To get the most out of this book

All the code in this book can be compiled and run from Qt Creator using Qt 5.11. You can do it from your preferred OS: Windows, Linux, or Mac.

About the mobile-specific chapters, either an Android or an iOS device works, but it is not mandatory (the simulator/emulator can be enough).

Chapter 6, Even Qt Deserves a Slice of Raspberry Pi, offers to build an application running on a Raspberry Pi. Although it is more fun if we can do it with a real Raspberry Pi, it is not necessary to have one to complete the chapter.

Download the example code files

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.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.packtpub.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/Mastering-Qt-5-Second-Editon. 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!

Conventions used

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The qmake command is executed with the project .pro file."
A block of code is set as follows:

void MemoryWidget::updateSeries()
{
 double memoryUsed = SysInfo::instance().memoryUsed();
 mSeries->append(mPointPositionX++, memoryUsed);
 if (mSeries->count() > CHART_X_RANGE_COUNT) {
 QChart* chart = chartView().chart();
 chart->scroll(chart->plotArea().width()
 / CHART_X_RANGE_MAX, 0);
 mSeries->remove(0);
 }
}

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

windows {
    SOURCES += SysInfoWindowsImpl.cpp
    HEADERS += SysInfoWindowsImpl.h

    debug {
        SOURCES += DebugClass.cpp
        HEADERS += DebugClass.h
    }
}

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

/path/to/qt/installation/5.11/gcc_64/bin/qmake -makefile -o Makefile project.pro

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "In Qt Creator, when you click on the Build button, qmake is invoked."

Warnings or important notes appear like this.

Tips and tricks appear like this.