Subcategories

• General and Desktop

  This is where all the desktop OS and general Qt questions belong.
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  Hi all, I've bought a PCAN-USB FD system to link my PC to an embedded system. The communication works well between my embedded system and PCAN-VIEW. Then, I imported PCANBasic.lib from the PCAN_Basic_API into my Qt Project (Qt 5.12.5 MinGW 64-bit). I copied the PCANBasic.dll in my executable folder. I checked that the plugin is available and that the QcanBusDevice is well connected to the can bus. However, I do not succeed in receiving or sending frames in my Qt Project: no communication with PCAN-VIEW or my embedded system Below is my Qt project. Any help would be appreciated. #include <windows.h> #include <math.h> #include <QtSerialBus> #include <QCanBus> #include <QCanBusDevice> #include <QCanBusFrame> #include <QDebug> #include <QThread> can::can() { if (QCanBus::instance()->plugins().contains(QStringLiteral("peakcan"))) { // plugin available qDebug() << "plugin available"; } QString errorString; const QList<QCanBusDeviceInfo> devices = QCanBus::instance()->availableDevices( QStringLiteral("peakcan"), &errorString); if (!errorString.isEmpty()) qDebug() << errorString; QCanBusDevice *device = QCanBus::instance()->createDevice( QStringLiteral("peakcan"), QStringLiteral("usb0"), &errorString); if (!device) { // Error handling goes here qDebug() << errorString; } else { device->setConfigurationParameter(5,0); device->setConfigurationParameter(4,250000); //device->setConfigurationParameter(5,1); //device->setConfigurationParameter(6,250000); device->connectDevice(); qDebug()<<device->state(); // ConnectedState } QCanBusFrame frame; frame.setFrameId(0x400); frame.setFrameType(QCanBusFrame::DataFrame); QByteArray payload("AAAA"); frame.setPayload(payload); while(1) { device->writeFrame(frame); //Sleep(500); } /*QCanBusFrame frame2; frame2.setFrameId(0x500); frame2.setFrameType(QCanBusFrame::DataFrame); while (1) { if (device->framesAvailable()!=0) { frame2 = device->readFrame(); qDebug() << frame2.payload(); } }*/ } TEMPLATE = app QT += network #QT += webkit QT += sql QT += widgets QT += serialbus QT += core TARGET = proto DEPENDPATH += . INCLUDEPATH += . HEADERS += \ can.h \ SOURCES += \ can.cpp \ main.cpp LIBS += "C:/Users/etudes/Desktop/PCAN_Basic_API/x64/VC_LIB/PCANBasic.lib" INCLUDEPATH += "C:/Users/etudes/Desktop/PCAN_Basic_API/x64"
• Mobile and Embedded

  The forum for developing everything embedded: Linux, WinCE, Symbian, MeeGo... you name it.
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  C:\Users\User\AppData\Local\Android\Sdk\ndk\20.0.5594570\prebuilt\windows-x86_64\bin\make.exe" crashed. Error while building/deploying project MobileOsUsersPieChart (kit: Android for arm64-v8a (Clang Qt 5.12.5 for Android ARM64-v8a)) When executing step "Copy application data" Unable the run the application on the emulator.
• QML and Qt Quick

  Looking for The Bling Thing(tm)? Post here!
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  @SeDi don't forget to use the topic tools to set the topic to solved than😉
• Tools

  Have a question about Qt Creator, our cross-platform IDE, or any of the other tools? Ask here!
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  Hi and welcome to devnet, What version of Qt are you using ? How did you install it ? If using your distribution package manager, then check if you installed the related Qt 5 package.
• 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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  Hello, I want to compile an application I made in QT Creator for windows to run in a Win IOT I have installed in a Raspberry 3. I have no clear information about what could be the process. Anyone have a thread or a link to a guide for to do that. I am sorry, i am rookie with Qt and RB and I am a little bit confused. Sorry. Thank you in advance.
• Game Development

  What can we say - we like games. And you can use Qt to write some. Questions? Ask here.
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  Hello Im currently running my OpenGL project with PyQt and OpenGL and i want to seperate the windows interface against loading stuff which is executed on user interactions. But i have problems with setting up the context to be shared between the windows' QGLWidget, which only renders objects, and the user defined process of getting an object, loading it to the gl buffers and then add it to the renders loop. Do anyone can help me? Or could tell me an alternative, how i can: Control the window without the process of loading objects, which take a huge amount of time to be loaded to the gpu Thank for answers!
• Qt WebKit

  Questions about Qt WebKit and related topics? Post here!
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  hi @LenaTodnem, have you added QT += websockets to your pro file? Regards
• QtWebEngine

  Discussions and questions on QtWebEngine
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  To answer my own topic.... From a reply gained via the PyQt mailing list (pyqt@riverbankcomputing.com), it appears the only way to keep memory consumption down is indeed to delete as one goes along. deletelater() does no good for that if one is not hitting the top-level event loop, which can often be the case. From PyQt this must be achieved via sip.delete(widget). This sip.delete() is apparently effectively the equivalent of C++ delete (which, as I said, in itself does not exist in Python). May be of use to any PyQt-ers who need the equivalent. Armed with this, I can create 1000s of these dialogs with QWebEngineViews, and observe them being deleted and the number of QtWebEngineProcs sticking at 2 as I go along, with the memory being released back to the OS so that it all works OK.
• Language Bindings

  You're using Qt with other languages than C++, eh? Post here!
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  @aha_1980 I will try compiling it myself since I'd like to stick with MinGW. Just tried that but MinGW outputs the following: 0 [main] sh 1816 sync_with_child: child 12536(0x1E4) died before initializing with status code 0xC0000142 208 [main] sh 1816 sync_with_child: *** child state waiting for longjmp /usr/bin/sh: fork: Resource temporarily unavailable mingw32-make: *** [Makefile:55: mingw] Error 128
• 3rd Party Software

  Combining Qt with 3rd party libraries or components? Ask here!
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  Side note for posterity, but I think I found a way to go about it which works better for me and doesn't involve messing around with MSVC. For whatever reason, downloading the full Pylon SDK package with the viewer and everything doesn't work very well for me and doesn't let the cameras be recognised as such by my device. However, if I use only a runtime (I used v5.2, but you could probably use a different one too), it works and gets recognised. QCamera now also recognises the camera, though it fails to set proper viewfinder settings and therefore doesn't work. It also finds 4 cameras instead of just one, which I think is a quirk of the driver or something, since OpenCV does the same thing. I would prefer to do everything with Qt and not be dependent on any external framework, so if there's any pointers on how to set proper viewfinder settings that would be much appreciated, but for now this is fine. What works and does recognise the camera while reading properly from the camera is OpenCV. In order to be used with MinGW, it has to be made from source with make, but I've managed to make it work on my machine. I followed this guide on the subject, and it worked for me after restarting. Anyway, I finally have something I can work on again, and I'll consider this question solved. Thanks for the help.
• Qt for Python

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

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  @SGaist I have two scripts in python, the first: is the interface and the second: is the script of gnuradio that detect signals of wifi
• Qt for WebAssembly

  Specific issues when using Qt for WebAssembly

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  @niqt said in Sql positiotioning: Have i do use some "special" compilation option? My guess is that you did not compile those modules