Questions tagged [qt]

Qt is a cross-platform application and UI framework for developers using C++ or QML, a CSS & JavaScript like-language. (Also use the [c++] tag for C++ code.)

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1answer
80 views

Create HTML structure dynamically

We had a long HTML string with information about the makers of our software. However, for i18n this was unwieldy. So I started to refactor, so only each person's description is translateable, not all ...
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0answers
22 views

Extensible tree header context menu

I have a Qt tree view which has a custom tree header. The tree has a so called mode, by default there are two. During each of the modes a different tree is shown. The mode switcher is presented as a ...
4
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2answers
181 views

Parser for STL stereolithography data files [closed]

I'm parsing STL files to load the coordinates. My code is: ...
2
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1answer
37 views

Qt / C++/ Warehouse Club Management System

I am building a primitive Store Management System based on Qt and would appreciate some feedback. Classes: ManagementSystem - the logic unit of the system ...
5
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0answers
36 views

Interfaces and OOP Design for Image Editor software

I'm new to C++ programming, and I'm building an Image Editor software like Lightroom/CameraRaw from scratch. Apart from procedural code (actually seems that all the functions works correctly) my goal ...
8
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2answers
211 views

C++ Snake game using Qt-framework

I made a QT version of "Snake console game in C++" using Qt Creator 4.9.0 on Windows 7: I would like to know what can be improved, focused on the QT stuff since im new to it. I seperated the program ...
4
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1answer
87 views

Filter for CANbus frames

The actual data types here are probably not relevant to post an answer. I use Qt types here, but the question should apply for other structured types as well. I ...
6
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1answer
92 views

Qt Number Generator v2

Link to the old question. I tried to learn some new things from the answers and here's what I did: Used Qt Designer so that in Config.h, all member variables and ...
5
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2answers
161 views

GUI Number Generator in QT C++

I'm pretty new to Qt but already have a little experience with C++ so the first "project" I wanted to try out was a GUI random number generator. I am looking for some advices either in naming ...
4
votes
1answer
65 views

Enum class for weight units

I have some enum classes for units, like Weight units (KG and LB). I am translating the code to Qt C++ from Java, and I'm wondering what the best way to do this is as enums cannot have constructors in ...
2
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0answers
8 views

QVSquareLayout implementation for Qt that makes all internal items to be squared

qsquarelayout.h ...
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0answers
159 views

Transfering Image Data with QTCPSocket

In my program I am transferring image files continuously through QTCPSocket for each frame I am creating new connection which I believe causes the performance problems. But I couldn't transform my ...
4
votes
1answer
278 views

C++ Qt simple GUI game

I'm trying to learn how to use Qt (5.11.1) for GUI applications so I've done a simple memory game where 12 tiles are displayed and every time the user clicks on a tile it will show an image, so they ...
3
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0answers
38 views

Basic Qt5 UI with button [closed]

I have the following Qt class: mainwindow.h class MainWindow : public QWidget { Q_OBJECT QPushButton* m_button; public: explicit MainWindow(); }; mainwindow....
1
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1answer
85 views

Prepare a cross-platform QT C-wrapper class for unit testing and mocking

The situation I recently started a cross platform QT project (arm, linux-x86, windows) that aims to interact with CAN-Bus hardware. I want to learn and get used to unit testing from scratch as good ...
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0answers
257 views

Drawing rectangle on a video with mouse in QT

I created a where I select a video using QOpenFileDialog and play the video on QGraphicsView. After that I select an area on ...
1
vote
1answer
67 views

Simple Qt GUI to list user-created categories and tasks

I've written a very simple program using Qt that I intend to continue working on as I continue learning C++ and Qt. I'm mostly wondering about my general code and comment style, specifically in terms ...
-1
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1answer
72 views

How to use a predicate to create or filter vector [closed]

I have function which returns a vector or strings (values from an sqlite3 table). For each of those strings I need to generate a Qt Checkbox, if it does not exist yet. My first version looks like ...
3
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0answers
174 views

PyQt layout wrapper with indents

As I'm sure a lot of you are aware, the layout files generated for Qt look quite horrible. Maya had a wrapper that let you indent each widget when building manually, so I decided to have a try with ...
4
votes
1answer
116 views

Age in hours calculator

I've written a small script, which calculates hours since the birth. I ask use about how old they are in years, months and day. I show them approximately how many hours they have lived. Below is the ...
1
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0answers
155 views

Alt-Coin Wallet QT Project for Mac OS-X

I was told my QT Project file is a hot mess. I'm returning to C++ after many years of doing Java and I'm really new to QT. I would like someone familiar with QT Project files to give my code a once ...
2
votes
1answer
103 views

Concurrent access to data with QReadWriteLock

Using Qt, I've got this code in order to protect access to some shared data between threads. I'm pretty sure the idea is correct, but I don't know if RVO and/or RAII could potentially screw the ...
2
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0answers
581 views

PyQt frame which changes color with child focus

I am working on an application that has various "panels" contained within splitters. I wanted the panel border to change color when one of it's children gained focus. Here is a simple example of the ...
8
votes
1answer
236 views

Simple postfix calculator app

Premise I'm writing a simple postfix calculator app in C++ using the Qt (5) GUI framework. This is simply for practice with software development. Visually, my calculator looks like this: The ...
5
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1answer
1k views

Plotting a GPS track

I have performed this test and they have not given me a conclusive answer (they really have not given me any response). I have to paint a graphic, do you think the implementation is correct? Is there ...
12
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3answers
684 views

A moveable QScopedPointer, or a Qt and std cross-compatible unique_pointer

I'm a hobby programmer, so I've never been through a code review before (online or offline). That said, here goes: Background I use Qt extensively but have long wanted ...
8
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2answers
3k views

A simple Fraction class

My code seems to work fine. However, I feel like it is a bit too long (fraction.cpp). I really want to create simple, readable, and efficient code. Sample Run: Here is the fraction.h file: ...
2
votes
1answer
79 views

Dijkstra implementation for large graphs

I am implementing the Dijkstra algorithm for a large graph (40k nodes, 100k arcs). For shorter paths the searchtime is under a second for larger ones (from one end to the other) it takes quite some ...
2
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1answer
628 views

QT - Class For Connecting to Mqtt Broker With QMqttClient

Task: Class for connecting to a mqtt broker using QMqttClient and getting notified on connect and ...
4
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0answers
115 views

SoundBoard in C++ Using Qt

I've been working on a soundboard software for tabletop games audio immersion in C++ using Qt. The software consists of 2 tabs who provides to a game master a set of individual sounds or scenes to be ...
4
votes
1answer
73 views

RubberDucky Detector

RubberDucky which will look like a regular usb drive but it will act like a keystorke device. This C++ program will help you to find whether the connected device is actually a USB device is actually ...
2
votes
1answer
2k views

QT/QML scripting and property binding approach

I'm asking your help to understand it the following code does something that should really be avoided. The application I'm currently working on is an embedded HMI for a process controller who shares ...
7
votes
1answer
209 views

ApiClient with http communication in Qt

This is my first code review request on this page. I tried to simplify my ApiClient as much as possible. The full version is also on GitHub. I thought very long about how to design the API client ...
2
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0answers
896 views

Visualization of sorting algorithms

I recently started to learn Qt framework and decided to create an app to visualize the sorting algorithms(for this moment there are 5 sorting algorithms). I just want to know if I'm doing everything ...
1
vote
1answer
2k views

Multi-client TCP server with a thread for each client and DB connection pool

I'm creating a Qt TCP (with SSL) server to which multiple clients should connect and use the DB, and this is the main task. So, I think I can use this architecture: each client has its own thread, and ...
3
votes
2answers
302 views

Using QXmlStreamReader to read configuration file of key-value pairs

Background The following XML snippet contains configuration parameters for our application in key-value pair manner. (Despite using INI files for such purpose may be better, I have to use XML files.) ...
4
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1answer
175 views

C++ with Qt - Conversion of angle in radians to DDD°MM′SS.FFF″ string

I had to write a function which takes an angle in radians and precision N as input and returns a string representation of its magnitude in the format DDD°MM′SS.FFF″ ...
1
vote
1answer
952 views

Use callback style to start a worker thread and receive result in Qt

After using JavaScript for a while, I think callbacks are pretty good for asynchronous programming, but I haven't seen anything similar in C++. What I want to achieve is to start a worker thread from ...
2
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0answers
181 views

asyncio with live update and abort capabilities

This is my first shot at asyncio. I'm looking for any pointers you might have. Especially: Are there any race conditions? This code doesn't scale as expected. In ...
1
vote
0answers
255 views

PySide: Feedback progress of task back to GUI from QThread

I have some PySide GUI application which is capable of executing long running tasks. The targets of my application design is to put the task execution to a thread to not block the GUI (e.g. for ...
2
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0answers
582 views

Improved QML Settings

Qt.labs.settings 1.0 module from QtDeclarative (depricated) allows to use QSettings to make ...
2
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1answer
1k views

Better QOpenGLWidget by delaying GL code to initializeGL with lambda functions

When I am writing OpenGL applications with the QOpenGLWidget class, deciding what code goes into the initializeGL function has ...
2
votes
1answer
272 views

Logging class in Qt library for foreign language calls

I have a small C++/Qt library that interfaces with an application in another language (so interfacing must be performed using primitives, notably pointers to Handler...
5
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1answer
2k views

Safely and elegantly handling UNIX signals in Qt applications

When you search the web on how to gracefully shut down your Qt application when receiving SIGTERM, you are invariably directed towards this informative, yet ...
5
votes
1answer
503 views

Board game in c++ using qt

I have been working on a board game in c++ using qt. The game cosist of four palyer with four different colors. I am looking forward to improving my board looking. This is all working fine, but I ...
3
votes
1answer
148 views

Sharing file descriptor between an under-privileged and a privileged process (using C++ and Qt)

This code is part of my Google Summer of Code project. It will be used in a file manager to provide file management in a root-owned directory. As the title suggests this will be used to share file ...
0
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2answers
1k views

Open text file and read data to an arrayfire array using Qt and C++

I'm currently writing a C++ project with a Qt GUI and would like to read numerical data from user-selected text files through QtFileDialog::getOpenFileName. There ...
3
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0answers
115 views

Trait class for a serialization framework

In a current project I have implemented a small non-intrusive serialization framework based on type traits. The generic trait template looks like this: ...
0
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2answers
230 views

C++ QThread for Oscilloscope/LAN communication

I have written a Class for LAN communication using an Agilent Oscilloscope. I would like you to your opinion what I can change with this code, so it work without problem. I would like to know your ...
3
votes
0answers
934 views

Send Opencv::Mat image from Qt application to HTML client, using websocket

I wrote an application in C++ using Qt 5.7, basically is a websocket server, using qwebsocket for this, capable to send an image elaborated with OpenCV to an HTML client. In order to do this I encode ...