Brainstorm

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  Unsolved need ideas for list/table implementation
  • mzimmers

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  You can connect &QThread::finished insetad of &Widget::quitButtonPushed to &QApplication::quit for the application to wait for the thread to finish before closing down

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  Unsolved Which system do you recommend for cloud based realtime database?
  cloud iot realtime database • • ideadesigner

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  The most compatible with qt is GE Predix (https://www.predix.io/) - https://github.com/IndeemaSoftware/QPredix

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  Unsolved GPL licensing and Contributor Licensing Agreement
  • Znalazca

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  Hi, and welcome to the Qt dev net!

  @Znalazca said in GPL licensing and Contributor Licensing Agreement:

  Recently I finished a project. I want to publish it as open source under GNU GPLv3 license. I want to be an owner of whole source code including possible future contributions of other people.

  Do you want to be the owner, or just an irrevocable license to use contributed code?

  With the Qt Project, the contributor retains copyright of the code. The contributor just grants the Qt Project the right to use the code as they see fit.

  I suppose that there may be some 'universal' CLA texts written by lawyers for individuals but I haven't found anything.

  Could you recommend me some CLA text for my purposes? I appreciate any help.

  I'm not aware of any such universal CLAs either.

  If you're interested, here is the Qt Project's CLA: https://www1.qt.io/contributionagreement/

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  Solved Distributed Database Maintenance
  • VRonin

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  Hi,

  This PostgreSQL wiki page about replication and clustering might be a good starting point.

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  Solved Is it a good practice or good idea to have a stock of actions?
  good practice design pattern • • remizero

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  Thank you very much for your answers, because they have been very useful to solve a problem within my application.

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  Unsolved Controlling UVC Complaint camera using Qt(Windows)
  • Kira

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  This topic is deleted!
  • Kira

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  Solved QAbstractItemModel::dataChanged what would you prefer?
  • VRonin

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  @JKSH said in QAbstractItemModel::dataChanged what would you prefer?:

  I'd just choose the option that requires simpler code (which I think is Flavour 1)

  it's actually flavour 2 in my case as I would have to check that the two indexes are one next to the other while I don't care using flavour 2

  @Christian-Ehrlicher said in QAbstractItemModel::dataChanged what would you prefer?:

  When you look at the default implementation you will see that the second one is better:

  Ok, this is a show stopper. I did not realise sending topLeft!=bottomRight (often) triggers a repaint of the entire view. This makes flavour 2 strictly better

  Thanks everyone for your insight

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  Unsolved What exactly is McCabe cyclomatic complexity?
  • reggie

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  The only adequate metric of code complexity is "WTF per minute" :)

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  Unsolved Using Google Maps with Qt/QML
  • DBoosalis

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  Unsolved Working on my First GUI Qt program
  • Thatboy

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  Hi and welcome to devnet,

  What kind of tutorials are you thinking about ?
  There are already several in Qt's own documentation.

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  Crude Speed Camera
  • webzoid

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  @Pablo-J-Rogina thanks for the link - very useful indeed and a very good starting point.

  Ultimately I'm going for a fully-integrated solution which will have its own waterproof housing and could potentially be Wi-Fi linked to a home network (for email notifications, web access, etc).

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  This topic is deleted!
  • Lhgckhhtd

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  Unsolved How would a QFileWriter class work out?
  • jamieyello

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  It doesn't look like QDataStream has an option to disable the writing of metadata through << operators when using template objects. writeRawData() requires a length field, and I don't believe it's possible to recognize that with a template object. The simple workaround would be to make the template method private with some secondary overload methods that would accept all the different kinds of data I plan on working with and then detect the lengths of the files, but I feel like that would defeat the goal of what I'm going for here.

  I could remove the metadata manually. Looking at the resulting files through a hex editor, it seems simple enough to spot. Not preferable, not very optimized, having to open and close the file twice.

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  Unsolved Tomtom linux
  tomtom linux custom • • GhostWolf

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  @GhostWolf said in Tomtom linux:

  The reason I wanted the TomTom was because I just have it laying here, and the programm doesn't have to be fast. The only thing it needs to do is to send data if I press a button on the screen.

  As @Wieland already said, most likely nobody here can help you with this. So even if it's possible (from hardware side) to do what you want, you're on your own.

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  Solved implementing a dynamic display
  • mzimmers

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  Just as a note. you can add as many forms as you like and
  have them auto created like mainwindow is.

  P.s.:Hi

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  Unsolved Any good ebooks or vtm for QT training? preferebly newer versions..
  • NatK

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  Hi
  If you mean free with ebooks - then not any i have seen. Most cost money.
  http://wiki.qt.io/Books
  There tons of video on youtube though.

  I'm not sure why you blame Qt for your toolchain installation woes.
  It is your responsibility as with ANY c++ framework.
  Besides, Qt company is FORBIDDEN by microsoft to include visual studio directly.
  And considering the amount of toolchains that exists, it would be impossible task to
  include prebuilt Qts for all combinations of CPU/platform and bitness.
  But i agree that cross compiling is a huge pain and many of us complete ignore it and
  just use virtual machines to build natively. Sadly doing so for android is not an option.

  Merry Christmas :)

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  Solved Generating docx / Communicating with Word add-in
  • Asperamanca

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  Thanks, the two of you. Document creator sounds like what I need. The lighter, the better.

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  Unsolved implementing 3 dimensional array (or other technique)
  • mzimmers

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  @mzimmers Yes, you don't have to

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  Flux like architecture with Model/View
  • Larvae

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  Unsolved Qt ver not showing up?
  • Archy

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  Basically Ive got 2GB on my SSD and 2 other harddisks (2tb ea) one is filled the other is completly clean so I installed it on the completly clean one but I can't use the maintainancetool beacuse my SSD doesn't have space for temporary files.

  Thats my problem :/

  Edit: found a way to clear space I'll update when its done! ^^

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  Unsolved BROWSER INTERACTION WITH QT
  • ADITYAGUPTA

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  Unsolved Install Qt 5 on Ubuntu - problem - ~/.local/share/applications
  • Andrej

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  You find command doesn't go through all of your machine just the curent folder, likely you home directory.

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  This topic is deleted!
  • Federal Error Design

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  Solved yet another beginner's design question
  • mzimmers

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  @kshegunov got it...thanks for the clarification.

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  Unsolved Custom Graphs with Animation
  • ajaxcrypto

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  If you want to use D3.js without rewriting it in other language, your first options are either to embed browser, or use QML. Sure you can also run JS code in plain QJSEngine and add your objects there, but that's going to be more work

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  Unsolved Need QTMultimedia but cant find it?
  • MrYellow

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  Qt 4 has reached EOL long ago. Please consider upgrading to Qt 5

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  Unsolved how can i create a chat app like telegram in Qt for mobiles
  android network socket mobile app deve c++ • • Qjay

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  Thanks everyone for insight . I have some idea now from where i should start .

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  Unsolved Swipe Gesture not working.
  • Isles

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  @raven-worx
  Yes, I'm running the unmodified example code.

  I start the application from Qt Creator. You are correct there are options to disable Gestures via command line parameters. But options to disable like "no-pan" or "no-pinch" or " no-swipe" must be explicitly set to disable them. Since I'm running from Qt Creator, I haven't set any of these options. Hence all three gestures are enabled.

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  Unsolved Java in Qt
  • WhatIf

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  This library looks good as well: https://github.com/MSardelich/CJay

  Found by simply typing "call java from c++" into Google

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  Unsolved Snapshot Testing
  • benlau

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  Just published an article about how to use Snapshot Testing with TDD for automated GUI testing

  https://medium.com/e-fever/qml-snapshot-testing-with-tdd-aba81441c52

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  Solved another beginner design question
  • mzimmers

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  @mzimmers
  In this kind of scenarios, you should use timer to call a function periodically. NEVER EVER create a while-loop insider your GUI, this will freezes your app.
  A suggested solution is

  // dialog.cpp #include "dialog.h" #include "ui_dialog.h" #include <QTimer> #include <QDebug> Dialog::Dialog(QWidget *parent) : QDialog(parent), ui(new Ui::Dialog), runFlag(false) { ui->setupUi(this); QTimer *timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(onWorkerThread())); timer->start(1000); // delay } Dialog::~Dialog() { delete ui; } void Dialog::onWorkerThread() { if (runFlag){ qDebug() << "Worker Thread is running..."; }else{ qDebug() << "Worker Thread is NOT running..."; } } void Dialog::on_ActivateButton_clicked() { runFlag=true; } void Dialog::on_DisactivateButton_clicked() { runFlag=false; } //dialog.h #ifndef DIALOG_H #define DIALOG_H #include <QDialog> namespace Ui { class Dialog; } class Dialog : public QDialog { Q_OBJECT public: explicit Dialog(QWidget *parent = 0); ~Dialog(); private slots: void onWorkerThread(); void on_ActivateButton_clicked(); void on_DisactivateButton_clicked(); private: Ui::Dialog *ui; bool runFlag; }; #endif // DIALOG_H //main.cpp #include "dialog.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Dialog w; w.show(); return a.exec(); }

  The GUI is

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  Unsolved Licenses craziness!
  • mbnoimi

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  @SGaist said in Licenses craziness!:

  What happens usually is that developers use a different version of the database system that was used to build the Qt plugins hence the potential need to re-build the corresponding plugins.

  This isn't an excuse because I don't face any problem when I use commercial products (as I mentioned before ex. Delphi). Do other companies make a magical solution for this issue?! Of course not.

  If you want to avoid that, then you should maybe consider using ODBC. You have to take into account that many of the database system you are talking about have several versions supported in parallels with sometimes different features. Do you expect Qt to provide a pre-built plugin for each of these versions ?

  Since I knew Qt I couldn't use any Qt plugin (specifically SQL plugins) by default because I always need to rebuild it from scratch (the old Qt binary distros didn't include binaries for SQL plugins except SQLite)

  Because Qt can be used under LGPL/GPL doesn't mean its development is free nor that there are limitless hardware to build and produce the pre-built release nor thousands of developers working on it every day.

  I understand your frustration regarding licenses but it looks like you don't realise the jungle that it is. Because a product is free it doesn't mean you can do whatever you want to with it.

  This issue not related to open source version Qt, the commercial version of Qt has same problem!

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  Solved proper design for first project
  • mzimmers

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  Yeah, that was basically it. When I stitched together the examples from above, I neglected to notice that my worker object had two timers declared, and I wasn't consistent on which I used.

  Works now. I've tested multiple starts and stops, and verified that the "finished" signal works, too. I do believe I have a functional example. I also modified the program so the worker passes the value to the widget for display.

  So, to summarize what I've learned here:

  run at least two threads: one for the UI and one to do work. This prevents compute-intensive tasks from blocking the UI updates. create a class for the worker, and instantiate an object in main(). use moveToThread to move the worker object to another thread. make your worker interrupt-driven (work depends mostly on signals from UI). use the arguments in the signal/slot routines to pass data.

  I think I have a basis for reasonable design now. Thank you to everyone who participated in this.

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  Unsolved AR Application with sensor tracking
  imu dead reckoning • • jweber

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  Unsolved Having trouble linking QT libraries in Visual Studio 2015
  • daeto

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  @daeto
  did you specify an absolute or relative lib path in the project's AdditionalLibraryDirectories property?
  What libs did you add to the project's AdditionalDependencies property?
  And what does the errors exactly say?

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  Unsolved Microsoft Fluent Design System: How close can we get to match it?
  • QtBit44

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  Not even aware of "Fluent Design" tech/product name is until seeing your post... still not really knowing.
  What I can gather it's a Microsoft heavy gloss marketing attempt at 3d interface / Ui?

  Have you seen:
  https://blog.qt.io/blog/2017/05/24/qt3d/

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  Solved Questions of the LGPL with QT
  • gangerM

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  @tekojo

  Thank you for your detailed answer! This really helps me in the right direction! :D
  Most things are around what I expected them to be, which is great.
  I'll mark this thread as solved, thanks again for the help!

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  Solved Static Compile w/o Commercial License
  • oPryzeLP

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  @Konstantin-Tokarev Thanks, I see it now.

  https://softwareengineering.stackexchange.com/questions/312758/does-providing-object-files-satisfy-lgpl-relink-clause

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  Unsolved Is it legal?
  • bask185

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  @Konstantin-Tokarev that's exactly what I meant, thanks for the clarification.