General and Desktop

@dziko147 said in How to cross-compile QT App on RPi3: I would like to use the kernel image generated by buildroot not Raspbian distribution What did you add to your custom buildroot image? You must, at least, have add QT5 support.

@jsulm @Christian-Ehrlicher Thx. Issue solved. Everything works fine for me now. Example published here

Threads are a minefield. For example, in your code if this gets deleted before the other thread finishes your program would crash

@jsulm thank you

@sarthak031 You are using this example (https://github.com/Gawhary/BLE-Tester), aren't you? Where exactly the error occurs (use debugger)? Is your device BLE ready? Test your connection using the official BTLE examples https://doc.qt.io/qt-5/qtbluetooth-le-overview.html#using-qt-bluetooth-low-energy-api https://doc.qt.io/qt-5/qtbluetooth-lowenergyscanner-example.html

@suslucoder have you tried setSelectionMode(QAbstractItemView::SingleSelection); on your table widget? Seems like you try to implement behaviour that's already there. https://doc.qt.io/qt-5/qabstractitemview.html#SelectionMode-enum https://doc.qt.io/qt-5/qabstractitemview.html#selectionMode-prop

@J-Hilk I i have done the same thing as you described. However i deleted pro.user file and build folder . Thanks for the answer. There are some hidden files which i copied. So error is from that.

Hi and welcome to devnet forum The best start for you would be using a Qt creator installation with appropriate Qt lib version. For a starter Qt version 5.15 for the Qt libs is better. There are a couple of example projects with SQL available. Try those.

@Dvassily I think it would be interesting for others what the problem was. And don't forget to mark the thread as solved then.

Thanks a lot! I've made what I planed[image: f010deb3-9d56-49aa-964d-086cd1d6b463.png] Now I just need to fix some minor bugs

@lagodolio said in Strange qt pushbutton behavior: @jsulm Hello... I changed my mouse and no more problems occour! LOL :)

@Christian-Ehrlicher I see, thanks so much.

@Alpkan It's not, changeEvent has its root in QWidget not in QObject you can't simply name a function changeEvent in a non QWidget based class and expect it to behave like a QWidget. I think you want to notify your QObject based classes that a new language has been set and they should change their strings, right? You'll have to find a way to notify them yourself. There are countless ways, but - afaik - no ready made Qt ways

@cdecde57 There is no need for sender(). You're already using a lambda as slot, so simply capture the sender: connect(newConnection, &QTcpSocket::readyRead, this, [newConnection, this](){ reading(newConnection); });

@cerr Check out QComboBox's stylesheet options: https://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qcombobox The drop down/ pop up menu is a QAbstractItemView which can be customized with stylesheet as well.

@nagesh Haha :boom: I knew it was something along these lines: "select combo box and expand horizontally in right direction it should occupy the empty space right to it" Shame on me and awesome! Thank you very much! lol I never asked that question, right? :D

@nagesh Got it! This is what I need. To be more precise, QOpenGLTimeMonitor () helped me. Thank you for your help.

Hi What is the actual error ? #include <QOpenGLVertexArrayObject> should do it.