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  • Book Overview & Buying QT5 Blueprints
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QT5 Blueprints

QT5 Blueprints

By : Huang
4 (9)
Buy this Book
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QT5 Blueprints

QT5 Blueprints

4 (9)
By: Huang
Buy this Book

Overview of this book

If you are a programmer looking for a truly cross-platform GUI framework to help you save your time by side-stepping the incompatibility between different platforms and building applications using Qt 5 for multiple targets, then this book is most certainly intended for you. It is assumed that you have a basic programming experience of C++ and fundamental knowledge about Qt.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Creating Your First Qt Application
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1. Creating Your First Qt Application
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Creating a new project
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Changing the layout of widgets
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Understanding the mechanism of signals and slots
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Connecting two signals
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Creating a Qt Quick application
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Connecting C++ slots to QML signals
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Summary
2
2. Building a Beautiful Cross-platform Clock
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2. Building a Beautiful Cross-platform Clock
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Creating a basic digital clock
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Tweaking the digital clock
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Saving and restoring settings
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Building on the Unix platforms
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Summary
3
3. Cooking an RSS Reader with Qt Quick
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3. Cooking an RSS Reader with Qt Quick
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Understanding model and view
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Parsing RSS Feeds by XmlListModel
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Tweaking the categories
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Utilizing ScrollView
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Adding BusyIndicator
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Making a frameless window
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Debugging QML
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Summary
4
4. Controlling Camera and Taking Photos
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4. Controlling Camera and Taking Photos
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Accessing the camera in Qt
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Controlling the camera
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Displaying errors on the status bar
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Permanent widgets in the status bar
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Utilizing the menu bar
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Using QFileDialog
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QML camera
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Summary
5
5. Extending Paint Applications with Plugins
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5. Extending Paint Applications with Plugins
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Drawing via QPainter
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Writing static plugins
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Writing dynamic plugins
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Merging plugins and main program projects
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Creating a C++ plugin for QML applications
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Summary
6
6. Getting Wired and Managing Downloads
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6. Getting Wired and Managing Downloads
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Introducing Qt network programming
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Utilizing QNetworkAccessManager
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Making use of the progress bar
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Writing multithreaded applications
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Managing a system network session
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Summary
7
7. Parsing JSON and XML Documents to Use Online APIs
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7. Parsing JSON and XML Documents to Use Online APIs
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Setting up Qt for Android
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Parsing JSON results
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Parsing XML results
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Building Qt applications for Android
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Parsing JSON in QML
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Summary
8
8. Enabling Your Qt Application to Support Other Languages
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8. Enabling Your Qt Application to Support Other Languages
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Internationalization of Qt applications
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Translating Qt Widgets applications
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Disambiguating identical texts
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Changing languages dynamically
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Translating Qt Quick applications
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Summary
9
9. Deploying Applications on Other Devices
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9. Deploying Applications on Other Devices
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Releasing Qt applications on Windows
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Creating an installer
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Packaging Qt applications on Linux
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Deploying Qt applications on Android
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Summary
10
10. Don't Panic When You Encounter These Issues
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10. Don't Panic When You Encounter These Issues
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Commonly encountered issues
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Debugging Qt applications
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Debugging Qt Quick applications
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Useful resources
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Summary
11
Index
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Index

Debugging Qt Quick applications

We will use the Weather_QML project from Chapter 7, Parsing JSON and XML Documents to Use Online APIs, as a demonstration program to show how to debug a Qt Quick application.

First, we need to ensure that QML debugging is enabled. Open the Weather_QML project in Qt Creator. Then, perform the following steps:

  1. Switch to the Projects mode.

  2. Expand the qmake step in Build Steps.

  3. Check Enable QML debugging if it's not checked.

    Tip

    Debugging QML will open a socket at a well-known port, which poses a security risk. Anyone on your network could connect to the debugging application and execute any JavaScript function. Therefore, you have to make sure there are appropriate firewall rules.

The same procedure is used to start QML debugging, which is to navigate to Debug | Start Debugging | Start Debugging, or click the Debug button, or just press F5. It may trigger a Windows Security Alert, shown in the following screenshot. Don't forget to click on the Allow access button.

Once...

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QT5 Blueprints
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