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    Update: Forum Guidelines & Code of Conduct

    Reg: Qt application at start-up in Linux

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    • V
      Vishva last edited by

      Hi All,
      I have developed a QT application. i want to this application to start after booting, before login. I dont want the desktop...

      I tried the following..
      added my file to /etc/profile and /etc/rc.d/rc.local... but didnt succeed..

      i coped my script to /init.d

      added below line to rcS
      echo Program Starting
      ./etc/rc.d/init.d/sample.sh

      my script file sample.sh
      echo Program Starting
      insmod /g_webcam.ko
      insmod /uvcvideo.ko
      export VSALPHA=1
      chmod a+x /root/user/my_qt_prog
      ./root/user/my_qt_prog -qws

      While linux booting i get the following message
      Program Starting
      Program Starting
      g_webcam gadget: uvc_function_bind
      g_webcam gadget: Webcam Video Gadget
      g_webcam gadget: g_webcam ready
      *
      But QT program is not running.....*

      Kindly point out my mistake and share your suggestions

      Thanks in Advance

      1 Reply Last reply Reply Quote 0
      • SGaist
        SGaist Lifetime Qt Champion last edited by

        Hi,

        Just to be sure, are you trying to run a Qt gui for embedded linux on a desktop system with X11 installed ?

        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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        • V
          Vishva last edited by

          Embedded Linux...

          1 Reply Last reply Reply Quote 0
          • p3c0
            p3c0 Moderators last edited by

            Hi,

            Have you made sure that your Qt Application is able to resolve all the required dependencies before login ?

            157

            1 Reply Last reply Reply Quote 0
            • SGaist
              SGaist Lifetime Qt Champion last edited by

              Also, what distribution are you using ?

              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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              • V
                Vishva last edited by

                Hi,
                "Qt Application is able to resolve all the required dependencies before login"

                can you be lilttle more specific abt wat u meant??
                i am a newbie....

                I am using Linux Distribution from Freescale. kernel 3.0.35

                And i need to login in my embedded linux to start working in it.. does it mean i have to add login details in my script or??

                1 Reply Last reply Reply Quote 0
                • p3c0
                  p3c0 Moderators last edited by

                  I mean that your Qt Application requires Qt libraries and Qt libs itself depends on other libraries and also maybe you have linked to other third party libraries.

                  You can check that by using the ldd utility.

                  Just edit your script and ldd to your executable and redirect output to a file.

                  For e.g. from your script
                  Add this
                  @
                  ldd /root/user/my_qt_prog > /root/deps
                  @

                  before calling

                  @
                  ./root/user/my_qt_prog -qws
                  @

                  Then check in the "deps" file for any missing dependency or paste its contents here.

                  157

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                  • V
                    Vishva last edited by

                    ldd /root/user/my_app > /root/deps
                    -sh: ldd: not found

                    Hi,
                    ldd utility is not available in my distribution....

                    1 Reply Last reply Reply Quote 0
                    • p3c0
                      p3c0 Moderators last edited by

                      Ok,
                      Try this
                      @
                      LD_TRACE_LOADED_OBJECTS=1 /root/user/my_app > /root/deps
                      @

                      157

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                      • V
                        Vishva last edited by

                        libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x2aba2000)
                        libQtNetwork.so.4 => /usr/lib/libQtNetwork.so.4 (0x2b460000)
                        libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x2b566000)
                        libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x2b80b000)
                        libgthread-2.0.so.0 => /usr/lib/libgthread-2.0.so.0 (0x2aad1000)
                        libz.so.1 => /usr/lib/libz.so.1 (0x2aaef000)
                        libgmodule-2.0.so.0 => /usr/lib/libgmodule-2.0.so.0 (0x2ab09000)
                        libgobject-2.0.so.0 => /usr/lib/libgobject-2.0.so.0 (0x2b8df000)
                        libts-1.0.so.0 => /usr/lib/libts-1.0.so.0 (0x2ab88000)
                        libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x2b924000)
                        libpng.so.3 => /usr/lib/libpng.so.3 (0x2b993000)
                        libasound.so.2 => /usr/lib/libasound.so.2 (0x2b9d1000)
                        libpthread.so.0 => /lib/libpthread.so.0 (0x2ab14000)
                        libstdc++.so.6 => /lib/libstdc++.so.6 (0x2ba94000)
                        libm.so.6 => /lib/libm.so.6 (0x2bb42000)
                        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x2aab6000)
                        libc.so.6 => /lib/libc.so.6 (0x2bbb3000)
                        libdl.so.2 => /lib/libdl.so.2 (0x2ab92000)
                        librt.so.1 => /lib/librt.so.1 (0x2bcda000)
                        /lib/ld-linux.so.3 (0x2ab60000)

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                        • p3c0
                          p3c0 Moderators last edited by

                          Well as per the output all deps are resolved. But is it before login ?
                          As you said you want to launch app before login.

                          bq. i want to this application to start after booting, before login

                          157

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                          • V
                            Vishva last edited by

                            Hi,
                            My exact requirment is:
                            i doesnt want the desktop to show... i want my qt application to be the only screen after the system boots...
                            but wen the system boots it requests for login and password..
                            so i thought its better to launch before login!!!!

                            wat can i do to make my qt application launch without showing the desktop??? can you advice plz

                            1 Reply Last reply Reply Quote 0
                            • SGaist
                              SGaist Lifetime Qt Champion last edited by

                              If your system is debian based, there's a startup script example that you can use to correctly start your application.

                              You also need to launch it from the correct run level.

                              On a side note, the correct place for applications is /usr/bin not /root/

                              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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                              • V
                                Vishva last edited by

                                My distribution is Linux freescale 3.0.35, ubuntu oneiric.
                                Can you share the details about the start-up script!!!

                                1 Reply Last reply Reply Quote 0
                                • SGaist
                                  SGaist Lifetime Qt Champion last edited by

                                  Less exclamation mark please

                                  "Ubuntu boot up howto":https://help.ubuntu.com/community/UbuntuBootupHowto gives some explanation.

                                  "Debian administration":http://www.debian-administration.org/articles/28 also

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

                                  1 Reply Last reply Reply Quote 0
                                  • V
                                    Vishva last edited by

                                    Hi,
                                    After booting the OS requests for login and password... is there a way to do autologin ???
                                    i cannot use keyboard in my embedded device...

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