@SGaist That seems to be the solution, haha! Thanks.

@Turbotroop OK, so: Is the code pasted now currently what you have, exactly? What error do you currently have? Have you acted on the previous comments? For example: although it won't generate a compilation error, it does not make any sense to set up all these boxes or arrays in the main window destructor, does it? Why not in, say, the constructor instead?

@Chris-Kawa thank you, it helped to set the margins!

@jsulm ou! thank you! you had helped me a lot!!

Hi and welcome to devnet, That's a bit too vast of a topic to have a simpler answer. What element of Cyber Security do you have in mind ? At what level ? Cyber Security starts from giving people access to certain hardware / applications to the boot process of your machines/devices, the kernel/OS they are running, the applications you are using on them, the libraries that composes these applications, the devices you plug in the machines, etc.

@SimonSchroeder QDir is only for directories, not for files. So it is not a (suitable) candidate for general "file paths".

@Zwenig die einfachste Methode ist der package manager. den findest du eigentlich vorinstalliert in der Menüleiste, einfach nach Creator oder QtCreator suchen und installieren. darüber bekommst du auch eine version von Qt (Bibliothek), sollte neuer als 5.11 sein, also sollte dein Programm damit auch kompilieren

@ELIF Please post the actual compiler/linker error. it is somewhere above of what you posted.

when I rerun, I am told that QtWebView cannot contain more than one item, so I guess I cannot save a c++ class in QtWebView, going through the doc I found that the c++ classes I needed had already been extended to the quick module. So, I'm going to use the c++ classes in this module instead. Thank you very much for your help.

@JonBI don't know if that's the problem, but I downloaded the QWebView module using the maintenance tool but still QtCreator does not recognize it as an existing module.

@Gojir4 thank you so much

Hi The normal way to find out what is going on is using the debugger. So compile the app In debug mode and start it. When it crashes you should be able to see what it was doing in the call stack. The call stack is the area under the editor window when starting in debug mode As you can see it shows where the program was running. The function list. This should give a hint as to why it does crash.

Hi, @J-Hilk! Looks like i found desired method in QModbusDataUnit class docs. Don't know how i missed it being mentioned in List of All Members for QModbusRtuSerialMaster. I guess digging into Qt docs about Modbus was a proper way to solve this :) QModbusDataUnit::QModbusDataUnit(QModbusDataUnit::RegisterType type, int address, const QVector<quint16> &data) In my case this will be: QModbusDataUnit input(QModbusDataUnit::InputRegisters, 3001, data); Thanks for joining my journey!

@ADR_PT you may want to start using QSerialPort the asynchronous (non-blocking) approach, by using signals & slots. Take a look at the serial terminal example

my compiler is mingw32bit and mongocxx driver build in 64 bit . so thats make problem , i solved it by installing 64bit Qt.

@raven-worx Thank you very much for your time, my issue is resolved :-) It was indeed the debug build causing the issue, and I am using the correct qlmdir to avoid unnecessary imports. Thank you again and have a nice day!

Hi, You might want to check KDAB's KDSoap library.

@JonB Thanks for your insight. I did as you suggested and found one of my local variable's address a nullptr(though not sure where it came from). I changed a few lines of code and apparently, my code works fine now. @Christian-Ehrlicher @J-Hilk thanks!

See https://bugreports.qt.io/browse/QTCREATORBUG-26918

@JonB This is exactly what I was expecting and what I thought of.... These type of games, where you have ingame shops and a lot of inventories... If you left-click an item, you probably buy it from shop or use it, if you right-click, you drop it or sell it :)

Thank you all guys. Your suggestions and expert opinion helped a lot with solving the problem. QT forum is always so helpful. After trying many things here is the conclusion and code is now working perfectly fine I removed the tic toc part time(&start); timer = double(getTickCount()); tic(); It was working but crashing then just to make sure that QImage is not NULL I removed the img = QImage(); // releasing memory with if(!img.isNull()) img = QImage(); Its working perfectly fine now.

@neda The data is in pkt_data as far as i can see from docs so try QByteArray databuf = QByteArray(reinterpret_cast<char*>(pkt_data), header->len); qDebug()<<"data: "<<databuf ;

@Imran-Hassan said in QT image display is not working without declaring openCV namedWindow in windows 10: The problem is solved great, so please don't forget to mark your post as such!

How did you do it now?

@simone-malvezzi No, Qt does not supply a set of measurement conversion tables, that's not its job. You could write it yourself, see if there is any pre-written C++ libraries/tables provided, or possibly grab them off the net, either dynamically or statically. As an aside, you will have to decide how "complete" you want to be. Personally I am great fan of Imperial instead of this Metric rubbish, but even I don't measure in "rods", "poles" & "perches" (e.g. http://www.northcravenheritage.org.uk/NCHTJto2009/Journals/2006/RodsPolesPerches/RodsPolesPerches.html) ;-) Though --- and I'm sure you're fascinated --- in winter I measure temperature in Centigrade but in summer I measure in Farenheit....

@SGaist My data is ready to append. So i append them directly. There are 10-100 QTextEdits. I append 100-200 line to each of QTextEdits. Lines have arround 300 characters. I have one vector of vectors source. By the way, i moved my data source to a different thread. Then emitted signals to append with BlockingQueuedConnection. Gui is responsive now. But its not smooth. I dont know using blockingqueuedconnection instead of queuedconnection is the right way but my gui is responsive while appending strings now.

A quick look on bcrypt's webpage tells me this is not a library, but a program. If you want to have it as a library, there is not support for this out of the box. You need to figure it out by yourself. The general instructions for building are to use make. (Usually, nmake is the equivalent on Windows.) I don't see any instructions for Windows on the webpage. You'll have to look through the README's, etc. to figure it out. cmake and qmake will not help as these will just generate makefiles and not compile anything. However, there is already a makefile, so you don't have to run cmake or qmake to create them.

No it's not, you can see that with its constructors that take a QSqlDatabase parameter. No clear is not called, the destructor is. There's no need to create QSqlQuery objects on the heap.

Hi If the database table type is of type date, it wont like a string formatted as SunFeb2020 so you need to match the toString format to the one expceted by the DBMS.

Hi Thank you for sharing. I don't know anything about Pokemon but its cool you used gif so they are animated and the code looks clean and structured.

@RunThiner There's no need for such a loop. QSerialPort already provides an asynchronous API and if you really want to wait for data to be available, there's a blocking API for that as shown in the QSerialPort details.

@rohit1729 You should read this first: https://doc.qt.io/qt-5/signalsandslots.html void panelB::mouseMoveEvent(QMouseEvent *eventMove) { QString txt; txt = QString("(X:%1,Y:%2)").arg(eventMove->pos().x()).arg(eventMove->pos().y()); emit coordinatesChanged(eventMove->pos().x(), eventMove->pos().y()); //qDebug() << txt; } coordinatesChanged would be the signal.

@Gojir4 thanks, I am trying that right now. I’ve added a 1s delay in my image grabbing thread. Let’s see. Fingers crossed!

Hi You can use https://doc.qt.io/qt-5/qgraphicsitem.html#qgraphicsitem_cast and try cast to your child type if it really is, you can then use its members. so check for NULL and note the docs saying " reimplement the type() function"