ROS Kinetic中使用rqt_graph遇PySide未定义符号错误求助

Hey there, let's tackle this undefined symbol error you're hitting with rqt_graph in ROS Kinetic. I've run into similar headaches before, so here are the most common fixes to work through step by step:

• Reinstall rqt_graph and its core dependencies
  Corrupted or incomplete package installations are a frequent culprit here. Run these commands to refresh the relevant packages:

  sudo apt-get update
  sudo apt-get install --reinstall ros-kinetic-rqt-graph ros-kinetic-rqt ros-kinetic-python-qt-binding
  

  This ensures all required libraries and binaries are properly installed and not missing critical symbols.

• Verify your ROS environment variables
  If you haven't sourced the ROS setup script correctly, rqt_graph might be trying to load libraries from the wrong place. Check if your environment is set up properly:

  1. In a new terminal, run:

     source /opt/ros/kinetic/setup.bash
     

  2. If you're using a custom catkin workspace, also source its setup file:

     source ~/catkin_ws/devel/setup.bash
     

  3. Confirm the paths are correct with:

     echo $ROS_PACKAGE_PATH
     

     You should see /opt/ros/kinetic/share and your workspace's devel/share listed.

• Clean ROS and catkin build caches
  Stale build artifacts or cached data can cause symbol mismatches. Clear these out and rebuild your workspace:

  1. Navigate to your catkin workspace:

     cd ~/catkin_ws
     

  2. Clean the build and devel directories (use catkin clean if you have catkin_tools installed, otherwise):

     rm -rf build devel
     

  3. Rebuild the workspace:

     catkin_make
     

  4. Also clear ROS's runtime cache:

     rm -rf ~/.ros/cache
     

• Fix Python version conflicts
  ROS Kinetic relies on Python 2.7, so if your system defaults to Python 3, this can break library bindings. Check your default Python version:

  python --version
  

  If it shows Python 3, force ROS to use Python 2 by setting the PYTHONPATH explicitly:

  export PYTHONPATH=/opt/ros/kinetic/lib/python2.7/dist-packages:$PYTHONPATH
  

  You can add this line to your ~/.bashrc file to make it permanent.

• Dig into the specific error message
  If none of the above works, look closely at the undefined symbol mentioned in your error. For example, if it's a Qt-related symbol, you might need to reinstall the Qt bindings for Python:

  sudo apt-get install --reinstall python-qt4
  

  Sharing the full error log would help narrow things down even further!

内容的提问来源于stack exchange，提问作者nag92