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error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory

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  • N Offline
    N Offline
    Naveen T
    wrote on last edited by
    #1

    Hi.
    I am using Qt 5.9.1,i am trying to connect MS Azure IoT Hub using QMqtt Protocol through the Boot2Qt device , while running this application to device, i am getting this error like

    error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory
    

    i have already installed Mqtt library and i am following this link to connect Ms Azure IoT Hub.

    Please help me..

    Thanks

    JonBJ Pablo J. RoginaP 2 Replies Last reply
    0
    • N Naveen T

      Hi.
      I am using Qt 5.9.1,i am trying to connect MS Azure IoT Hub using QMqtt Protocol through the Boot2Qt device , while running this application to device, i am getting this error like

      error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory
      

      i have already installed Mqtt library and i am following this link to connect Ms Azure IoT Hub.

      Please help me..

      Thanks

      JonBJ Online
      JonBJ Online
      JonB
      wrote on last edited by
      #2

      @Naveen-T
      From the error message, it may be that it cannot locate libQt5Mqtt.so.5 (where is that file on your system, and how are programs supposed to find it?). However, I have also seen this kind of message if one of the library's dependencies cannot be found. So run an ldd <path-to>/libQt5Mqtt.so.5 and verify it does not report any as missing?

      1 Reply Last reply
      0
      • N Offline
        N Offline
        Naveen T
        wrote on last edited by Naveen T
        #3

        @JonB
        When i am trying to run ldd <path-to>/libQt5Mqtt.so.5 this it replying as

        not a dynamic executable
        

        Thanks

        JonBJ 1 Reply Last reply
        0
        • N Naveen T

          @JonB
          When i am trying to run ldd <path-to>/libQt5Mqtt.so.5 this it replying as

          not a dynamic executable
          

          Thanks

          JonBJ Online
          JonBJ Online
          JonB
          wrote on last edited by
          #4

          @Naveen-T
          Well that doesn't look good, does it?! What does file <path-to>/libQt5Mqtt.so.5 report?

          1 Reply Last reply
          1
          • N Offline
            N Offline
            Naveen T
            wrote on last edited by
            #5

            @JonB
            The file libQt5Mqtt.so.5 is present in system (inside Boot2Qt lib folder) but my program is unable to find it.

            Thanks

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Hi,

              But it doesn't mean that the file is valid hence the suggestion of @JonB to check it with the file command.

              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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              • N Offline
                N Offline
                Naveen T
                wrote on last edited by
                #7

                Hi @SGaist
                Thanks for reply,
                I checked that file command , it replying as

                /home/local/Qt/5.9.1/Boot2Qt/nitrogen6x/toolchain/sysroots/cortexa9hf-neon-poky-linux-gnueabi/usr/lib/libQt5Mqtt.so.5: symbolic link to libQt5Mqtt.so.5.15.0
                
                

                I am not getting how to resolve. please help me out.
                Thanks

                JonBJ 1 Reply Last reply
                0
                • N Naveen T

                  Hi @SGaist
                  Thanks for reply,
                  I checked that file command , it replying as

                  /home/local/Qt/5.9.1/Boot2Qt/nitrogen6x/toolchain/sysroots/cortexa9hf-neon-poky-linux-gnueabi/usr/lib/libQt5Mqtt.so.5: symbolic link to libQt5Mqtt.so.5.15.0
                  
                  

                  I am not getting how to resolve. please help me out.
                  Thanks

                  JonBJ Online
                  JonBJ Online
                  JonB
                  wrote on last edited by JonB
                  #8

                  @Naveen-T

                  I am not getting how to resolve. please help me out.

                  Why don't you help yourself out? If it's a symbolic link, the first thing is to verify the file it points to. file even gives you a -L to save you work. So what does

                  file -L /home/local/Qt/5.9.1/Boot2Qt/nitrogen6x/toolchain/sysroots/cortexa9hf-neon-poky-linux-gnueabi/usr/lib/libQt5Mqtt.so.5
                  

                  report?

                  My guess? 50%, the file pointed to by the symbolic link does not exist, after all the original message was No such file or directory....

                  1 Reply Last reply
                  1
                  • N Offline
                    N Offline
                    Naveen T
                    wrote on last edited by
                    #9

                    @JonB As you told to check

                    "file -L  <path-to>/libQt5Mqtt.so.5"
                    

                    this file reporting like this

                     <path-to>/libQt5Mqtt.so.5 : ELF 32-bit LSB shared object, ARM, EABI5 version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=c48b16491d020bdc39946b012c7f0ae9038652e9, stripped
                    

                    Thank you

                    JonBJ 1 Reply Last reply
                    0
                    • N Naveen T

                      @JonB As you told to check

                      "file -L  <path-to>/libQt5Mqtt.so.5"
                      

                      this file reporting like this

                       <path-to>/libQt5Mqtt.so.5 : ELF 32-bit LSB shared object, ARM, EABI5 version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=c48b16491d020bdc39946b012c7f0ae9038652e9, stripped
                      

                      Thank you

                      JonBJ Online
                      JonBJ Online
                      JonB
                      wrote on last edited by JonB
                      #10

                      @Naveen-T
                      OK, so we go back to the original message you reported (that's still the case, isn't it?):

                      error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory
                      

                      together with

                      When i am trying to run ldd <path-to>/libQt5Mqtt.so.5 this it replying as

                      not a dynamic executable

                      According to me, ldd does follow symbolic links, so I don't understand how your ldd can return "not a dynamic executable" when file says "dynamically linked".

                      I have to say i am still concerned as to what paths you are testing. I would try exactly (please use copy & paste) the following two commands one more time:

                      file /home/local/Qt/5.9.1/Boot2Qt/nitrogen6x/toolchain/sysroots/cortexa9hf-neon-poky-linux-gnueabi/usr/lib/libQt5Mqtt.so.5.15.0
                      
                      ldd /home/local/Qt/5.9.1/Boot2Qt/nitrogen6x/toolchain/sysroots/cortexa9hf-neon-poky-linux-gnueabi/usr/lib/libQt5Mqtt.so.5.15.0
                      
                      1 Reply Last reply
                      0
                      • N Offline
                        N Offline
                        Naveen T
                        wrote on last edited by Naveen T
                        #11

                        @JonB

                        Same result am getting like ldd returns " not a dynamic executable " and file returns "dynamically linked, " .
                        This is the complete error i m getting

                        /opt/<myProjectName>/bin/<myProjectName>: error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory
                        

                        do I need to create same structure in my project??

                        JonBJ 1 Reply Last reply
                        0
                        • N Naveen T

                          @JonB

                          Same result am getting like ldd returns " not a dynamic executable " and file returns "dynamically linked, " .
                          This is the complete error i m getting

                          /opt/<myProjectName>/bin/<myProjectName>: error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory
                          

                          do I need to create same structure in my project??

                          JonBJ Online
                          JonBJ Online
                          JonB
                          wrote on last edited by JonB
                          #12

                          @Naveen-T
                          No, I think you need to resolve this error!

                          Look, I know nothing about your "target devices" etc. I don't even know where you are running the ldd/file commands, I'm thinking you have cross-compilation involved. Is it possible that, on whatever machine you run those from, the "ELF, ARM, EABI5" is not a "dynamic executable" because it is for a different architecture??

                          Apart from that, I think I will bow out, because I have no idea what situation you are in....

                          1 Reply Last reply
                          1
                          • N Naveen T

                            Hi.
                            I am using Qt 5.9.1,i am trying to connect MS Azure IoT Hub using QMqtt Protocol through the Boot2Qt device , while running this application to device, i am getting this error like

                            error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory
                            

                            i have already installed Mqtt library and i am following this link to connect Ms Azure IoT Hub.

                            Please help me..

                            Thanks

                            Pablo J. RoginaP Offline
                            Pablo J. RoginaP Offline
                            Pablo J. Rogina
                            wrote on last edited by
                            #13

                            @Naveen-T said in error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory:

                            i have already installed Mqtt library

                            Please tell us how you installed that library, and where in the device it got installed.

                            In addtion, could you describe what device it is?

                            Upvote the answer(s) that helped you solve the issue
                            Use "Topic Tools" button to mark your post as Solved
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                            Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

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                            • N Offline
                              N Offline
                              Naveen T
                              wrote on last edited by
                              #14

                              @Pablo-J-Rogina @JonB

                              I installed the "QMqtt" using this link and it worked fine for desktop. Now m trying to cross compile it for development kit (Variscite Devlopment kit) and wanted to deploy to it. So for that i have installed QMqtt in device platform folder as explained in above link. I found the issue when m going to create an object of QMqttClient and try to call any function of MqttClient class.

                              QMqttClient *client;
                              client->setPort(8883);
                              

                              Thank You

                              Pablo J. RoginaP 1 Reply Last reply
                              0
                              • N Naveen T

                                @Pablo-J-Rogina @JonB

                                I installed the "QMqtt" using this link and it worked fine for desktop. Now m trying to cross compile it for development kit (Variscite Devlopment kit) and wanted to deploy to it. So for that i have installed QMqtt in device platform folder as explained in above link. I found the issue when m going to create an object of QMqttClient and try to call any function of MqttClient class.

                                QMqttClient *client;
                                client->setPort(8883);
                                

                                Thank You

                                Pablo J. RoginaP Offline
                                Pablo J. RoginaP Offline
                                Pablo J. Rogina
                                wrote on last edited by
                                #15

                                @Naveen-T from that topic you referred, it's not clear for me if the OP is cross-compiling (I guess not in that case).

                                Since you didn't mention yet, are you cross-compiling Qt for this Variscite device? (I guess yes due to .../toolchain/sysroots/... in your previous post)

                                Upvote the answer(s) that helped you solve the issue
                                Use "Topic Tools" button to mark your post as Solved
                                Add screenshots via postimage.org
                                Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

                                1 Reply Last reply
                                1
                                • N Offline
                                  N Offline
                                  Naveen T
                                  wrote on last edited by
                                  #16

                                  @Pablo-J-Rogina Yes i am cross compiling Qt for Variscite device. So i need to add or install those all files inside device?

                                  jsulmJ Pablo J. RoginaP 2 Replies Last reply
                                  0
                                  • N Naveen T

                                    @Pablo-J-Rogina Yes i am cross compiling Qt for Variscite device. So i need to add or install those all files inside device?

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

                                    @Naveen-T said in error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory:

                                    install those all files inside device?

                                    Yes, and your sysroot if you want to cross compile.

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

                                    1 Reply Last reply
                                    0
                                    • N Naveen T

                                      @Pablo-J-Rogina Yes i am cross compiling Qt for Variscite device. So i need to add or install those all files inside device?

                                      Pablo J. RoginaP Offline
                                      Pablo J. RoginaP Offline
                                      Pablo J. Rogina
                                      wrote on last edited by
                                      #18

                                      @Naveen-T said in error while loading shared libraries: libQt5Mqtt.so.5: cannot open shared object file: No such file or directory:

                                      So i need to add or install those all files inside device?

                                      For cross-compilation you need your libraries + headers installed properly in target device, then copy (synchronize) some folders from your target device into the sysroot folder in your host PC and only then attempt to build (cross-compile) any component (Qt framework, MQTT modules, your application).

                                      Once you have the components created in your host PC (but prepared to be run in your target device) then you need to make them available (copy or syncronize) them into the target!

                                      Please take a look at this guide for cross-compiling Qt for RPi; I know it's not your actual device but it may shade some light about the whole cross-compilation process

                                      Upvote the answer(s) that helped you solve the issue
                                      Use "Topic Tools" button to mark your post as Solved
                                      Add screenshots via postimage.org
                                      Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

                                      1 Reply Last reply
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