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Could not find the Qt platform plugin "eglfs" in ""

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  • K kutluyigitturk

    @JKSH I typed the command "sudo apt install qtcreator" in terminal and ran it

    JKSHJ Offline
    JKSHJ Offline
    JKSH
    Moderators
    wrote on last edited by
    #5

    @kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

    I typed the command "sudo apt install qtcreator" in terminal and ran it

    As @JonB said, Qt Creator is an IDE. You need to install Qt libraries too.

    Also, it's not clear from your post:

    1. Did you get the error message when trying to run Qt Creator? Or did you get the error message when trying to run your project executable?
    2. Did you install Qt Creator on the Pi directly? Or did you install it on your host PC?

    Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

    K 1 Reply Last reply
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    • JKSHJ JKSH

      @kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

      I typed the command "sudo apt install qtcreator" in terminal and ran it

      As @JonB said, Qt Creator is an IDE. You need to install Qt libraries too.

      Also, it's not clear from your post:

      1. Did you get the error message when trying to run Qt Creator? Or did you get the error message when trying to run your project executable?
      2. Did you install Qt Creator on the Pi directly? Or did you install it on your host PC?
      K Offline
      K Offline
      kutluyigitturk
      wrote on last edited by
      #6

      @JKSH I get the error message when trying to run my project executable. I did install it on my host PC.

      I sent the executable version of the project I created to Orange Pi and was able to run the project file with the ./OrangeDemoQqml command in the Orange Pi terminal. But after accessing Orange Pi via SSH connection from my host computer, I type ./OrangeDemoQml in the terminal and I get an error.!

      error.png

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #7

        Hi,

        Start it with the QT_DEBUG_PLUGINS environment variable set to 1 to see why exactly it fails to load the plugin.

        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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        0
        • SGaistS SGaist

          Hi,

          Start it with the QT_DEBUG_PLUGINS environment variable set to 1 to see why exactly it fails to load the plugin.

          K Offline
          K Offline
          kutluyigitturk
          wrote on last edited by
          #8

          @SGaist I don't know exactly how to do this, can you describe?

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #9
            export QT_DEBUG_PLUGINS=1
            

            Then call your application.

            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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            • K Offline
              K Offline
              kutluyigitturk
              wrote on last edited by
              #10

              @SGaist said in Could not find the Qt platform plugin "eglfs" in "":

              export QT_DEBUG_PLUGINS=1

              These are the output lines

              QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5opi/plugins/platforms" ...
              QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqlinuxfb.so"
              Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqlinuxfb.so, metadata=
              {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                      "Keys": [
                          "linuxfb"
                      ]
                  },
                  "archreq": 0,
                  "className": "QLinuxFbIntegrationPlugin",
                  "debug": false,
                  "version": 331520
              }
              
              
              Got keys from plugin meta data ("linuxfb")
              QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqminimal.so"
              Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqminimal.so, metadata=
              {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                      "Keys": [
                          "minimal"
                      ]
                  },
                  "archreq": 0,
                  "className": "QMinimalIntegrationPlugin",
                  "debug": false,
                  "version": 331520
              }
              
              
              Got keys from plugin meta data ("minimal")
              QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqoffscreen.so"
              Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqoffscreen.so, metadata=
              {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                      "Keys": [
                          "offscreen"
                      ]
                  },
                  "archreq": 0,
                  "className": "QOffscreenIntegrationPlugin",
                  "debug": false,
                  "version": 331520
              }
              
              
              Got keys from plugin meta data ("offscreen")
              QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqvnc.so"
              Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqvnc.so, metadata=
              {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                      "Keys": [
                          "vnc"
                      ]
                  },
                  "archreq": 0,
                  "className": "QVncIntegrationPlugin",
                  "debug": false,
                  "version": 331520
              }
              
              
              Got keys from plugin meta data ("vnc")
              QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqwebgl.so"
              Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqwebgl.so, metadata=
              {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                      "Keys": [
                          "webgl"
                      ]
                  },
                  "archreq": 0,
                  "className": "QWebGLIntegrationPlugin",
                  "debug": false,
                  "version": 331520
              }
              
              
              Got keys from plugin meta data ("webgl")
              QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqxcb.so"
              Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqxcb.so, metadata=
              {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                      "Keys": [
                          "xcb"
                      ]
                  },
                  "archreq": 0,
                  "className": "QXcbIntegrationPlugin",
                  "debug": false,
                  "version": 331520
              }
              
              
              Got keys from plugin meta data ("xcb")
              QFactoryLoader::QFactoryLoader() checking directory path "/home/opi/platforms" ...
              qt.qpa.plugin: Could not find the Qt platform plugin "eglfs" in ""
              This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
              
              Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.
              
              Aborted
              
              
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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #11

                Then the version of Qt you have currently installed on your target does not provide that plugin.

                Did you deploy the one you use for cross-compiling your application ?

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

                K 1 Reply Last reply
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                • SGaistS SGaist

                  Then the version of Qt you have currently installed on your target does not provide that plugin.

                  Did you deploy the one you use for cross-compiling your application ?

                  K Offline
                  K Offline
                  kutluyigitturk
                  wrote on last edited by
                  #12

                  @SGaist

                  I do not have qt installed on the Orange Pi that I intend to run.

                  I think our main goal is to transfer executable files of qt projects to Orange Pi and connect remotely via ssh and run projects on Orange Pi.

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

                    How did you install Qt on the OrangePi ?

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

                    K 1 Reply Last reply
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                    • SGaistS SGaist

                      How did you install Qt on the OrangePi ?

                      K Offline
                      K Offline
                      kutluyigitturk
                      wrote on last edited by
                      #14

                      @SGaist I did not install Qt on the Orange Pi. I installed it on my host computer.

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #15

                        That path /usr/local/qt5opi/ suggests a non standard installation. Hence it would be good to know how it was installed.

                        In any case, you have a cross-compiled Qt version on your host, correct ? If so, you should deploy it on your device so your application can use it.

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

                        K 1 Reply Last reply
                        0
                        • SGaistS SGaist

                          That path /usr/local/qt5opi/ suggests a non standard installation. Hence it would be good to know how it was installed.

                          In any case, you have a cross-compiled Qt version on your host, correct ? If so, you should deploy it on your device so your application can use it.

                          K Offline
                          K Offline
                          kutluyigitturk
                          wrote on last edited by kutluyigitturk
                          #16

                          @SGaist
                          What am I supposed to understand from this deployment process? How can I do the deploy process? By the way, I leave the youtube link I took as an example here, this is how I installed it.

                          https://youtu.be/TmtN3Rmx9Rk

                          If you watch the video, you will understand how I installed it. I'm a bit of a novice in these matters and solving this problem will add a lot to me.

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                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #17

                            Do you want to run your application on EGLFS or X11 like the video shows how to do ?

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

                            K 1 Reply Last reply
                            0
                            • SGaistS SGaist

                              Do you want to run your application on EGLFS or X11 like the video shows how to do ?

                              K Offline
                              K Offline
                              kutluyigitturk
                              wrote on last edited by
                              #18

                              @SGaist It makes no difference to me, I don't know the difference between the two? Is there a performance difference between the two?

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                              0
                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #19

                                The first one uses the hardware directly and does not provide windowing capabilities the other uses the Xorg server. Like most desktop installation (unless they run in Wayland).

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

                                K 1 Reply Last reply
                                0
                                • SGaistS SGaist

                                  The first one uses the hardware directly and does not provide windowing capabilities the other uses the Xorg server. Like most desktop installation (unless they run in Wayland).

                                  K Offline
                                  K Offline
                                  kutluyigitturk
                                  wrote on last edited by
                                  #20

                                  @SGaist The Project I've created aims to command GPIO pins. Which do you think would be better for me to do?

                                  JKSHJ 1 Reply Last reply
                                  0
                                  • K kutluyigitturk

                                    @SGaist The Project I've created aims to command GPIO pins. Which do you think would be better for me to do?

                                    JKSHJ Offline
                                    JKSHJ Offline
                                    JKSH
                                    Moderators
                                    wrote on last edited by
                                    #21

                                    @kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

                                    The Project I've created aims to command GPIO pins. Which do you think would be better for me to do?

                                    Does your project need a GUI?

                                    Since you are driving GPIO pins and you are running the application via SSH, that suggests to me that you don't need either EGLFS or X11. If that's the case, make your project a Console application instead of a GUI application -- then you won't need any of these GUI plugins.

                                    (see https://doc.qt.io/qtcreator/creator-project-creating.html and select "Qt Console Application" when you create a project)

                                    However, to make it a Console application, you must remove all GUI-related code (including Qt Quick) from your project.

                                    Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                                    K 1 Reply Last reply
                                    0
                                    • JKSHJ JKSH

                                      @kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

                                      The Project I've created aims to command GPIO pins. Which do you think would be better for me to do?

                                      Does your project need a GUI?

                                      Since you are driving GPIO pins and you are running the application via SSH, that suggests to me that you don't need either EGLFS or X11. If that's the case, make your project a Console application instead of a GUI application -- then you won't need any of these GUI plugins.

                                      (see https://doc.qt.io/qtcreator/creator-project-creating.html and select "Qt Console Application" when you create a project)

                                      However, to make it a Console application, you must remove all GUI-related code (including Qt Quick) from your project.

                                      K Offline
                                      K Offline
                                      kutluyigitturk
                                      wrote on last edited by
                                      #22

                                      @JKSH I aim to control the GPIO pins with the help of an interface. So "Qt Console Application" doesn't really solve my problem.

                                      I attach the video link I was inspired by,
                                      https://youtu.be/lh8lqtgzqYA

                                      JKSHJ 1 Reply Last reply
                                      0
                                      • K kutluyigitturk

                                        @JKSH I aim to control the GPIO pins with the help of an interface. So "Qt Console Application" doesn't really solve my problem.

                                        I attach the video link I was inspired by,
                                        https://youtu.be/lh8lqtgzqYA

                                        JKSHJ Offline
                                        JKSHJ Offline
                                        JKSH
                                        Moderators
                                        wrote on last edited by
                                        #23

                                        @kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

                                        I attach the video link I was inspired by,
                                        https://youtu.be/lh8lqtgzqYA

                                        Raspberry Pi is not Orange Pi.

                                        Your Orange Pi has Qt installed in /usr/local/qt5opi/. How did it get there? Did you install it, or does it come with the Orange Pi?

                                        If it comes with the Orange Pi, I suggest you ask the producers of Orange Pi for instructions on how to use their software distribution.

                                        Alternatively, try to force it to use the xcb plugin instead of the eglfs plugin and see what happens. From SSH, call ./OrangeDemlQml -platform xcb

                                        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                                        K 1 Reply Last reply
                                        1
                                        • JKSHJ JKSH

                                          @kutluyigitturk said in Could not find the Qt platform plugin "eglfs" in "":

                                          I attach the video link I was inspired by,
                                          https://youtu.be/lh8lqtgzqYA

                                          Raspberry Pi is not Orange Pi.

                                          Your Orange Pi has Qt installed in /usr/local/qt5opi/. How did it get there? Did you install it, or does it come with the Orange Pi?

                                          If it comes with the Orange Pi, I suggest you ask the producers of Orange Pi for instructions on how to use their software distribution.

                                          Alternatively, try to force it to use the xcb plugin instead of the eglfs plugin and see what happens. From SSH, call ./OrangeDemlQml -platform xcb

                                          K Offline
                                          K Offline
                                          kutluyigitturk
                                          wrote on last edited by
                                          #24

                                          @JKSH I am creating the folder named /qt5opi in the /usr/local directory. I create with this command, sudo mkdir /usr/local/qt5opi . You can see the same process when you open the 14th minute of the video.

                                          When I execute this command ./OrangeDemoQml -platform xcb I get a very similar error.

                                          ./OrangeDemoQml -platform xcb is the error I get when I execute this command:

                                          qt.qpa.xcb: could not connect to display 
                                          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
                                          This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                          
                                          Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.
                                          
                                          Aborted
                                          

                                          Errors I get after running export QT_DEBUG_PLUGINS=1

                                          QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5opi/plugins/platforms" ...
                                          QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqlinuxfb.so"
                                          Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqlinuxfb.so, metadata=
                                          {
                                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                              "MetaData": {
                                                  "Keys": [
                                                      "linuxfb"
                                                  ]
                                              },
                                              "archreq": 0,
                                              "className": "QLinuxFbIntegrationPlugin",
                                              "debug": false,
                                              "version": 331520
                                          }
                                          
                                          
                                          Got keys from plugin meta data ("linuxfb")
                                          QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqminimal.so"
                                          Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqminimal.so, metadata=
                                          {
                                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                              "MetaData": {
                                                  "Keys": [
                                                      "minimal"
                                                  ]
                                              },
                                              "archreq": 0,
                                              "className": "QMinimalIntegrationPlugin",
                                              "debug": false,
                                              "version": 331520
                                          }
                                          
                                          
                                          Got keys from plugin meta data ("minimal")
                                          QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqoffscreen.so"
                                          Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqoffscreen.so, metadata=
                                          {
                                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                              "MetaData": {
                                                  "Keys": [
                                                      "offscreen"
                                                  ]
                                              },
                                              "archreq": 0,
                                              "className": "QOffscreenIntegrationPlugin",
                                              "debug": false,
                                              "version": 331520
                                          }
                                          
                                          
                                          Got keys from plugin meta data ("offscreen")
                                          QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqvnc.so"
                                          Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqvnc.so, metadata=
                                          {
                                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                              "MetaData": {
                                                  "Keys": [
                                                      "vnc"
                                                  ]
                                              },
                                              "archreq": 0,
                                              "className": "QVncIntegrationPlugin",
                                              "debug": false,
                                              "version": 331520
                                          }
                                          
                                          
                                          Got keys from plugin meta data ("vnc")
                                          QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqwebgl.so"
                                          Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqwebgl.so, metadata=
                                          {
                                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                              "MetaData": {
                                                  "Keys": [
                                                      "webgl"
                                                  ]
                                              },
                                              "archreq": 0,
                                              "className": "QWebGLIntegrationPlugin",
                                              "debug": false,
                                              "version": 331520
                                          }
                                          
                                          
                                          Got keys from plugin meta data ("webgl")
                                          QFactoryLoader::QFactoryLoader() looking at "/usr/local/qt5opi/plugins/platforms/libqxcb.so"
                                          Found metadata in lib /usr/local/qt5opi/plugins/platforms/libqxcb.so, metadata=
                                          {
                                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                              "MetaData": {
                                                  "Keys": [
                                                      "xcb"
                                                  ]
                                              },
                                              "archreq": 0,
                                              "className": "QXcbIntegrationPlugin",
                                              "debug": false,
                                              "version": 331520
                                          }
                                          
                                          
                                          Got keys from plugin meta data ("xcb")
                                          QFactoryLoader::QFactoryLoader() checking directory path "/home/opi/platforms" ...
                                          loaded library "/usr/local/qt5opi/plugins/platforms/libqxcb.so"
                                          qt.qpa.xcb: could not connect to display 
                                          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
                                          This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                          
                                          Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.
                                          
                                          Aborted
                                          
                                          
                                          JKSHJ B 2 Replies Last reply
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