Delphi Programming Tutorial – Lesson 2: Types of Programs

Delphi Programming Tutorial – Lesson 2: Types of Programs:

Learn which types of programs can be developed with programming languages like Delphi.

Delphi 7 was introduced in August 2002 and it became the standard Delphi version used by more Delphi developers than any other version of Delphi. It is one of the most successful integrated development environments (IDEs) created by Borland because of its stability, speed and low hardware requirements. It also remained in active use as of 2011.

Delphi 7 supported Windows XP themes, and also added more support for Web application development. It was also the last version of Delphi not requiring mandatory software activation.

Delphi supports rapid application development (RAD). Among features supporting RAD are application framework and visual window layout designer. It also has support for native cross-compilation.

Delphi uses the Pascal-based programming language named Object Pascal – also a language introduced by Borland, and it compiles Delphi source code into native x86 code.

It includes visual component library (VCL), support for component object model (COM) independent interfaces with reference counted class implementations, and support for many third-party components. Interface implementations can be delegated to properties of classes. Message handlers are implemented by tagging a method of a class with the integer constant of the message to handle.

Delphi also supports database connectivity, with various built-in database components. VCL includes many database-aware and database access components.

Delphi is a strongly typed high-level programming language, intended to be easy to use and originally based on the earlier Object Pascal language.

Pascal was originally developed as a teaching language, without low-level programming facilities or access to hardware and with no emphasis on efficiency; Turbo Pascal and its descendants, including Delphi, are designed for efficiency and support access to hardware and low level programming, with the facility to incorporate code written in assembly language and other languages.

Metaclasses are first class objects. Objects are actually references to the objects (just like in Java and many other modern programming languages).

Delphi includes an integrated IDE. The Delphi products all ship with a Visual Component Library (VCL), including most of its source code. Third-party components (sometimes with full source code) and tools to enhance the IDE or for other Delphi related development tasks are available, some free of charge.

The IDE includes a GUI for localization and translation of created programs that may be deployed to a translator; there are also third-party tools with more features for this purpose. The VCL framework maintains a high level of source compatibility between versions, which simplifies updating existing source code to a newer Delphi version.

The Delphi IDEs since Delphi 2005 increasingly support refactoring features such as method extraction and the possibility to create UML models from the source code or to modify the source through changes made in the model.

Delphi has large communities on Usenet and the web. When Delphi was owned by Codegear, many of its employees actively participated.

Each new release of Delphi attempts to be as compatible as possible with earlier versions, so that already-developed software and libraries can be retained. Incompatibility necessarily arises as new functionality is added, e.g., with support by Firemonkey of other platforms than Windows.

Enjoy the tutorial!

Best viewed in HD. To change your settings to HD:

1. Click on the Gear-icon (Settings) at the bottom of the YouTube Video Player.

2. Select “720p HD” and wait a few moments for the setting to take effect.

For more Delphi video tutorials also join us at

You may also want to visit the following resources for more information:


LearnDelphi says:

I want to thank everybody that participated in these discussions – also to subscribers that sent “thank you’s” and words of encouragement. I’m a full-time Microsoft Certified Trainer at an IT college during the day, where I teach various programming languages and software development technologies. So, I only develop these videos lessons after-hours and in my free time – sometimes well into the night and early-morning hours.
YOUR words of appreciation and encouragement is what is driving me to want to continue with this service. YOU are the reason why I enjoy sharing my knowledge and skills – and for that, I THANK YOU!
PLEASE: If you enjoyed a video lesson, show your appreciation by clicking/tapping the “LIKE” button or link!! You are also welcome to leave a comment. These videos are for the world to see, so I will also appreciate it if you share it with all your friends and classmates! Please also “LIKE” our Facebook page at:
What’s next!? I’m already busy with the plans for the next chapter of the DelphiSchools Video Coaching Programme!! This is what you can expect:
Lesson 27:           Input, Processing and Output
Lesson 28:           Drawing an IPO Table
Lesson 29:           Exercises – Drawing IPO tables
Lesson 30:           Understanding Data Types
Lesson 31:           Understanding Variables
Lesson 32:           Naming Variables
Lesson 33:           Declaring and Using Variables
Lesson 34:           Numeric Operators
Lesson 35:           Data Compatibility
Lesson 36:           Order of Precedence of Operators
Lesson 37:           Formatting Real Numbers
Lesson 38:           Receiving Input in an InputBox
Lesson 39:           Exercises – Working with Variables
Lesson 40:           Understanding Constants
Lesson 41:           Variable Duration
Lesson 42:           Variable Scope
Lesson 43:           Exercises – Working with Class-level Variables
Lesson 44:           Understanding TOE Charts
Lesson 45:           Drawing a TOE Chart
Lesson 46:           Exercises – TOE Charts
Lesson 47:           Tips and Tricks
Like the lessons in Chapter 1, I will publish these videos on a lesson-by-lesson basis – in other words, when I’m finished developing a lesson, and after testing it, I will load it on YouTube. I try to complete at least one lesson a week, but sometimes you may have to wait a little longer. The lessons in Chapter 2 will also be jam-packed with easy-to-understand analogies, high resolution graphics and animations, and fun-to-follow practices!
If you have not subscribed to this channel yet, I hope you will do so immediately – please join me in all the fun!
All the videos in Chapter 1 is available in the following playlist:

Kind regards
Gerhard Visagie

 Write a comment


Do you like our videos?
Do you want to see more like that?

Please click below to support us on Facebook!