General and Desktop

@artwaw That's absolutely not going to work. Widgets shouldn't be moved to other threads. All ui code needs to run in the main thread. @inforathinam Qt's signal/slot connections do (by default) a runtime check at the time of signal emission. If both sender and the receiver live in the same thread then a direct connection is performed i.e. the slot is invoked in the same thread as the signal was emitted in (it's more or less equivalent to a direct function call). In your case that is exactly what's happening since sender and receiver are the same object (MainView). What you want though is to make a queued connection i.e. the slot to be invoked in the main thread, no matter which thread emitted the signal. Since your object is both sender and receiver Qt can't make that deduction automatically, so you need to help it with an extra argument to the connect() call: connect(mainViewInstance, &MainView::signal, mainViewInstance, &MainView::threadEnded, Qt::QueuedConnection); This way the slot will be called in the receiver's thread (I'm assuming MainView instance is a QObject that was created in the main thread).

@QtBit44 not sure if I understand you correctly. But you should be basically able to click on to any wiget in your layout and open a dialog with the right mouse key. There you will find delete. You be able to mark also any widget in the right upper pane and use the delete button. [update: also there you have to use the right mouse button and select delete]

@IslamMohamed Hi and welcome to devnet forum It is better fro you to start with a new post rather than steeling an old one. Concerning your question you can check out the QWebView example it gives you already a compilable and runnable example. Typically the example are the best start into new topics with Qt.

Thanks all for your contribution

@jsulm thanks for you reply! it is work! thanks again!

@VRonin said in Qfile and Qresource problem: Did you add Dictionary2.csv.txt to the qrc file? Nope, did so now, thank you.

@Wieland Hi, in relation with this answer I would like to replace the import "." with something like import MyComponents 1.0 I've found this documentation: http://doc.qt.io/qt-5/qtqml-modules-qmldir.html Where it's said: //Style.qml with custom singleton type definition pragma Singleton import QtQuick 2.0 QtObject { property int textSize: 20 property color textColor: "green" } // qmldir declaring the singleton type module CustomStyles singleton Style 1.0 Style.qml // singleton type in use import QtQuick 2.0 import CustomStyles 1.0 Text { font.pixelSize: Style.textSize color: Style.textColor text: "Hello World" } So in my case I did: //EnumerationCustomType.qml with custom singleton type definition pragma Singleton import QtQuick 2.7 QtObject { readonly property int one: 1 readonly property int two: 2 readonly property int three: 3 } // qmldir declaring the singleton type module MyComponents singleton EnumerationCustomType 1.0 EnumerationCustomType.qml // singleton type in use import QtQuick 2.7 import QtQuick.Controls 2.0 import MyComponents 1.0 ApplicationWindow { visible: true width: 640 height: 480 Column { Text { text: EnumerationCustomType.one } Text { text: EnumerationCustomType.two } Text { text: EnumerationCustomType.three } } } But when I try to run the app it is said: qrc:/main.qml:3 module "MyComponents" is not installed So, do you know how to solve this? I'm doing anything in a bad way? Thank you very much

@SGaist We have other programs that function with the camera using different environment setups. Specifically the camera was coupled with a DMA based wrapper for direct display, however that uses a QML based application and is not compatible with QWidgets by all appearances. Hoping to get around that by using QCamera

@advtaco The problem was qDebug () or foreach (const kRoom & singleRoom, building-> rooms) ?

@vidisha Well, you could read documentation: http://doc.qt.io/qt-5/qbytearray.html#fromHex

This person has the same problem as I do. Is getting the same errors. My question is posted here: https://forum.qt.io/topic/80928/problem-building-oci-plugin-for-qt-5-9-1/10

@Qt-Enthusiast said in What is QMatirx::inverted is being used in QGraphicsView: I am not sure why in which case mapToScence returns 0 -1 -1 0 You have plenty of information in this thread, so you need to read up on the math and understand it; only then start to write down code. The "throw it against the wall and see what sticks" method will bring you only so far ...

@VRonin said in Server programming best practises: Yeah, probably the friends part is not trivial as you'd need a web server rather than a web client Ooops, sorry, I was thinking about client side. You're right, it's going to be more involved for the server side ...

@jonasqt said in How to properly open a project from a different version of qt: Warning: This file is not a part of any project. Does it compile? What do you know about this project? After googling your warning I found: http://doc.qt.io/qtcreator/creator-clang-codemodel.html

@VRonin said in QObject EventLoop: I always tought it was at time of connect() call If memory serves me, it is in QMetaObject::activate, which is the root point for all meta calls.

Hello to all, thanks a lot for your hints. sneubert recommended to use the following command to run it: ./applicationName --platform linuxfb:fb=/dev/fb1 This works fine. Thanks. Kurt

@tomma ,Thank you very much . yes, you are right. I find the problem immediately when I posted it.

I am checking the stored procedure's return value in my qt application.....

@jsulm thank you all the same.