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One solution found!

I found out that by shutting ( with SIGINT)

I found solution for this by creating a SIGINT handler in my node WITHOUT ros::shutdown() call but with a global variable set to True that is checked by my while loop. More about SIGINT handler in ROS: (http://wiki.ros.org/roscpp/Overview/Initialization%20and%20Shutdown).

In my Qt app I kill the node with kill(scanProces->processId(), SIGINT) command. Now QProcess.start(""kill -SIGINT " + QString::number(scanProcess->processId())) should also work.

I don't know if this is good way to handle this, but it seem to work!

So what I have in my node is this:

#include <ros/ros.h>
#include <signal.h>

bool exit = false
void mySigintHandler(int sig)
{
  // Do some custom action.
  // For example, publish a stop message to some other nodes.

  exit = true

}

int main(int argc, char** argv)
{
  ros::init(argc, argv, "my_node_name", ros::init_options::NoSigintHandler);
  ros::NodeHandle nh;

  // Override the default ros sigint handler.
  // This must be set after the first NodeHandle is created.
  signal(SIGINT, mySigintHandler);


  while (ros::ok & !exit)
   {
       ros::spinOnce() 
   }
  return 0;
}

If someone more knowledgeable can tell the root problem of this and if my solution is ok, please enlighten me!