could not find qtplatfom plugin eglfs

Asha

Hi,

I build theqt for arm cross complier(beagleboneboard),
Os:debian
after that I installed qt and did kit configuration and all,
And running a simple application in qt but getting the error:

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.

16:11:26: Remote process crashed.

what is the mistake,I am not getting ,please suggest me to solve this issue ,
Thankyou.

SGaist

Hi,

Did you also deploy Qt in your target ?

Asha

@SGaist
Hi,

Thanks for the replay,

yes, i deployed on target also,using the scp command

scp -r Qt5ForBBB1 debian@192.168.7.2:Qt5ForBBB1.

Asha

@SGaist
Hi,

shall I ask, how to deploy the qt on target machine?

Asha

Here is my .pro file

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

The following define makes your compiler emit warnings if you use

any Qt feature that has been marked deprecated (the exact warnings

depend on your compiler). Please consult the documentation of the

deprecated API in order to know how to port your code away from it.

DEFINES += QT_DEPRECATED_WARNINGS

You can also make your code fail to compile if it uses deprecated APIs.

In order to do so, uncomment the following line.

You can also select to disable deprecated APIs only up to a certain version of Qt.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES +=
main.cpp
mainwindow.cpp

HEADERS +=
mainwindow.h

FORMS +=
mainwindow.ui

Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

Asha

@SGaist

I am giving the .pro file

target path = $$[Qt5ForBBB1]/bin
INSTALLS +=target

After this I run the application ,getting error like this

11:22:41: rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1207) [sender=3.1.3]

11:22:41: rsync failed with exit code 23.
11:22:41: Deploy step failed.
Error while building/deploying project bbb (kit: BBB)
When executing step "Deploy files via rsync"

Any suggestions...

SGaist

Did you copy the Qt folder at the exact same position you have on your desktop machine in your target ?

Asha

@SGaist

I have Qt folder ,in my laptop here /home/beagle/Qt5ForBBB1

And I copied,it just as like this

scp -r Qt5ForBBB1 debian@192.168.7.2:Qt5ForBBB1...

is it correct? or I need to copy like this

scp -r /home/beagle/Qt5ForBBB1 debian@192.168.7.2:Qt5ForBBB1

Ketank16

Even if you don't have the Qt folder on beaglebone at same location, you can export the following environment variables on BBB and be able to run your Qt application in it.

export QT_QPA_PLATFORM_PLUGIN_PATH=/home/debian/(Qt folder name)/plugins/platforms
export LD_LIBRARY_PATH="/home/debian/(Qt folder name)/lib":$LD_LIBRARY_PATH
export QT_PLUGIN_PATH=/home/debian/(Qt folder name)/plugins
export QT_QPA_FONTDIR=/home/debian/(Qt folder name)/lib/fonts

Main thing you need to check is do you have eglfs as platform in the first place? Because I'm working on a BBB myself, and my application isn't in critical need of eglfs, but normally with BBB sysroot and linaro toolchain combo, you don't get eglfs working. You should check the path /home/debian/(Qt folder name)/plugins/platforms before using any app whether you have a library for eglfs there. If you do, then the commands above will point the Qt application to right folder and it will detect eglfs as platform plugin.

Asha

@Ketank16

Hi,

I have the platforms

linuxfb, minimal, offscreen,and vnc,

And exported platform also
export_QT_QPA_PLATFORM=vnc(because i also have vnc)

As you said I already export those things,which you mentioned,

After that in .pro file added the line

target.path=$$[Qt5ForBBB]/bin
INSTALLS += target

After this, running the application, getting the error

rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1207) [sender=3.1.3]..

exactly same error i got in BBB folder(means I followed your pdf document, same as you said i created one BBB directory, and gave the command rsync -avz debian@192.168.7.2:/usr sysroot ,in there also i got same error,but I continued next process as you mentioned in your pdf along with this error)

how to solve this rsync error,please suggest me(even I am installed debian on external hard drive,and trying or following those steps in external hard drive,but while running this command rsync -avz debian@192.168.7.2:/usr sysroot,getting same error).

how do I solve this error?

SGaist

Why are you copying stuff in /usr ? The debian user likely doesn't have write access there.

Asha

@SGaist Hi,

then where i need to copy?

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

then where i need to copy?

Home directory of the user

Asha

@jsulm

rsync -avz debian@192.168.7.2:/usr sysroot

Here,I am synchronizing the sysroot from board to computer,

so,Home directory to the user means ,I need to give like this
rsync -avz debian@192.168.7.2:/usr /home/beagle/BBB/sysroot

OR

rsync -avz debian@192.168.7.2:/usr /home/beagle

jsulm

@Asha said in could not find qtplatfom plugin eglfs:

rsync -avz debian@192.168.7.2:/usr /home/beagle/BBB/sysroot
OR
rsync -avz debian@192.168.7.2:/usr /home/beagle

Well, if you use /home/beagle you will pollute your home directory with the sysroot content, so use /home/beagle/BBB/sysroot ...

Asha

@jsulm Hi,

After giving this,getting the same error,there is no changes..

Asha

@Ketank16 Hi,

can you please show me the, any .pro file,

I am very confused with this target.path file..

I followed this..

here is my .pro file target.pro.png

what i gave target.path, is it correct?

if its correct I am getting the error as shown in screenshot,

for that error solution ,I gave all the rights(rwx) to the /home/beagle/Qt5.13.1 directory then also getting the same error,any suggestions please....

Asha

Hi,

Any ideas?

Pablo J. Rogina

@Asha I think the problem is the $$[Qt5] placeholder in the value for target.path variable in your .pro
what if you just make it simple as target.path=/home/beagle/Qt5.13.1

PS: please STOP pasting pictures and just paste TEXT so it's easier for others to reference your posts...

Asha

@Pablo-J-Rogina

Good morning ,

Thanks for the replay,

After giving /home/beagle/Qt5.13.1 in my .pro file also getting the same problem...

Here is the compile output:

10:22:04: Running steps for project concentriccircles...
10:22:04: Configuration unchanged, skipping qmake step.
10:22:04: Starting: "/usr/bin/make" -j4
make: Nothing to be done for 'first'.
10:22:04: The process "/usr/bin/make" exited normally.
10:22:04: Connecting to device "Generic Linux Device" (192.168.7.2).
10:22:08: The remote file system has 49 megabytes of free space, going ahead.
10:22:08: Deploy step finished.
10:22:08: Trying to kill "/home/beagle/Qt5.13.1/concentriccircles" on remote device...
10:22:11: Remote application killed.
10:22:11: Deploy step finished.
10:22:11: Failed to create remote directories: mkdir: cannot create directory ‘/home/beagle’: Permission denied

10:22:11: Deploy step failed.
Error while building/deploying project concentriccircles (kit: BBB)
When executing step "Deploy files via rsync"
10:22:11: Elapsed time: 00:07.