Calling a callback function from another callback function [closed]

edit

Since your function takes a calibration_camera_lidar::Euler_val::ConstPtr as its argument, you should try to make one of those to pass in. Creating an object of that type should be similar (but maybe not quite the same) to the code that you would use to create and publish that message in the publisher.

boost::shared_ptr<calibration_camera_lidar::Euler_val> my_arr(new calibration_camera_lidar::Euler_val());
for ( int i=0; i<3; i++) {
    my_arr->Euler_angles[i] = i;
}
callback2(my_arr);

A quick walk-through:

    boost::shared_ptr<calibration_camera_lidar::Euler_val> my_arr(new calibration_camera_lidar::Euler_val());

Creates a shared_pointer to your message type, named my_arr, and initializes it my allocating a new object. Shared pointers are similar to regular pointers and use much of the same syntax, but they automatically delete the object that they're pointing to when the last shared pointer to that object is destructed.

for ( int i=0; i<3; i++) {
    my_arr->Euler_angles[i] = i;
}

Initialize each item in the array. Note that since my_arr is a shared pointer, you use the -> syntax to access its members. Since you declared the Euler_angles member as a fixed-size array, we can use the [] syntax with it. (if it was a variable-sized array, it would be a std::vector and would start at zero size, so you would need to use push_back or one of the other modifier functions to expand the array before putting an item on the end).

callback2(my_arr);

Call you callback!