Not Able to run Qt Application in BeagleBone Black with Qt 5.7

jsulm

@Milav Please read the "Creating the Application Package" part of the link I sent you.
There is a script you can use to start your application:

#!/bin/sh
appname=`basename $0 | sed s,\.sh$,,`

dirname=`dirname $0`
tmp="${dirname#?}"

if [ "${dirname%$tmp}" != "/" ]; then
dirname=$PWD/$dirname
fi
LD_LIBRARY_PATH=$dirname
export LD_LIBRARY_PATH
$dirname/$appname "$@"

Put all needed Qt libraries in the same directory as your executable. In addition you will need some plugins, so create a subdirectory "plugins" and put there needed plugins.

Milav

@jsulm hello,

The above error (error while loading shared libraries: libQt5Widgets.so.5) is solved. thanks a lot..
I just copy whole install directory (/usr/local/QT5.7.0) to Beagle Bone Black (/usr/local) path.

but when I again build the qt project, it will give following error.

stdin: is not a tty
This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "".

Available platform plugins are: linuxfb, minimal, offscreen.

Reinstalling the application may fix this problem.
bash: line 1: 2072 Aborted DISPLAY=':0.0' QWS_MOUSE_PROTO='LinuxInput:/dev/input/event1' /home/debian/Helloworldapp -qws
Application finished with exit code 134.

can you help me to resove this issues?

jsulm

@Milav said in Not Able to run Qt Application in BeagleBone Black with Qt 5.7:

eglfs

Does your Qt build have the eglfs plug-in? Plug-ins are in plugin subdirectory.

Milav

@jsulm no, there is not eglfs.so library file in installation directory(/usr/local/Qt5.7.0/plugnis/platforms/) of qt.

when i run application manually with ./App - platform linuxfb it is run but it gives following error

QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
QFontDatabase: Cannot find font directory /usr/local/Qt-5.7.0/lib/fonts.
Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.

which is needed platform for Beagle bone black debian Os? as per your knowledge?

what is the next step? to resolve this error?

jsulm

@Milav It looks like you need to provide the fonts as well, they should be located in /usr/local/Qt-5.7.0/lib/fonts according the warning. So copy them from your host Qt to /usr/local/Qt-5.7.0/lib/fonts on your target device.

Milav

@jsulm ..Hello,

I found inbuilt Fonts Directory of Qt5.7.0, but the result of that find is null.
than I download the fontconfig library (fontconfig-2.12.1)from external sources.
Than compile that library, and than it shows the fonts lib. in /usr/share/fonts .
and than copy this folder to target device in /usr/local/Qt5.7.0/lib/ path..
after doing this the above error was removed..but still i can not see the font in application.
what is the problem?

jsulm

@Milav said in Not Able to run Qt Application in BeagleBone Black with Qt 5.7:

i can not see the font in application

What do you mean? You cannot see any text in your application? Or you cannot select one of the fonts?

Milav

@jsulm
i cannot see any text in my application.....

jsulm

@Milav Which font does your application use? Is this font in /usr/local/Qt5.7.0/lib ?

Milav

@jsulm
I use "DejaVu Sans" font use in application.

and these fonts is available in this path:-
/usr/local/Qt-5.7.0/lib/fonts/truetype/ttf-dejavu

in that directroy ,
DejaVuSans-Bold.ttf DejaVuSansMono-Bold.ttf DejaVuSansMono.ttf DejaVuSans.ttf DejaVuSerif-Bold.ttf DejaVuSerif.ttf

files are stored.

jsulm

@Milav Try to print the content of the list returned by http://doc.qt.io/qt-5/qfontdatabase.html#applicationFontFamilies to the standard output and see what you get.

Milav

@jsulm
i will try http://doc.qt.io/qt-5/qfontdatabase.html#applicationFontFamilies , but still i can not see the text in qt application on Beaglebone black gui window...

still i miss some package of fonts in Beaglebone black.

can anyone suggest me for this package.?

Milav

Hello @jsulm

I just found that when i write the following command in build directory that enable the fontconfig , and XCB package....

#./configure -prefix /usr/local/qt_install

but when i use following command in build directory that disable the fontconfig and xcb package.

#./configure -prefix /usr/local/qt_install -xplatform linux-arm-gnueabihf -device linux-beagleboard-g++ -device-option CROSS_COMPILE=/opt/gcc-arm-linux/bin/arm-linux-gnueabihf-

so where is the problem?

jsulm

@Milav Most probably your sysroot does not contain header files and libraries for fontconfig and xcb. You can see what is missing by adding -v parameter to configure.

Milav

Hello ,

I added -sysroot in configuration command so that all header and libraries are to be added.

I used external SD card as a sysroot path. In SD card i use same image version as in target device image.

but this give me a following error...

Project ERROR: No module claims plugin type 'scenegraph'
make[4]: *** [sub-softwarecontext-make_first] Error 3
make[4]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d/src/plugins/scenegraph' make[3]: *** [sub-scenegraph-make_first] Error 2 make[3]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d/src/plugins'
make[2]: *** [sub-plugins-make_first] Error 2
make[2]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d/src' make[1]: *** [sub-src-make_first] Error 2 make[1]: Leaving directory /root/qt_build_23nov/qtdeclarative-render2d'
make: *** [module-qtdeclarative-render2d-make_first] Error 2

so where is the problem?

Milav

Hello @jsulm ,

I resolved the above error by adding the -opengl option in configure option.

Now I build the Qt 5.7.0 for BeagleBone Black.

but when I run the application for BBB, qt gives following error..

stdin: is not a tty
No protocol specified
QXcbConnection: Could not connect to display :0.0
bash: line 1: 1853 Aborted DISPLAY=':0.0' QWS_MOUSE_PROTO='LinuxInput:/dev/input/event1' /home/debian/QTapp -qws
Application finished with exit code 134.

so where is the problem?

jsulm

@Milav Are you running a X server on your device?

Andrey Shmelew

Hello to all!
I have exactly the same problem as above.
Host machine: VirtualBox Ubuntu 14.04 32 bit with Qt 5.5.1 installed on it
Device: BeagleBone Black with debian 8.4 on it.

So when i compile my Application for Desktop QT 5.5.1, it goes good,
but when i tried to upload my application on the Board, qt says:
stdin: is not a tty
bash: /home/root/coding: cannot execute binary file: Exec format error
Application ended with error code 126 (Приложение завершилось с кодом 126).
i used for this gcc (x86 32bit) compiler. i know that it's wrong compiler.

alt text

When i choose right (in my mind) compiler arm-linux-gnueabi-gcc, an error "ompiler cannot produce code"

alt text

Please see screenshots (sorry for cyrillic)

I am tying to crosscompile my app for beaglebone black for a weeks, please help me

Milav

@Andrey-Shmelew

you may be use wrong complier for the beagle bone black...

The host and Target specification are different from your specification.

I have 64 BIT bit Ubuntu on VMware and qt 5.7.0 is installed on that pc.
and i have Beagle Bone Black with debian 7.11 on it.

But i think cross-compiler toolchain is same for both of us...
so you can try with gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.xz version.

and please check that you installed the sources at the time of installation.

Let me know if any progress occur..

Milav

@jsulm

i dont know...

the LCD cape is connected on the BeagleBone black.

is this run on X-server?