Problem with ros::Timer [closed]

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Hello

I have trouble creating a timer in Ros. I defined a class in which one of its members is the timer callback. To create it, in the constructor of the class I put the following:

timer = nh.createTimer(ros::Duration(0.1), &summit_xl_path_planning::PathPlanningSpin, this);

("timer" is a ros::Timer member of the class)

And then define the callback as below:

void summit_xl_path_planning::PathPlanningSpin(const ros::TimerEvent& e)
{
...
}

Finally in the main summit_xl_path_planning I create a class, to make things work. I run the node using rosrun.

The problem is that I never get to run the timer. The program compiles. When I run everything I put in the constructor is done, but then nothing else happens. I have reviewed the tutorials thousands of times, but I can not see I'm doing wrong. Can anybody help?

I'm using Ubuntu 12.04 and Fuerte.

Thanks in advance and best regards