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qt.network.ssl: No functional TLS backend was found ?

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  • B Offline
    B Offline
    BVladimir
    wrote on last edited by BVladimir
    #8

    addLibraryPath - just in case. env. path is set.
    py script, starting from VS 2019, python 3.9 by standard installer:

    from importlib.machinery import ExtensionFileLoader
    dll = ExtensionFileLoader('py2quik_module', r'C:\C++\for_quik_lua535\x64\Debug\for_quik_lua535.dll').load_module()

    if name == 'main':
    py_obj = dll.py2dll_obj(None)

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #9

      @BVladimir said in qt.network.ssl: No functional TLS backend was found ?:

      py2quik

      Would you mind explaining what exactly you are trying to load ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • B Offline
        B Offline
        BVladimir
        wrote on last edited by
        #10

        My dll "for_quik_lua535.dll" is a Python/C extension named "py2quik_module" in python

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #11

          Out of curiosity, why not use PySide or PyQt since you are already working with Python ?

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • B Offline
            B Offline
            BVladimir
            wrote on last edited by BVladimir
            #12

            I think it will work faster in c++ - a lot of online data is planned. Python for the general scenario.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #13

              What kind of data do you intend to process ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • B Offline
                B Offline
                BVladimir
                wrote on last edited by
                #14

                Data from stock exchange terminal

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                • B Offline
                  B Offline
                  BVladimir
                  wrote on last edited by
                  #15

                  I tried to build an exe file:

                  #include <QGuiApplication>
                  #include <QQmlApplicationEngine>

                  int main(int argc, char* argv[]) {
                  int argc2 = 1;
                  const char* p1{ "C" };
                  const char** argv2 = &p1;

                  QGuiApplication app(argc2, (char**)argv2);
                  
                  QQmlApplicationEngine engine;
                  const QUrl url(QStringLiteral("qrc:tmpQML/tmpQML.qml"));
                  QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                      &app, [url](QObject* obj, const QUrl& objUrl) {
                          if (!obj && url == objUrl)
                              QCoreApplication::exit(-1);
                      }, Qt::QueuedConnection);
                  engine.load(url);
                  
                  return app.exec();
                  

                  }

                  Same QML:

                  import QtQuick 2.12
                  import QtQuick.Controls 2.12

                  ApplicationWindow {

                  title: "Qt Quick Controls Gallery"
                  visible: true
                  width: 640
                  height: 480    
                  

                  }

                  When running from VS 2019, it works fine. And does not try to search any of:

                  QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.2.1/msvc2019_64/plugins/platforms/networkaccess" ...

                  or

                  QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.2.1/msvc2019_64/plugins/platforms/tls" ...

                  It's only with dll problem...

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #16

                    What are going to use to process your data ?

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • B Offline
                      B Offline
                      BVladimir
                      wrote on last edited by
                      #17

                      The main idea is Python calls dll's that receive data and display using qt, General work with data where speed is not needed in Python

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #18

                        Well, I must say I fail to understand your architecture here.

                        What is so speed critical in your app that you need to have your UI in C++ while doing some processing in Python while the rest is done in C++ again.

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                        • B Offline
                          B Offline
                          BVladimir
                          wrote on last edited by
                          #19

                          Data from stock exchange terminal - through с++ & qt, analysis in Python.

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #20

                            Why not load the data directly in Python using something like numpy ?

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                            • B Offline
                              B Offline
                              BVladimir
                              wrote on last edited by
                              #21

                              It is assumed that there can be over 10,000 changing values on the screen once per second. I would like to have fewer lags.

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                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #22

                                If you do all the heavy lifting in Python you should benchmark the GUI as well.

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                • B Offline
                                  B Offline
                                  BVladimir
                                  wrote on last edited by
                                  #23

                                  Maybe, but if it is possible to execute all gui in native c++, wouldn't it be preferable?

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                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #24

                                    As I wrote: benchmark.

                                    Adding a layer of complexity might not be of any benefit in terms of performance, maintainability and architecture.

                                    Interested in AI ? www.idiap.ch
                                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                    • B Offline
                                      B Offline
                                      BVladimir
                                      wrote on last edited by
                                      #25

                                      In any case, I already have a dll for getting data, and I thought it was the easiest way to use it for the gui... But with python, I'll have to do more research...

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                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #26

                                        Wait... you are loading the data from C++ then do processing in Python and then trying to send that back to C++ ?

                                        Interested in AI ? www.idiap.ch
                                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                        • B Offline
                                          B Offline
                                          BVladimir
                                          wrote on last edited by
                                          #27

                                          Yes, some data for analysis in python, and some I would like to leave in c++ for gui

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