[Buildroot] Qt program with GUI issue

Eric Bénard eric at eukrea.com
Wed Oct 26 15:17:57 UTC 2011

Hi Yegor,

Le 26/10/2011 14:59, Yegor Yefremov a écrit :
> I'm trying to get my program integrated into BR. So far I managed to
> successfully build and install it, but as soon as I run it (with -qws
> option) I get trouble:
> GUI will be shown, but at the same time background/wallpaper goes green (I
> made nothing to make this happen). When I move my mouse, the pointer seems
> to draw over GUI, so that real gray background will show up at the places
> where mouse pointer went through.
> Is there any simple QT based project I could try to integrate as a
> reference? I tried CuteCom, but it is fully Qt4 compatible.
> Another issue if I don't supply -qws param, I get following error
> messages:
> QWSSocket::connectToLocalFile could not connect:: No such file or
> directory
> My system: ARM Cortex-A8 WindowsManager: Fluxbox
you are trying to run a qtembedded project (with its own graphic server)
in a windows manager running under X : this means both write to the
framebuffer leading to your problem (qt draws the interface and the green
background and when you move the mouse X refresh the area with it's content
(and thus fluxbox's one)).

The solution is :
- either to kill X and run your application with qws then that will work (you
may need to add some parameters in the environment variable QWS_MOUSE_PROTO 
for the input devices)
- either to compile your application with qt for X and run it under X (but I
think buildroot doesn't support QT for X so you are on your own here)


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