Qt app doesn't run in vnc mode

[Charlie_Y]

I use vnc to connect the raspberry pi. I program an app by Qt on my PC. Then I copy the app to raspberry pi. I run the app by terminal. There is no error. But there is no graphic interface displayed on the raspberry pi (vnc window). I check the task manager. There is a process of my app.
I connect the display with HDMI. Then I run this app by vnc. The graphic interface is displayed in the display, but not on the vnc.
That's too strange. I really don't know how to solve it.

[ghans]

Most VNC servers spawn a different desktop session for each
connection. To get display :0 (the physical one) , use x11vnc.


ghans

[Charlie_Y]

Most VNC servers spawn a different desktop session for each
connection. To get display :0 (the physical one) , use x11vnc.


ghans

Thank you!
I enter vncserver :0 -geometry 800x600.
There is a warning,

Code: Select all

raspberrypi:0 is taken because of /tmp/.X0-lock
Remove this file if there is no X server raspberrypi:0
A VNC server is already running as :0

Then i remove the .X0-lock and try again.
There is also a warning,

Code: Select all

raspberrypi:0 is taken because of /tmp/.X11-unix/X0
Remove this file if there is no X server raspberrypi:0
A VNC server is already running as :0

I remove it and try again. start successfully.
But when I login to the raspberry pi by vnc(5900), the screen is full of gray. The mouse is a "X". I can't see the desktop.

another problem is that
When I start the raspberry pi, it alway start up the graphical interface automatically. I try to configure the boot option in raspi-config or edit the /etc/inittab. But it still start up the graphical interface automatically.

[ghans]

You need to use x11vnc instead of the VNC server you are
currently using.

ghans

[Charlie_Y]

You need to use x11vnc instead of the VNC server you are
currently using.

ghans

I connect raspberry pi successfully by 5900. But I still can not see my running app displayed in the vnc window.
I have to connect a display by HDMI to text my app.

[ghans]

Are you using hardware-accleration (OpenGL ES ?). You need the dipmanx_vnc server to display hardware-accelerated stuff remotely.

ghans

[Charlie_Y]

Are you using hardware-accleration (OpenGL ES ?). You need the dipmanx_vnc server to display hardware-accelerated stuff remotely.

ghans

Sorry，I don't understand what is dipmanx_vnc. I cannot search something about it on the internet. Can you tell me more about dipmanx_vnc? Thank you!

[AndrewS]

It was a typo https://www.google.co.uk/search?q=dispmanx_vnc

[DirkS]

Are you using hardware-accleration (OpenGL ES ?). You need the dipmanx_vnc server to display hardware-accelerated stuff remotely.

ghans

Sorry，I don't understand what is dipmanx_vnc. I cannot search something about it on the internet. Can you tell me more about dipmanx_vnc? Thank you!

That's a typo, it should be 'dispmanx_vnc'
BTW: Maybe you should change search engines; Google changed the search term straight away. So they got it right... at least this time