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  How to create the plugin of MYSQL for Qt
  • BlackStar  

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  @flydragon Do not duplicate posting because you do not get an answer immendiately. [edit:koahnig see https://forum.qt.io/topic/82629/why-qsqlquery-exec-exit-failed ]
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  Reporting inappropriate content on the forums
  spam • • Eddy  

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  Thank you for the report. I have banned the user, which got rid of the spam posting. Not a loss, as this user did not post any other content on the site. Just deleting this one posting was not possible. Thanks for reporting this.
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  UNSOLVED Random Qt Questions for First Application Release: QThread blocking and UTF-8 labels
  qthread newbie utf-8 • • squinky86  

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  UNSOLVED Coding a web scraper - I have a big question
  • Alvein  

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  Unfortunately I really have no idea. I've never even looked at the documentation of that module, I just know it exists (for the mentioned purpose). Hopefully someone with an idea is going to pick up the thread and give you a decent suggestion.
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  UNSOLVED Proper way of creating an interface with a while-loop in a QThread
  • prex  

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  @prex said in Proper way of creating an interface with a while-loop in a QThread: I'm not sure if I should just call my service functions in the Worker as a class method, or make a connection. Is there any difference? Since your controller is in the GUI thread (assuming there you created it), and the worker is living in another thread you shouldn't call stuff on the worker directly. If you decide to do so, you must be very, very careful and synchronize the threads manually. And the second thing is that I will need a second "WRITE" function (setter fct), which sets my m_temp variable and emits NOTIFY. If I would connect to WRITE from my Worker, this would call my service slot again, although it should just update the GUI. You need to elaborate a bit, are these properties you have in the controller important for the worker to operate, and how? Is the worker going to modify them? Is the worker only going to report changes to them? Are they supposed to be both written and read to respectively from the worker thread?
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  UNSOLVED I can't fit image in Qlabel
  • hernancrespo89  

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  UNSOLVED Query regarding QSqlTableModel and delegate
  • sunilpkd  

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  Hi, What are you doing within your delegate ? By the way, you should rather use QStyledItemDelegate.
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  UNSOLVED Change Highlight item's color if a QListWidgetItem
  • qt.1234  

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  Hi, Please take a look at the stylesheet reference for QListView. It shows how to customize several aspects of that widget.
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  UNSOLVED QMySQL , can't build it..
  • U7Development  

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  According to docs i need to install mysql web community and install it specially C Connector 6.1, right, that is installed successfully. The required files are present on my machine : <MySQL dir>/lib/libmysql.lib <MySQL dir>/lib/libmysql.dll <MySQL dir>/include/mysql.h Then i execute the next commands: cd %QTDIR%\qtbase\src\plugins\sqldrivers qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/include" MYSQL_LIBDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/lib" nmake sub-mysql nmake install Command 1 is OK Command 2 prints out a configuration summary wish says that MySql driver is set to "no" (i don't know if it is really fine) Since i don't own nmake, i need to switch to mingw32-make: Command 3 get this error: mingw32-make: *** No rule to make target 'sub-mysql'. Stop. Either i can not finish well this command, i have not continued to execute command 4... Edit : I noticed i can use ODBC to connect to MySql too.. is there any difference between this and native plugin?
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  SOLVED setPixmap behaves strange
  • hernancrespo89  

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  @SGaist I didn't know that. Thanks a lot
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  UNSOLVED Q_DECLARE_SMART_POINTER_METATYPE type restriction
  qvariant smart pointers • • Joel Bodenmann  

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  From a short look at the code without understanding the whole stuff I would guess that internally there is only a QObject pointer is stored. So it must be a QObject to track the lifetime.
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  SOLVED mac: attempt to add "QT += sql" causes build error?
  • davecotter  

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  Hi, You can use install_name_tool to modify the the plugin's linked libraries path.
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  UNSOLVED Why same images have different brightness in QtWidgets app and standard Preview app?
  • stephen96  

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  I think it's a matter of color space . In Preview you can choose a color profil. Have a try with sRGB, it could match because it looks darker. Also, in Preview you can know what is the embedded image's profil in the Inspector window.
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  UNSOLVED Profiling using Qt Creator on macOS?
  • agarny  

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  @SGaist said in Profiling using Qt Creator on macOS?: Please show some patience and allow 24 hours before bumping your own thread. This forum is run by volunteers who may not even live in the same time zone as you. Yes, I know. It's just that, being based in New Zealand, if I post/email something at the end of my day then I normally get a reply at the beginning of the following day (since most people are based either in Europe or in the US), but... I do take your point. As for your question, if memory serves well, you should take a look at the Instruments application which comes with Xcode. Thanks, I am going to look into it.
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  UNSOLVED macOS: how to show NSPanel after a qdialog has been closed?
  • gvanvoor  

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  Hi, You need to provide an MRE so people can test your code on their own to help debug it.
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  UNSOLVED Is it possible to change the name of the handler function or no?
  • stretchthebits  

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  @stretchthebits said in Is it possible to change the name of the handler function or no?: How do you connect the button to the slot? https://doc.qt.io/qt-5/signalsandslots.html
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  UNSOLVED Detecting widget resize done by mouse
  • Black Imp  

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  You have a point (I have edited my previous answer). The technique works well for loading settings when signals and slots are involved. I encourage you to try it for your use case. As for the sequence of events you have one thing wrong, the show method schedules an event to show the widget however it won't happen until the QApplication event loop starts. The same goes for the QTimer at the end of the constructor. The timer itself needs an event loop and thus the timeout will only happen after the constructor has ended since the event loop has not yet started.
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  This topic is deleted!
  • Guerrian  

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  UNSOLVED how to get selected items of a QTableWidget from eventFilter?
  • Ripley  

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  @Ripley said in how to get selected items of a QTableWidget from eventFilter?: QStandardItemModel *sModel = new QStandardItemModel(this); You don't want to create a new model. You want to use of find the model your QTableWidget is showing and put the value in there.
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  UNSOLVED How to develop test automation using python script (Includes GUI) for the application developed in QT creator(.exe file)
  • reddipradeep.embd  

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  Hi, You can embed PySide2 with your application like described in this blog post. Out of curiosity, why not use the QtTest module ?
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  SOLVED QCoreApplication console application does not output with Valgrind
  • Guerrian  

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  @Guerrian said in QCoreApplication console application does not output with Valgrind: I forgot the slash correct :)
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  UNSOLVED Simulate mouseMoveEvent not working QT
  qmouseevent • • prasanth  

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  Did you find the solution please ?
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  UNSOLVED QWidget::setStyleSheet() breaks cascade inheritance
  • JonB  

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  @sierdzio Hi there, thanks for replying :) No reparenting, nothing going on in code like that (bit I will recheck tomorrow). The layout is designed from Creator, not manipulated in our code. Nothing like palettes or special widgets. Yep, I did dynamic properties in my previous project. Not at issue here. I have done a lot of CSS for my sinds, so I do know what it's all about. So can we be clear, please? Are you withdrawing your: If you want to stop subwidgets from inheriting the style, call setStyleSheet("") on widgets which should have default style sheet. I have not seen Qt says it would do that. Unless it says it does I would not expect it to --- it would break the simplest case of defining a global set of styles and then occasionally doing one thing on an element if that cancelled all inheritance. My "standalone" tests do not reveal such behaviour. Yet my problem cases are behaving as though that does happen, in unrepeatable circumstances. That is why I ask. Something seems to be going "if such and such an element has any stylesheet of is own, cancel inheritance from its ancestors at this point and down to descendants". When it should not. As I have said elsewhere, it may have something to do with QTabWidgets & QScrollBars. I have already discovered that "containers" like these do not behave as one would expect for inheritance, I may make a separate post tomorrow showing that.
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  UNSOLVED Real-Time Plotting
  • MaxBec  

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  There was a similar question in another thread about UDP and passing to QML in that case. I would probably recommend doing the same thing. Create a handling class for the UDP anagrams and massage them until you have the data you need your UI to display. When that is ready expose the data through a property or signal to notify the UI it’s time to redraw the chart. In my case I got UDP data over a socket from an MCU in 1, 10 or 100Hz intervals. I didn’t stumble uponany realtime problems there. But that all depends. What is real time? What hardware etc you have. What is time even? 😉 It might also be different requirements on the UI frame rate and the update rate on the UDP data. 60FPS for a UI is nice, but refreshing “data” 60 times per seconds might be impossible to comprehend.
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  UNSOLVED Problem with rendering the japanese and chinese language in html file using QTextStream
  • msah  

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  @msah said in Problem with rendring the japanis and chinese langugae in html file using Qtextstream: QByteArray string = "形容動詞"; This is wrong. QTextStream is for QStrings, not QByteArray and I'm pretty sure this is not displayable at all. Also make sure that QTextStream is using the correct codec you're expecting.
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  SOLVED How to set up a slot for a console app using QCoreApplication?
  • Guerrian  

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  @Christian-Ehrlicher Yes i saw that in some of the samples but i consider it a hax :) ps. I love your new Tag !
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  UNSOLVED signal QMdiArea::subWindowActivated(QMdiSubWindow *window) emitted two times while switching
  • Akhendra  

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  Hi Switching between subwindows only fires one signal for me. However, on startup, it does get 2 but not while running. ( the 2 at start up is as expected as first no 1 is active then, 2 comes and made active ) But after that -Only on pr switch. using this test code. int main(int argc, char *argv[]) { QApplication app(argc, argv); MainWindow window; QMdiArea *mdiArea = new QMdiArea(); window.setCentralWidget(mdiArea ); imagesubwindow *subWindow1 = new imagesubwindow(); mdiArea ->addSubWindow(subWindow1 ); QObject::connect(mdiArea, &QMdiArea::subWindowActivated, []() { static int cc=1; qDebug() << "subWindowActivated = " << cc++; }); imagesubwindow *subWindow12 = new imagesubwindow(); mdiArea ->addSubWindow(subWindow12 ); window.show(); return app.exec(); }
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  UNSOLVED QSqlDatabase: QMYSQL driver not loaded
  • nn26  

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  Or by simply copying the needed dlls (e.g. by searching them with Dependency Walker) to the application directory: https://doc.qt.io/qt-5/sql-driver.html#qmysql
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  UNSOLVED Split string with space but ignore when in quotes
  • Maaz Momin  

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  @Maaz-Momin split also allows for regular expressions https://doc.qt.io/qt-5/qstring.html#split-3 Just a matter of regexp black magic googles black magic: https://stackoverflow.com/questions/9577930/regular-expression-to-select-all-whitespace-that-isnt-in-quotes
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  SOLVED QtVirtualKeyboard over my widget
  • addebito  

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  @Pl45m4 WOW! This is exactly what I was looking for. Thank you very much!
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  UNSOLVED mingw32 error 2
  • Ozuu  

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  @Ozuu Strange. But according to the compiler it has to (directly or not) included somewhere. And the way that include is being written has its path wrong. Unless there is something I don't fully understand about the compile process. Maybe more experienced members of the forum have some other thoughts on this - but I'd go through search through files for the include and check the paths in those includes.
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  UNSOLVED How to send and receive QVariantMap with pyqt5 QDatastream ?
  • RahibeMeryem  

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  SOLVED How to create a console application with command line arguments in Qt?
  • Guerrian  

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  @Guerrian Hi, there is a QCommandLineParser-class. (https://doc.qt.io/qt-5/qcommandlineparser.html#details) Have a look at this. Edit: Damn, I'm typing too slow... :) @J-Hilk
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  SOLVED How to emit a signal to all QGraphicsRectItem
  • addebito  

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  OK, thank you all very much. Yes, my derived class is something like that, because I need the signal/slot mechanism class VTGraphicsPin : public QObject, public QGraphicsRectItem I think I'll send a signal to an external class (manager) because it has a container, and iterate on all objects to check what "pin" should have the same color.
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  UNSOLVED Any solution ???
  • Akhendra  

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  @Akhendra you can answer to your old threat, and even pump it up after a time. But give it some time as well (24h at least) this is a user based forum people answer when they can and when they have the time. <closed>
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  UNSOLVED no SSL support on Windows just for few users...
  • mbruel  

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  @mbruel Hi ,if you use mingw or mingw-w64 you can compile openssl with it from the sources, and then compile Qt from the sources, with the support of openssl (option in configure of Qt)
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  UNSOLVED Undock, dock & drag using tabs Just like in a browsers
  qdockwidget • • Rizwan94  

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  https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System LGPL license
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  UNSOLVED Creating BLE & Bluetooth Classic in a single app with live plot?
  bluetooth bluetooth low e • • TUStudi  

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  Hi and welcome @TUStudi Yes should be possible. Do you have any experience in Qt or is it your first project? @TUStudi said in Creating BLE & Bluetooth Classic in a single app with live plot?: So for example in the GUI the user can choose between Bluetooth or Bluetooth low energy (one single application, not 2), than after selecting, the App starts to discover devices, then connecting to a device and starts to transfer This is included in Qts several QBluetooth...-classes. You can choose between 'normal' and low energy profiles. (radiobuttons or something like that to switch BT modes in GUI) "All you need to do" is integrating your bluetooth connection stuff to your GUI logic (menus, buttons whatever you want to do) and pass the data you recieve via bluetooth to a QChart (or you even use QCustomPlot, see here, or QWT. Depends on the type of data you recieve and how you want to visualize it) Qt & BT examples / Tutorials Qt BT LE QChart @TUStudi said in Creating BLE & Bluetooth Classic in a single app with live plot?: But my project goes a few steps further. In which way? If you build an app from scratch, you can do whatever you want
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  UNSOLVED How to always show my qt widget on top of my parent window but also on top of parent's child widgets?
  • lachdanan  

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  @JonB thx a lot you are right I should have mentioned Python but it will be the same as dynamically calling it. I will give it a try when I go home. Here the last reply basically explains the issue I had with raise: https://stackoverflow.com/questions/2463125/keep-widget-on-top-in-qt There is a much larger child widget that goes in front of mine when it receives focus. This widget is where you do most of the work so it's normal. Mine is supposed to be a monitor you just look at from time to time like cpu monitor. I just want it to always be on top of this app.
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  UNSOLVED Project tree changes when switching from debug to release mode
  • davidesalvetti  

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  After a lot of attempts I manage to build my project in release mode using a workaround, but I don't really know if it's something safe. In build settings->Release I disabled the flag "Enable Qt Quick Compiler" since it's disabled also in release mode. From what I can see the application is working correctly and is not giving me any problem.