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Compile QT 5.8 to cross-compile Beaglebone

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  • A Andrey Shmelew

    @jsulm said in Compile QT 5.8 to cross-compile Beaglebone:

    Do you want to use your app on Windows and BBB?

    I want to use my application on BBB, but i want it develop and debug on Windows first.
    I plan to develop multithread stable secutiy system based on BBB/Qt/QML. I already have the Qt libs built for BBB on your Windows machine as well + cross compiler + sysroot. But Qt libs was prebuilt. Now i can develop app on Windows and deploy it on BBB, but i am not sure it is the best way.

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #17

    @Andrey-Shmelew said in Compile QT 5.8 to cross-compile Beaglebone:

    but i am not sure it is the best way

    Why not? It is the usual way to develop for other devices. Personally I would prefer Linux as development machine, but it is doable on Windows as well.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    A 1 Reply Last reply
    0
    • jsulmJ jsulm

      @Andrey-Shmelew said in Compile QT 5.8 to cross-compile Beaglebone:

      but i am not sure it is the best way

      Why not? It is the usual way to develop for other devices. Personally I would prefer Linux as development machine, but it is doable on Windows as well.

      A Offline
      A Offline
      Andrey Shmelew
      wrote on last edited by Andrey Shmelew
      #18

      @jsulm

      You think i should ignore mismatches of libraries versions (*.so.5.3.2 against Qt creator 5.8.0) and keep going?

      jsulmJ 1 Reply Last reply
      0
      • A Andrey Shmelew

        @jsulm

        You think i should ignore mismatches of libraries versions (*.so.5.3.2 against Qt creator 5.8.0) and keep going?

        jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by jsulm
        #19

        @Andrey-Shmelew There is no QtCreator 5.8 - current version is 4.2.2.
        QtCreator is not the same as Qt. QtCreator is an IDE, Qt is a C++ framework. You can use any Qt version with QtCreator. QtCreator version doesn't matter at all.
        Or do you mean you have Qt 5.8 built for BBB on your Windows machine?

        https://forum.qt.io/topic/113070/qt-code-of-conduct

        A 1 Reply Last reply
        2
        • jsulmJ jsulm

          @Andrey-Shmelew There is no QtCreator 5.8 - current version is 4.2.2.
          QtCreator is not the same as Qt. QtCreator is an IDE, Qt is a C++ framework. You can use any Qt version with QtCreator. QtCreator version doesn't matter at all.
          Or do you mean you have Qt 5.8 built for BBB on your Windows machine?

          A Offline
          A Offline
          Andrey Shmelew
          wrote on last edited by Andrey Shmelew
          #20

          @jsulm
          i have
          on Host Windows 10:
          Qt Creator 4.1.0
          Based on Qt 5.7.0 (MSVC 2013, 32 bit)
          Qt Creator has a Kit for BBB

          on Host Windows 10:
          GNU toolchaon for BeagleBone, GCC version 4.9.2 (libs, compiler, gdb debugger, sysroot)

          A 1 Reply Last reply
          0
          • A Andrey Shmelew

            @jsulm
            i have
            on Host Windows 10:
            Qt Creator 4.1.0
            Based on Qt 5.7.0 (MSVC 2013, 32 bit)
            Qt Creator has a Kit for BBB

            on Host Windows 10:
            GNU toolchaon for BeagleBone, GCC version 4.9.2 (libs, compiler, gdb debugger, sysroot)

            A Offline
            A Offline
            Andrey Shmelew
            wrote on last edited by Andrey Shmelew
            #21

            @Andrey-Shmelew

            trying to compile Qt 5.8 for BBB.
            Configure script:

            ../qt-everywhere-opensource-src-5.8.0/configure -platform win32-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-beagleboard-g++ -sysroot C:/SysGCC/Beaglebone/arm-linux-gnueabihf/sysroot -prefix /usr/local/qt5 -device-option CROSS_COMPILE=C:/SysGCC/Beaglebone/bin/arm-linux-gnueabihf- -opensource -confirm-license -v
            

            the output

            Configure summary:
            
            Building on:  arm
            Building for: arm
            Configuration: cross_compile compile_examples enable_new_dtags largefile neon precompile_header shared rpath accessibility release c++11 concurrent dbus no-pkg-config mremap reduce_exports stl
            Build options:
              Mode ................................... release
              Building shared libraries .............. yes
              Using C++ standard ..................... C++11
              Using gold linker ...................... no
              Using new DTAGS ........................ yes
              Using precompiled headers .............. yes
              Using LTCG ............................. no
              Target compiler supports:
                NEON ................................. yes
              Build parts ............................ libs examples
            Qt modules and options:
              Qt Concurrent .......................... yes
              Qt D-Bus ............................... yes
              Qt D-Bus directly linked to libdbus .... no
              Qt Gui ................................. yes
              Qt Widgets ............................. yes
            Support enabled for:
              Accessibility .......................... yes
              Using pkg-config ....................... no
              QML debugging .......................... yes
              udev ................................... no
              Using system zlib ...................... yes
            Qt Core:
              DoubleConversion ....................... yes
                Using system DoubleConversion ........ no
              GLib ................................... no
              iconv .................................. no
              ICU .................................... no
              Logging backends:
                journald ............................. no
                syslog ............................... no
              Using system PCRE ...................... no
            Qt Network:
              getaddrinfo() .......................... no
              getifaddrs() ........................... no
              IPv6 ifname ............................ no
              libproxy ............................... no
              OpenSSL ................................ no
                Qt directly linked to OpenSSL ........ no
              SCTP ................................... no
              Use system proxies ..................... yes
            Qt Sql:
              DB2 (IBM) .............................. no
              InterBase .............................. no
              MySql .................................. no
              OCI (Oracle) ........................... no
              ODBC ................................... no
              PostgreSQL ............................. no
              SQLite2 ................................ no
              SQLite ................................. yes
                Using system provided SQLite ......... no
              TDS (Sybase) ........................... no
            Qt Gui:
              FreeType ............................... yes
                Using system FreeType ................ no
              HarfBuzz ............................... yes
                Using system HarfBuzz ................ no
              Fontconfig ............................. no
              Image formats:
                GIF .................................. yes
                ICO .................................. yes
                JPEG ................................. yes
                  Using system libjpeg ............... no
                PNG .................................. yes
                  Using system libpng ................ no
              OpenGL:
                EGL .................................. no
                Desktop OpenGL ....................... no
                OpenGL ES 2.0 ........................ no
                OpenGL ES 3.0 ........................ no
                OpenGL ES 3.1 ........................ no
              Session Management ..................... yes
            Features used by QPA backends:
              evdev .................................. no
              libinput ............................... no
              mtdev .................................. no
              tslib .................................. no
              xkbcommon-evdev ........................ no
            QPA backends:
              DirectFB ............................... no
              EGLFS .................................. no
              LinuxFB ................................ no
              Mir client ............................. no
            Qt Widgets:
              GTK+ ................................... no
              Styles ................................. Fusion Windows
            Qt PrintSupport:
              CUPS ................................... no
            Qt SerialBus:
              Socket CAN ............................. no
              Socket CAN FD .......................... no
            QtXmlPatterns:
              XML schema support ..................... yes
            Qt QML:
              QML interpreter ........................ yes
              QML network support .................... yes
            Qt Quick:
              Direct3D 12 ............................ no
              AnimatedImage item ..................... yes
              Canvas item ............................ yes
              Support for Quick Designer ............. yes
              Flipable item .......................... yes
              GridView item .......................... yes
              ListView item .......................... yes
              Path support ........................... yes
              PathView item .......................... yes
              Positioner items ....................... yes
              ShaderEffect item ...................... yes
              Sprite item ............................ yes
            Qt Gamepad:
              SDL2 ................................... no
            Qt 3D:
              System Assimp .......................... no
            Qt Wayland Client ........................ no
            Qt Wayland Compositor .................... no
            Qt Bluetooth:
              BlueZ .................................. no
              BlueZ Low Energy ....................... no
              Linux Crypto API ....................... no
            Qt Multimedia:
              ALSA ................................... no
              GStreamer 1.0 .......................... no
              GStreamer 0.10 ......................... no
              Video for Linux ........................ no
              OpenAL ................................. no
              PulseAudio ............................. no
              Resource Policy (libresourceqt5) ....... no
              DirectShow ............................. no
              Windows Media Foundation ............... no
            Qt Location:
              Gypsy GPS Daemon ....................... no
              WinRT Geolocation API .................. no
            Qt Sensors:
              sensorfw ............................... no
            Qt WebEngine:
              Proprietary Codecs ..................... no
              Spellchecker ........................... yes
              ALSA ................................... no
              PulseAudio ............................. no
            
            Note: QtSerialBus: Cannot find linux/can.h and linux/can/raw.h Linux headers for socketCAN support.
            
            Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.
            
            WARNING: No QPA platform plugin enabled! This will
            produce a Qt that cannot run GUI applications.
            The dependencies needed for xcb to build are listed in
            src/plugins/platforms/xcb/README
            
            ERROR: detected a std::atomic implementation that fails for function pointers.
            Please apply the patch corresponding to your Standard Library vendor, found in
              qtbase/config.tests/common/atomicfptr
            
            ERROR: The OpenGL functionality tests failed!
            You might need to modify the include and library search paths by editing QMAKE_INCDIR_OPENGL[_ES2],
            QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform.
            

            Have 1 Warning and 2 Errors :( :( :( :( :(
            What do i do wrong? Help!
            (qt 5.5.0 compiled succesfully earlier)

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            • mzimmersM Offline
              mzimmersM Offline
              mzimmers
              wrote on last edited by
              #22

              This is the command that I used to configure Qt for BBB. Obviously, you'll need to change some pathnames, but it might work better than what you're doing now.

              opt/Qt/5.8/Src/qtbase/configure -platform linux-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-beagleboard-g++ \
               -sysroot /opt/arm-toolchain/sysroot-glibc-linaro-2.23-2017.02-arm-linux-gnueabihf/ \
               -prefix /opt/QtForBBB/ \
               -device-option CROSS_COMPILE=/opt/arm-toolchain/gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- \
               -qt-xcb \
               -nomake tests -nomake examples -no-opengl
              
              A 2 Replies Last reply
              1
              • mzimmersM mzimmers

                This is the command that I used to configure Qt for BBB. Obviously, you'll need to change some pathnames, but it might work better than what you're doing now.

                opt/Qt/5.8/Src/qtbase/configure -platform linux-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-beagleboard-g++ \
                 -sysroot /opt/arm-toolchain/sysroot-glibc-linaro-2.23-2017.02-arm-linux-gnueabihf/ \
                 -prefix /opt/QtForBBB/ \
                 -device-option CROSS_COMPILE=/opt/arm-toolchain/gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- \
                 -qt-xcb \
                 -nomake tests -nomake examples -no-opengl
                
                A Offline
                A Offline
                Andrey Shmelew
                wrote on last edited by
                #23

                @mzimmers

                ok, i see you are using Linux host machine.
                Where to download linaro toolchain?

                jsulmJ 1 Reply Last reply
                0
                • A Andrey Shmelew

                  @mzimmers

                  ok, i see you are using Linux host machine.
                  Where to download linaro toolchain?

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #24

                  @Andrey-Shmelew

                  https://www.linaro.org/downloads/

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  1
                  • mzimmersM mzimmers

                    This is the command that I used to configure Qt for BBB. Obviously, you'll need to change some pathnames, but it might work better than what you're doing now.

                    opt/Qt/5.8/Src/qtbase/configure -platform linux-g++ -xplatform linux-arm-gnueabi-g++ -release -device linux-beagleboard-g++ \
                     -sysroot /opt/arm-toolchain/sysroot-glibc-linaro-2.23-2017.02-arm-linux-gnueabihf/ \
                     -prefix /opt/QtForBBB/ \
                     -device-option CROSS_COMPILE=/opt/arm-toolchain/gcc-linaro-6.3.1-2017.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- \
                     -qt-xcb \
                     -nomake tests -nomake examples -no-opengl
                    
                    A Offline
                    A Offline
                    Andrey Shmelew
                    wrote on last edited by Andrey Shmelew
                    #25

                    @mzimmers
                    i Cross Compiled Qt 5.8, so now when i try do deploy, and i've got an errors:

                    /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5PrintSupport.so.5: no version information available (required by /usr/test/untitled2)
                    /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Script.so.5: no version information available (required by /usr/test/untitled2)
                    /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Gui.so.5: no version information available (required by /usr/test/untitled2)
                    /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5: no version information available (required by /usr/test/untitled2)
                    /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5: no version information available (required by /usr/test/untitled2)
                    /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: no version information available (required by /usr/test/untitled2)
                    libEGL warning: DRI3: Screen seems not DRI3 capable
                    libEGL warning: DRI2: failed to authenticate
                    /usr/test/untitled2: relocation error: /usr/test/untitled2: symbol _ZN9QDateTimeC1EOS_, version Qt_5 not defined in file libQt5Core.so.5 with link time reference
                    Application finished with exit code 127.
                    

                    Help...?

                    jsulmJ 1 Reply Last reply
                    0
                    • A Andrey Shmelew

                      @mzimmers
                      i Cross Compiled Qt 5.8, so now when i try do deploy, and i've got an errors:

                      /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5PrintSupport.so.5: no version information available (required by /usr/test/untitled2)
                      /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Script.so.5: no version information available (required by /usr/test/untitled2)
                      /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Gui.so.5: no version information available (required by /usr/test/untitled2)
                      /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Widgets.so.5: no version information available (required by /usr/test/untitled2)
                      /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5: no version information available (required by /usr/test/untitled2)
                      /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: no version information available (required by /usr/test/untitled2)
                      libEGL warning: DRI3: Screen seems not DRI3 capable
                      libEGL warning: DRI2: failed to authenticate
                      /usr/test/untitled2: relocation error: /usr/test/untitled2: symbol _ZN9QDateTimeC1EOS_, version Qt_5 not defined in file libQt5Core.so.5 with link time reference
                      Application finished with exit code 127.
                      

                      Help...?

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #26

                      @Andrey-Shmelew How do you deploy?
                      And I guess you get this errors when you try to start your app on the target device, right?
                      Do the Qt libraries /usr/lib/arm-linux-gnueabihf/libQt5* have the same version number as the cross compiled Qt (5.8)?
                      To me it looks like you're using a different Qt version on the target device.
                      See http://doc.qt.io/qt-5/linux-deployment.html for deployment to a Linux system.

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                      A 1 Reply Last reply
                      0
                      • jsulmJ jsulm

                        @Andrey-Shmelew How do you deploy?
                        And I guess you get this errors when you try to start your app on the target device, right?
                        Do the Qt libraries /usr/lib/arm-linux-gnueabihf/libQt5* have the same version number as the cross compiled Qt (5.8)?
                        To me it looks like you're using a different Qt version on the target device.
                        See http://doc.qt.io/qt-5/linux-deployment.html for deployment to a Linux system.

                        A Offline
                        A Offline
                        Andrey Shmelew
                        wrote on last edited by Andrey Shmelew
                        #27

                        @jsulm said in Compile QT 5.8 to cross-compile Beaglebone:

                        And I guess you get this errors when you try to start your app on the target device, right?

                        absolutely!

                        Do the Qt libraries /usr/lib/arm-linux-gnueabihf/libQt5* have the same version number as the cross compiled Qt (5.8)?

                        No, they have 5.3.2 version number.

                        if i replace libQt5SerialPort.so.5 (version 5.3.2) by libQt5SerialPort.so.5 (version 5.8.0); i've got errors:

                        /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5)
                        /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5)
                        /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5)
                        
                        jsulmJ 1 Reply Last reply
                        0
                        • A Andrey Shmelew

                          @jsulm said in Compile QT 5.8 to cross-compile Beaglebone:

                          And I guess you get this errors when you try to start your app on the target device, right?

                          absolutely!

                          Do the Qt libraries /usr/lib/arm-linux-gnueabihf/libQt5* have the same version number as the cross compiled Qt (5.8)?

                          No, they have 5.3.2 version number.

                          if i replace libQt5SerialPort.so.5 (version 5.3.2) by libQt5SerialPort.so.5 (version 5.8.0); i've got errors:

                          /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5)
                          /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5: no version information available (required by /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5)
                          /usr/test/untitled2: /usr/lib/arm-linux-gnueabihf/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /usr/lib/arm-linux-gnueabihf/libQt5SerialPort.so.5)
                          
                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by jsulm
                          #28

                          @Andrey-Shmelew If you replace then replace all used libraries not just one of them!
                          And actually you should NOT replace system libraries as other applications could depend on them!
                          Instead deploy your app together with needed libraries as described in the link I posted before.

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                          A 1 Reply Last reply
                          2
                          • jsulmJ jsulm

                            @Andrey-Shmelew If you replace then replace all used libraries not just one of them!
                            And actually you should NOT replace system libraries as other applications could depend on them!
                            Instead deploy your app together with needed libraries as described in the link I posted before.

                            A Offline
                            A Offline
                            Andrey Shmelew
                            wrote on last edited by
                            #29

                            @jsulm

                            thanks for the link.

                            probably i should paste all of needed libraries to separate folder (for example "/usr/lib/my5-8libs")

                            and then somehow to link my application to these libraries?

                            jsulmJ 1 Reply Last reply
                            0
                            • A Andrey Shmelew

                              @jsulm

                              thanks for the link.

                              probably i should paste all of needed libraries to separate folder (for example "/usr/lib/my5-8libs")

                              and then somehow to link my application to these libraries?

                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #30

                              @Andrey-Shmelew You can put the libs into a separate folder, but you should use /usr/local/lib/... not /usr/lib
                              But then you either need to tell the system where to find them using LD_LIBRARY_PATH (described in the link I posted), or use RPATH to set the path to the libs in your executable, see https://en.wikipedia.org/wiki/Rpath
                              Using /usr/local/lib probably does not require LD_LIBRARY_PATH nor RPATH, but any other locations not searched by the OS by default do.

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

                              1 Reply Last reply
                              2
                              • A Offline
                                A Offline
                                Andrey Shmelew
                                wrote on last edited by Andrey Shmelew
                                #31

                                what 's the problem might be here when i start an application:

                                This application failed to start because it could not find or load the Qt platform plugin "xcb"
                                in "".
                                
                                Reinstalling the application may fix this problem.
                                Aborted
                                

                                it came when i uploaded new libraries 5.8.0 to /usr/lib/new5dot8libs/
                                and entered commands:

                                LD_LIBRARY_PATH=/usr/lib/new5dot8libs
                                export LD_LIBRARY_PATH
                                
                                mzimmersM 1 Reply Last reply
                                0
                                • A Andrey Shmelew

                                  what 's the problem might be here when i start an application:

                                  This application failed to start because it could not find or load the Qt platform plugin "xcb"
                                  in "".
                                  
                                  Reinstalling the application may fix this problem.
                                  Aborted
                                  

                                  it came when i uploaded new libraries 5.8.0 to /usr/lib/new5dot8libs/
                                  and entered commands:

                                  LD_LIBRARY_PATH=/usr/lib/new5dot8libs
                                  export LD_LIBRARY_PATH
                                  
                                  mzimmersM Offline
                                  mzimmersM Offline
                                  mzimmers
                                  wrote on last edited by
                                  #32

                                  @Andrey-Shmelew something is not right with your path variable. I notice that your command is overwriting (rather than adding to) any existing LD_LIBRARY_PATH variable; is this intentional? One of these methods is more conventional:

                                  PATH=$PATH:/new/path
                                  PATH=/new/path:$PATH
                                  

                                  Also, did you put this command in a startup script? I'm not sure the export will survive a system restart.

                                  1 Reply Last reply
                                  0
                                  • A Offline
                                    A Offline
                                    Andrey Shmelew
                                    wrote on last edited by Andrey Shmelew
                                    #33

                                    hi! i have absolutely the same trouble:
                                    i reproduse it with absolutely minimal qml example
                                    When i deploy qt 5.5 application on beaglebone device (arm linux gnueabihf) - then works perfectly
                                    When i deploy qt 5.8 - the error appears:

                                    QQmlApplicationEngine failed to load component
                                    qrc:/main.qml:-1 File not found
                                    

                                    // this somehow works but the window is blank
                                    main.cpp:

                                    #include <QGuiApplication>
                                    #include <QQuickView>
                                    
                                    int main(int argc, char *argv[])
                                    {
                                        QGuiApplication app(argc, argv);
                                    
                                        QQuickView view;
                                        view.setSource(QUrl::fromLocalFile("main.qml"));
                                        view.show();
                                    
                                        return app.exec();
                                    }
                                    
                                    jsulmJ 1 Reply Last reply
                                    0
                                    • A Andrey Shmelew

                                      hi! i have absolutely the same trouble:
                                      i reproduse it with absolutely minimal qml example
                                      When i deploy qt 5.5 application on beaglebone device (arm linux gnueabihf) - then works perfectly
                                      When i deploy qt 5.8 - the error appears:

                                      QQmlApplicationEngine failed to load component
                                      qrc:/main.qml:-1 File not found
                                      

                                      // this somehow works but the window is blank
                                      main.cpp:

                                      #include <QGuiApplication>
                                      #include <QQuickView>
                                      
                                      int main(int argc, char *argv[])
                                      {
                                          QGuiApplication app(argc, argv);
                                      
                                          QQuickView view;
                                          view.setSource(QUrl::fromLocalFile("main.qml"));
                                          view.show();
                                      
                                          return app.exec();
                                      }
                                      
                                      jsulmJ Offline
                                      jsulmJ Offline
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on last edited by jsulm
                                      #34

                                      @Andrey-Shmelew You're using a relative path:

                                      view.setSource(QUrl::fromLocalFile("main.qml"));
                                      

                                      Depending from where you start your app the file will not be found.
                                      You should construct an absolute path at runtime using http://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath

                                      https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                      • jsulmJ jsulm

                                        @Andrey-Shmelew You're using a relative path:

                                        view.setSource(QUrl::fromLocalFile("main.qml"));
                                        

                                        Depending from where you start your app the file will not be found.
                                        You should construct an absolute path at runtime using http://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath

                                        A Offline
                                        A Offline
                                        Andrey Shmelew
                                        wrote on last edited by Andrey Shmelew
                                        #35

                                        @jsulm
                                        um, should i make something like this?

                                            QQuickView view;
                                            view.setSource(QUrl::fromLocalFile("C:/qtqml57/main.qml"));
                                            view.show();
                                        

                                        the output is still

                                        file:///C:/qtqml57/main.qml: File not found
                                        
                                        jsulmJ 1 Reply Last reply
                                        0
                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #36

                                          Because that file is located on your Windows machine.

                                          If you don't want to put it in a Qt resource, then do as @jsulm suggested: build the path at run time.

                                          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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