rqt rqt_image_view plugin problem

asked 2022-06-03 09:03:14 -0500

KevinZehou
3 ●3 ●4 ●5

updated 2022-06-03 09:15:45 -0500

Hello,

I am using ROS Noetic on Ubuntu 20.04LTS. I installed ROS and it's plugins using apt install. I am able to use all parts of ROS. The only problem is with rqt_image_view plugins. Other plugins of rqt are working well.

After i installed the full desktop version of ros noetic. I found this problem and i tried many ways to solve it. BUt is still can work. So I ran 'sudo apt-get install ros-noetic-rqt' to installed the rqt again , and i also ran 'sudo apt-get install ros-noetic-rqt-common-plugins' to installed the common plugins. To avoid omissions, i still ran 'sudo apt-get install ros-noetic-rqt-image-view'.

But when i ran "rqt_image_view ",

returns:

Could not import "pyqt" bindings of qt_gui_cpp library - so C++ plugins will not be available:
Traceback (most recent call last):
  File "/opt/ros/noetic/lib/python3/dist-packages/qt_gui_cpp/cpp_binding_helper.py", line 43, in <module>
    from . import libqt_gui_cpp_sip
ImportError: /home/zehou/.local/lib/python3.8/site-packages/PyQt5/Qt/lib/libQt5Core.so.5: version `Qt_5.12' not found (required by /opt/ros/noetic/lib/python3/dist-packages/qt_gui_cpp/libqt_gui_cpp_sip.so)

qt_gui_main() found no plugin matching "rqt_image_view/ImageView"
try passing the option "--force-discover"

It confused me for a long time !! Thank you for your answer !

answered 2022-06-03 18:02:47 -0500

Mike Scheutzow
4918 ●2 ●430 ●45

You appear to have not installed the libQt5 files using apt. The ros tools need those exact library versions.

You could delete the packages in $HOME/.local/lib/python3.8/ because they are probably interfering with your ros install. Doing this, of course, might break some other app, so you have to choose which is more important.

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Thanks for your answer. I have few questions: You said i did not install the libQt5 using apt, is libQt5 a package? Because when i ran 'sudo apt install libQt5' in the terminal, it return E: Unable to locate package libQt5.

The other question is, which packages in $HOME/.local/lib/python3.8/ i need to delete? I do not know which package have the influence on my ros install. Thank you !

KevinZehou ( 2022-06-03 21:50:23 -0500 )edit

libqt5 is an extensive GUI-building library used by many apps. It is split into a large number of apt packages, so I have no idea which ones you need. You can run apt search libqt5 to see the list. If you install a ros package usingapt, apt should install the needed libqt5 packages automatically.

Mike Scheutzow ( 2022-06-04 08:49:28 -0500 )edit

The other question is, which packages in $HOME/.local/lib/python3.8/

You have installed incompatible libraries. If you want to solve this problem quickly, delete them all (or move that python3.8 directory to $HOME, which is effectively the same as deleting the files.)

Mike Scheutzow ( 2022-06-04 10:35:59 -0500 )edit

Hi ! I copy the Pyhton3.8 directory into /HOME, but it return:

Could not find platform independent libraries <prefix> Could not find platform dependent libraries <exec_prefix> Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>] Python path configuration: PYTHONHOME = (not set) PYTHONPATH = '/home/zehou/catkin_ws/devel/lib/python3/dist-packages:/opt/ros/noetic/lib/python3/dist-packages' program name = '/usr/bin/python3' isolated = 0 environment = 1 user site = 1 import site = 1 sys._base_executable = '/usr/bin/python3' sys.base_prefix = '/usr' sys.base_exec_prefix = '/usr' sys.executable = '/usr/bin/python3' sys.prefix = '/usr' sys.exec_prefix = '/usr' sys.path = [ '/home/zehou/catkin_ws/devel/lib/python3/dist-packages', '/opt/ros/noetic/lib/python3/dist-packages', '/usr/lib/python38.zip', '/usr/lib/python3.8', '/usr/lib/lib-dynload', ]

KevinZehou ( 2022-06-05 05:16:26 -0500 )edit

So can i just installed the missing module again?

KevinZehou ( 2022-06-05 05:17:47 -0500 )edit

I do not know what your comment "it return" refers to. You wrote "copy" - this is wrong - I said "delete". After you delete that directory, you need to do a clean build in catkin_ws. Then yes, if something is still missing, install it, preferably using apt.

Mike Scheutzow ( 2022-06-05 06:55:43 -0500 )edit

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