattern goal.

Getting ready

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

"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...

BOs validation using RTTI attributes

What does Business Object (BO) mean?

"A business object is an actor within the business layer of a layered object-oriented computer program that represents a part of a business or an item within it.... It represents business entities such as an invoice, a transaction or a person."
- Techopedia

If we fine-tune our applications, we are dealing with BOs—TCustomer, TOrder, and TInvoice are classic examples. In the end we always go to meet the same necessity: their validation; that is, to verify their validity through appropriate procedures. Regardless of whether you use an ORM, a data access framework such as FireDAC, or another, it is always a good idea to develop the BO layer to remain independent of them and respect separation of concerns (SoC).

In this recipe, we'll learn about RTTI Attributes, and we'll see how...

Creating helpers for your classes

As you know (and if you don't know, you can read the documentation about it), a class helper is a type that can be associated to a class. When a class helper is associated with another class, all the methods and properties defined in the helper are also available in the other class and in its descendants. Helpers are a way to extend a class without using inheritance; however, it is not the same thing as inheritance. In other words, if the TFooHelper helper is in the same scope as TFoo, the compiler's resolution scope then becomes the original type (TFoo), plus the helper (TFooHelper). So, if the TFoo class defines the DoSomething method and the TFooHelper (the TFoo class helper) defines DoAnotherThing, when TFoo is used in the same scope as the TFooHelper, the TFoo instances, and all its descendants, also have the DoAnotherThing method...

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Key benefits

  • Get to grips with Delphi to build and deploy various cross-platform applications
  • Design and deploy real-world apps by implementing a single source codebase
  • Build robust and optimized GUI applications with ease

Description

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.

Who is this book for?

Delphi Cookbook is for intermediate developers with a basic knowledge of Delphi who want to discover and understand all the development possibilities offered by it.

What you will learn

  • Develop visually stunning applications using FireMonkey
  • Deploy LiveBinding effectively with the right object-oriented programming (OOP) approach
  • Create RESTful web services that run on Linux or Windows
  • Build mobile apps that read data from a remote server efficiently
  • Call platform native API on Android and iOS for an unpublished API
  • Manage software customization by making better use of an extended RTTI
  • Integrate your application with IOT
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Table of Contents

11 Chapters
Delphi Basics Chevron down icon Chevron up icon
Becoming a Delphi Language Ninja Chevron down icon Chevron up icon
Knowing Your Friends – The Delphi RTL Chevron down icon Chevron up icon
Going Cross-Platform with FireMonkey Chevron down icon Chevron up icon
The Thousand Faces of Multithreading Chevron down icon Chevron up icon
Putting Delphi on the Server Chevron down icon Chevron up icon
Linux Development Chevron down icon Chevron up icon
Riding the Mobile Revolution with FireMonkey Chevron down icon Chevron up icon
Using specific platform features Chevron down icon Chevron up icon
Delphi and IoT Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(3 Ratings)
5 star 100%
4 star 0%
3 star 0%
2 star 0%
1 star 0%
Amazon Customer Sep 08, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Perfect cookbook to delphi...
Amazon Verified review Amazon
Nivaldo de Amorim Assis Jul 24, 2023
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Ótimo livro.
Amazon Verified review Amazon
Steven S. Weston Sep 12, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Considering the value of time, if only one solution works, that pays for the book in time saved. The book is better than others books of this kind in trms of formatting, editing, and headings.
Amazon Verified review Amazon
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