The beginning of each chapter will begin with a little theory that should help consolidate your understanding. Thereafter, a series of examples are used to explain the concepts and to help the reader grasp the topic better.

This book also avoids continuing with examples from previous chapters. Each chapter's examples are short and do not require the reader to have knowledge of previous chapters. That way, you can pick any chapter you link and work through it.

Appropriate links to set up the environment on Windows have been provided. Linux and macOS platforms have been catered for directly in this book.

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Getting-Started-with-Qt-5. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://www.packtpub.com/sites/default/files/downloads/9781789956030_ColorImages.pdf.

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "To set the password to the connection parameter, the code fragment, db_conn.setPassword(""), is issued."

A block of code is set as follows:

QSqlDatabase db_conn =
        QSqlDatabase::addDatabase("QMYSQL", "contact_db");

db_conn.setHostName("127.0.0.1");
db_conn.setDatabaseName("contact_db");
db_conn.setUserName("root");
db_conn.setPassword("");
db_conn.setPort(3306);

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

[default]
exten => s,1,Dial(Zap/1|30)
exten => s,2,Voicemail(u100)
exten => s,102,Voicemail(b100)
exten => i,1,Voicemail(s0)

Any command-line input or output is written as follows:

% mkdir helloWorld
% ./run_executable

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "It displays the text Hello world ! in a label."