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cross compiling qt in raspberry pi

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  • EddyE Eddy

    Hi Amruz,

    Did you try to set your application window maximized?

    A Offline
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    amruz
    wrote on last edited by amruz
    #5

    @Eddy by maximized u meant setting the window to its default maximum size right?
    I tried with that also
    the weird thing is after showing this error also the application is still running but no output ..its idle..i couldnt understand what exactly is going on

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    • EddyE Offline
      EddyE Offline
      Eddy
      wrote on last edited by Eddy
      #6

      With a QML based application I used :

      #include <QtGui/QGuiApplication>
      #include "qtquick2applicationviewer.h"
      
      int main(int argc, char *argv[])
      {
          QGuiApplication app(argc, argv);
      
          QtQuick2ApplicationViewer viewer;
          viewer.setMainQmlFile(QStringLiteral("qml/mynoteapp/main.qml"));
          viewer.showExpanded();// <- this one does the trick
      
          return app.exec();
      }
      

      I remember succeeding with a widget based application also, so try showMaximized or showFullScreen

      Qt Certified Specialist
      www.edalsolutions.be

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      • EddyE Eddy

        With a QML based application I used :

        #include <QtGui/QGuiApplication>
        #include "qtquick2applicationviewer.h"
        
        int main(int argc, char *argv[])
        {
            QGuiApplication app(argc, argv);
        
            QtQuick2ApplicationViewer viewer;
            viewer.setMainQmlFile(QStringLiteral("qml/mynoteapp/main.qml"));
            viewer.showExpanded();// <- this one does the trick
        
            return app.exec();
        }
        

        I remember succeeding with a widget based application also, so try showMaximized or showFullScreen

        A Offline
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        amruz
        wrote on last edited by
        #7

        @Eddy thx for the reply..
        ya tried that also..
        no luck.. :(

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        • EddyE Offline
          EddyE Offline
          Eddy
          wrote on last edited by
          #8
          the weird thing is after showing this error also the application is still running but no output ..its idle..i couldnt understand what exactly is going on
          

          By giving it a maximized size we force it to show on the screen.

          Qt Certified Specialist
          www.edalsolutions.be

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          • EddyE Eddy
            the weird thing is after showing this error also the application is still running but no output ..its idle..i couldnt understand what exactly is going on
            

            By giving it a maximized size we force it to show on the screen.

            A Offline
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            amruz
            wrote on last edited by
            #9

            @Eddy is it really with the problem of sizing or does it have anything to deal with the problem of compiling without x11?
            after giving showfullscreen also the same error is coming and no output display in the raspberry pi

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            • EddyE Offline
              EddyE Offline
              Eddy
              wrote on last edited by
              #10
              does it have anything to deal with the problem of compiling without x11?
              

              It depends. I suppose your sysroot is ok and you can mount the pi, something like this?

              sudo mount -o loop,offset=62914560 /home/eddy/opt/raspberry-working-image.img /mnt/rasp-pi-rootfs
              

              How do you know the program is running on your Pi? How do you start it?
              What Pi version are you using?
              Could be good to show us all the details. Maybe someone that used the Pi recently can help out.

              Qt Certified Specialist
              www.edalsolutions.be

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              • EddyE Eddy
                does it have anything to deal with the problem of compiling without x11?
                

                It depends. I suppose your sysroot is ok and you can mount the pi, something like this?

                sudo mount -o loop,offset=62914560 /home/eddy/opt/raspberry-working-image.img /mnt/rasp-pi-rootfs
                

                How do you know the program is running on your Pi? How do you start it?
                What Pi version are you using?
                Could be good to show us all the details. Maybe someone that used the Pi recently can help out.

                A Offline
                A Offline
                amruz
                wrote on last edited by amruz
                #11

                @Eddy i am using pi2 touch screen. I am running the program in the command line itself without using startx.

                when i login using the username and password in pi and then i run the program ./programname
                it is showing the "unable to query physical size..." and nothing happens. the cursor blinks there till i stop running my program in my laptop

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                • EddyE Offline
                  EddyE Offline
                  Eddy
                  wrote on last edited by
                  #12

                  @amruz
                  I'm sorry, but I'm out of ideas.

                  I hope someone else can help you.

                  Qt Certified Specialist
                  www.edalsolutions.be

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                  • EddyE Eddy

                    @amruz
                    I'm sorry, but I'm out of ideas.

                    I hope someone else can help you.

                    A Offline
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                    amruz
                    wrote on last edited by
                    #13

                    @Eddy thanks for the reply..
                    i also hope so

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                    • EddyE Eddy

                      @amruz
                      I'm sorry, but I'm out of ideas.

                      I hope someone else can help you.

                      A Offline
                      A Offline
                      amruz
                      wrote on last edited by amruz
                      #14

                      @Eddy while debugging i am getting this message and the hour glass is just keeping on running

                      Debugging starts
                      Listening on port 10000
                      Remote debugging from host 192.168.15.128
                      Process /home/pi/qtinpitry created; pid = 925
                      File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
                      Unable to query physical screen size, defaulting to 100 dpi.
                      To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

                      i have a doubt.. this message says that the file transfer is too slow. Is it because of this reason that i am not getting the widget display in raspberry pi?
                      Any suggestions on solving this problem?

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                      • A amruz

                        @Eddy while debugging i am getting this message and the hour glass is just keeping on running

                        Debugging starts
                        Listening on port 10000
                        Remote debugging from host 192.168.15.128
                        Process /home/pi/qtinpitry created; pid = 925
                        File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
                        Unable to query physical screen size, defaulting to 100 dpi.
                        To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

                        i have a doubt.. this message says that the file transfer is too slow. Is it because of this reason that i am not getting the widget display in raspberry pi?
                        Any suggestions on solving this problem?

                        H Offline
                        H Offline
                        hardikh
                        wrote on last edited by
                        #15

                        @amruz I am having same issue ....following qtrpi.com instruction... did u find any solution

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                        • H hardikh

                          @amruz I am having same issue ....following qtrpi.com instruction... did u find any solution

                          A Offline
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                          amruz
                          wrote on last edited by
                          #16

                          @hardikh not yet..kindly post here if u get the solution..

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                          • A amruz

                            @hardikh not yet..kindly post here if u get the solution..

                            H Offline
                            H Offline
                            hardikh
                            wrote on last edited by
                            #17

                            @amruz yes did work just few minutes before able to do run qopenglwidget on raspberry pi my hdmi screen FHD and able to set resolution and screen size as suited for raspberry pin 7 inch screen followed https://wiki.qt.io/RaspberryPi2EGLFS and http://www.bytran.org/qtrpicrosscompile.htm now will install more module to qt than setup creator on ubuntu

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                            • H hardikh

                              @amruz yes did work just few minutes before able to do run qopenglwidget on raspberry pi my hdmi screen FHD and able to set resolution and screen size as suited for raspberry pin 7 inch screen followed https://wiki.qt.io/RaspberryPi2EGLFS and http://www.bytran.org/qtrpicrosscompile.htm now will install more module to qt than setup creator on ubuntu

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                              amruz
                              wrote on last edited by amruz
                              #18

                              @hardikh i actually followed the wiki page and the blog for cross compiling qt..still i am facing this error..does setting the physical height and width solved the problem?

                              i tried by setting the QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT in .bashrc but no change

                              can you mention what steps you followed for correcting it

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