Subcategories

• General and Desktop

  This is where all the desktop OS and general Qt questions belong.
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  @JonB : Hey, apologies for the late reply. I analyzed the debug logs carefully and figured there was an issue with QSslSocket, unable to resolve things. On further digging down the problem, I came to know that run time SSL libraries were missing. I downloaded the DLLs based on the build version, placed them in the .exe folder, and everything started working.
• Mobile and Embedded

  The forum for developing everything embedded: Linux, WinCE, Symbian, MeeGo... you name it.
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  @JKSH said in How to exit main process when sub thread exit abnormally: @LengJianHanShuang said in How to exit main process when sub thread exit abnormally: does there any api of qt exist that I can use to deal with the disconnect of camera? It sounds like you are using OpenCV to read your camera? Use the same OpenCV API to detect the disconnection. myprepaidcenter It would be even better if your app doesn't quit when the camera is disconnected; instead, see if you can wait for the camera to re-connect again and re-open the imshow window. And then even if I detect the disconnect of camera, I can exit current thread, but how should I do to tell the main process to exit? QCoreApplication::quit() stops the main event loop. If your used a QThread to run your second thread, connect the QThread::finished() signal to the QCoreApplication::quit() slot. Thanks for sharing such an amazing Blog.
• QML and Qt Quick

  Looking for The Bling Thing(tm)? Post here!
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  @SGaist I build Qt Application Manager as follows: 1.qmake -config force-single-process -config hardware-id=12345678 -config enable-widgets -config enable-tests -config enable-examples -config force-libcrypto 2.make
• Tools

  Have a question about Qt Creator, our cross-platform IDE, or any of the other tools? Ask here!
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  Hi, You can do that up to a point. If you have 10 dependencies that everybody can put anywhere they wish, you won't be able to have a generic solution. What could be done is the documentation of a preferred structure for the dependencies to be stored in and then use for example an environment variable that points to the root folder of these dependencies. IIRC, CUDA is using something like that on Windows at least. The pri file solution that you suggest could take advantage of that for example.
• Installation and Deployment

  Your Qt just doesn't want to build? Your compiler can't find the libs? Here's where you find comfort and understanding. And help.
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  Hi and welcome to devnet, Can you show the modifications you made ? What sources are you using ? How did you get them ?
• Game Development

  What can we say - we like games. And you can use Qt to write some. Questions? Ask here.
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  @SGaist Thanks for answering. Basically, I am separating rendering and updating to have fixed-timestep updating (for physics etc) as well as as-fast-as-possible rendering with time interpolation. (Heavily heavily inspired from Gaffer on Games article) My code looks as follows (only slightly simplified): ... within my OpenGLContext void GLWindow::gameLoop() { const double delta = 1.0 / fixedUpdatesPerSecond; auto time = QDateTime::currentMSecsSinceEpoch(); double accumulated = 0.0; while (! this->terminate) { auto newTime = QDateTime::currentMSecsSinceEpoch(); double frameExecution = tdiff(time, newTime); time = newTime; accumulated += frameExecution; while (accumulated >= delta) { // Handle user input / system polling //However, since Qt has event driven polling, let's just call processEvents and then handle any input events by putting their results into a map. QCoreApplication::processEvents(); // Update our states this->updateState(delta); accumulated -= delta; } this->render(accumulated / delta); } } In the same class, I have updateState and render: void MyGL::updateState(float delta) { //... Bunch of commented-out code to make sure base loop works first if(myKeys.at(Qt::Key_W)) { cam->translateAlongForward(delta * 3.0); cam->update(); } } void MyGL::render(float aheadAlphaPercent) { this->update(); } void MyGL::paintGL() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); lambertShader->setViewProj(cam->matrix()); // a lot of other drawing stuff } I know that my rendering code itself works because I initially tested it by just using a QTimer. Instead, I now do the following: ...in main... QApplication a(argc, argv); QSurfaceFormat::setDefaultFormat(format); MainWindow w; w.show(); w.start(); //return a.exec(); // ^Dont^want^to^uncomment^this^ ... MainWindow::start (MainWindow is QMainWindow subclass)... uiElements->glWindow->gameLoop(); //glWindow is subclass of OpenGLContext As you can see, I tried to avoid calling Qt's blocking event loop in QApplication::exec, but am still polling events. However, this doesn't work properly, as described in my first post.
• Qt WebKit

  Questions about Qt WebKit and related topics? Post here!
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  Yes, it's possible.
• QtWebEngine

  Discussions and questions on QtWebEngine
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  AAAAAA I'm stupid, I did a spelling error !!!! request.setHeader(QByteArray("Content-Type"), QByteArray("application/x-wwwform-urlencoded")); must be request.setHeader(QByteArray("Content-Type"), QByteArray("application/x-www-form-urlencoded")); And it is working :-)
• Language Bindings

  You're using Qt with other languages than C++, eh? Post here!
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  Relating to attaching Debugger to Valgrind PID, when I launch qtcreator ./qtcreator The following messages appear before launching Analyze->Valgrind Memory Analyzer with GDB Debug->Attach to Running Application QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' QXcbShmImage: xcb_shm_attach() failed with error: 10 (BadAccess), sequence: 552, resource id: 311, major code: 130 (Unknown), minor code: 1
• 3rd Party Software

  Combining Qt with 3rd party libraries or components? Ask here!
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  Sorry, Qt Creator IDE debugger CAN show the current Fortran variables values... I was trying to see a string parameter, but I forgot that is variable type is a pointer to a C string array... All working...all ok...
• Qt for Python

  For discussion and questions about Qt for Python (PySide 2)

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  @arkero24 first and foremost I would strongly suggest that you stop using the QDesigner and learn to code a pyqt window from scratch -- it is extremely easy and once learned takes no more real time than using the Designer does but what you end up with not only do you fully understand how it works but you can freely interact with that code to enhance it or tweak it as you wish -- rather than having some mysterious black-box untouchable code that is extremely difficult to understand what its doing and/or how to work with it nicely Next to truly help you with this issue it would be best if you supplied a Minimal Reproducible Example of your issue so that we can copy/paste/run it and more easily discern where you issue might reside.
• Qt for WebAssembly

  Specific issues when using Qt for WebAssembly

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  I am trying to build Hello world on MacOS using Qt 5.13.2, binary package. I can build recommended emscripten sdk 1.38.27 from source because it is no longer available precompiled. I suspect that my errors are related to this, no symbols wasm-ld: error: main.o: machine type must be wasm32 wasm-ld: error: moc_main.o: machine type must be wasm32 wasm-ld: error: main.o: machine type must be wasm32 wasm-ld: error: moc_main.o: machine type must be wasm32 wasm-ld: error: moc_main.o: machine type must be wasm32 wasm-ld: error: main.o: machine type must be wasm32 I am getting the same errors from command line and from QtCreator, using emsdk 1.39.3 Is it a way to determine whether it is emsdk error or another issue? **boris@FastMacBook:emsdk$ ./emsdk list The recommended precompiled SDK download is 1.39.3 (b024b71038d1291ed7ec23ecd553bf2c0c8d6da6). To install/activate it, use one of: latest [default (llvm) backend] latest-fastcomp [legacy (fastcomp) backend] Those are equivalent to installing/activating the following: 1.39.3 1.39.3-fastcomp All recent (non-legacy) installable versions are: 1.39.3 1.39.2 1.39.1 1.39.0 1.38.48 1.38.47 1.38.46 1.38.45 1.38.44 1.38.43 1.38.42 1.38.41 1.38.40 1.38.39 1.38.38 1.38.37 1.38.36 1.38.35 1.38.34 1.38.33 The additional following precompiled SDKs are also available for download: sdk-1.30.0-64bit sdk-1.34.1-64bit sdk-1.35.0-64bit**