54onePiece

I also encountered a similar problem. I created the helloworld package under the src file, but it did not appear in the projects directory, and there was no Cmakelists file....

I reopened the document as you said, but it did not change anything. I installed the procedure in ubuntu20.0. The following figure shows the procedure I installed and the result...

I think the biggest problem is that it cannot generate the Cmakelists.txt and package.xml files as it should, at least I can’t find it

> Sorry, I am not understanding the question. Could you provide more information? I use ros_qtc_plugin to develop a program, and I need to use the action mechanism in ROS...

> Ah, so it stops there and never returns because most likely another node has not advertise the action you are waiting on. Bellow is a tutorial on setting up...

OK,I will try it. Thank you so much!

> If so, that is not good because it will freeze the application. I recommend creating an [event loop](https://doc.qt.io/qt-5/qeventloop.html) were inside this it checks if a connection is available but...

> If so, that is not good because it will freeze the application. I recommend creating an [event loop](https://doc.qt.io/qt-5/qeventloop.html) were inside this it checks if a connection is available but...