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QT5 Blueprints

By : Symeon Huang
Book Image

QT5 Blueprints

By: Symeon Huang

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QT5 Blueprints
Symeon Huang
Mar, 2015 | 272 pages
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Table of Contents (17 chapters)
Qt 5 Blueprints
Qt 5 Blueprints
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Creating Your First Qt Application
Creating Your First Qt Application
Creating a new project
Changing the layout of widgets
Understanding the mechanism of signals and slots
Connecting two signals
Creating a Qt Quick application
Connecting C++ slots to QML signals
Summary
2
Building a Beautiful Cross-platform Clock
Building a Beautiful Cross-platform Clock
Creating a basic digital clock
Tweaking the digital clock
Saving and restoring settings
Building on the Unix platforms
Summary
3
Cooking an RSS Reader with Qt Quick
Cooking an RSS Reader with Qt Quick
Understanding model and view
Parsing RSS Feeds by XmlListModel
Tweaking the categories
Utilizing ScrollView
Adding BusyIndicator
Making a frameless window
Debugging QML
Summary
4
Controlling Camera and Taking Photos
Controlling Camera and Taking Photos
Accessing the camera in Qt
Controlling the camera
Displaying errors on the status bar
Permanent widgets in the status bar
Utilizing the menu bar
Using QFileDialog
QML camera
Summary
5
Extending Paint Applications with Plugins
Extending Paint Applications with Plugins
Drawing via QPainter
Writing static plugins
Writing dynamic plugins
Merging plugins and main program projects
Creating a C++ plugin for QML applications
Summary
6
Getting Wired and Managing Downloads
Getting Wired and Managing Downloads
Introducing Qt network programming
Utilizing QNetworkAccessManager
Making use of the progress bar
Writing multithreaded applications
Managing a system network session
Summary
7
Parsing JSON and XML Documents to Use Online APIs
Parsing JSON and XML Documents to Use Online APIs
Setting up Qt for Android
Parsing JSON results
Parsing XML results
Building Qt applications for Android
Parsing JSON in QML
Summary
8
Enabling Your Qt Application to Support Other Languages
Enabling Your Qt Application to Support Other Languages
Internationalization of Qt applications
Translating Qt Widgets applications
Disambiguating identical texts
Changing languages dynamically
Translating Qt Quick applications
Summary
9
Deploying Applications on Other Devices
Deploying Applications on Other Devices
Releasing Qt applications on Windows
Creating an installer
Packaging Qt applications on Linux
Deploying Qt applications on Android
Summary
10
Don't Panic When You Encounter These Issues
Don't Panic When You Encounter These Issues
Commonly encountered issues
Debugging Qt applications
Debugging Qt Quick applications
Useful resources
Summary
Index
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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