OpenSuse "cannot connect X Server" error

umtkyck

I wrote simple console application It is working perfect but GUIs doesnt work.

SGaist

Then the question here is do you have a frame buffer device ? Something like /dev/fb0 ?

@ Gianluca qws was designed to run on system without X. The minimal requirement was a functional linux frame buffer. There were several plugins like e.g. DirectFB. So it might be used here if the minimal conditions are present.

umtkyck

Yeah SGaist I can see /dev/fb0.
is this means I have frame buffer , how can I run it

SGaist

Build Qt with the -embedded option like you did for ARM but don't cross-compile it. Then use that version of Qt to build your program and copy it on your target so that it will also be used there

umtkyck

I realized something that while I can configuring qt elsewhere 4.8.6 I only used "./configure".But Actually I didnt add -embedded prefix to configuration and maybe gui codes are tying to connect X server instead of Virtual Frame Buffer.I will reconfigure qt and then I will turn.
thanks.

SGaist

Don't forget to clean before you call configure again, you can also build several plugins at once e.g. the VFB and the linux frame buffer/DirectFB/what you need. It will avoid you to build them again later when you want to run your application on your target.

umtkyck

Hi,
SGAist , Which one do you suggest ? I thought to configure like "./configure -embedded i386".

umtkyck

I found something on net for "cannot connect X server "in below,

Solution:

Place the correct QT libraries on the embedded platform and specify the path using LD_LIBRARY_PATH (I havent tried this)
use -static switch in the QT library ./configure. This will pretent the executable from looking for the QT libraries. (I tried this and it works). However this will still ask for /lib/fonts, which i had to copy from the host environment.

I tried first one and problem still occurs.I couldnt understand second one how can I add "-static"?

SGaist

It will only work when you will be using an embedded version of Qt.

It will depend on your target OS either x86 or x86_64

umtkyck

Hi,
Before I try -embedded configure :
If I write "xinit ./calculator -qws" it works but when I try "./calculator -qws" it doesnt work cannot connect X server.
After -mbedded configure
"xinit ./calculator -qws" doesnt work too.

SGaist

As long as you are working on your desktop use the standard Qt. Once you are ready to test it on your target, compile your application with the embedded version and start that version on your board, provided you also put the embedded Qt libs in the right place on the target