Qt5 wayland gui application



  • Previously I was using Qt4 running with the -qws option.

    I have now changed to Qt5. As I understand it, qws is no longer a supported platform so I'm trying to run my gui application using the wayland compositor.

    I have included the Qt5 and qtwayland packages in my custom yocto build. I can run console applications but if I try use the -wayland specifier to run my gui application I get the folowing:

    root@beaglebone:~# ./bbb3 -platform wayland
    error: XDG_RUNTIME_DIR not set in the environment.
    Failed to create display (No such file or directory)

    Could someone point me in the right direction?

    Thanks.


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Did you took a look at the QtWayland Wiki Page ?

    Hope it helps



  • Thanks for the welcome and your quick response.

    After some research I discovered that I first need to run the weston compositor before running my application. I included the weston packages in my yocto build and ran it with the following commands:

    mkdir -p /tmp/$USER-weston
    chmod 0700 /tmp/$USER-weston
    export XDG_RUNTIME_DIR=/tmp/$USER-weston
    weston --tty=1 --backend=fbdev-backend.so &

    Then I successfully ran my QT5 gui application with the wayland platform specifier:

    ./myQt5App -platform wayland


  • Lifetime Qt Champion

    Nice ! Happy coding !


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