qt.qpa.xcb: could not connect to display error

Dijkstra

i am getting this error when i ssh to another machine and try to run my qt app the only thing that removes this error is by remove the qcoreapplication variable and it return in the main function any help ?

JonB

@Dijkstra
Almost certainly you are not giving it a display to render to. DISPLAY environment variable for X11?

Dijkstra

what should i set the display to in the enviroment variables for it to work ?

JonB

@Dijkstra
To whatever X display you want it to use! Not my area, but I think export DISPLAY=0:0 is where to start from. But you'll have to Google the web to understand what you need.

SGaist

Hi,

@Dijkstra said in qt.qpa.xcb: could not connect to display error:

i am getting this error when i ssh to another machine and try to run my qt app the only thing that removes this error is by remove the qcoreapplication variable and it return in the main function any help ?

That is highly unlikely as QCoreApplication does not need any connection to the graphics server. Do you maybe have a QGuiApplication or just a QApplication ?

In any case, is it a command line application or does it have a GUI ?

JonB

@Dijkstra
If it is not a display issue as I had assumed, you can discover the cause by setting environment variable export QT_DEBUG_PLUGINS (this needs to be in the remote shell), running your program, and looking at the end of the diagnostic output.