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The solution is to change if condition as the following:

if (argc < 2)
     {
        ROS_WARN("WARNING: you should specify camera info properties!");
     }else{
         ROS_INFO("INFO: you have set camera properties file: %s\n",argv[1]);
         camera_info_file=g_string_new(argv[1]);
     }

Because when ROS add 2 further arguments to the node if you start it from the launch file. (I mean two arguments more than the basic rosnode command).

Note: the added arguments are put at the end of the other arguments, see the following example:

ARGUMENT 0: /home/aldo/Projects/4thRC/BergamoComponents/gscam/bin/gscam
ARGUMENT 1: /home/aldo/Projects/4thRC/BergamoComponents/services_caller/camera_parameters_to_set.txt
ARGUMENT 2: __name:=gscam
ARGUMENT 3: __log:=/home/aldo/.ros/log/a197a76e-178d-11e2-aec0-00225f3a69a4/gscam-6.log

The solution is to change if condition as count the following:

number of arguments after ros::init :
ros::init(argc, argv, "gscam_publisher");
    if (argc < != 2)
      {
         ROS_WARN("WARNING: you should specify camera info properties!");
      }else{
          ROS_INFO("INFO: you have set camera properties file: %s\n",argv[1]);
          camera_info_file=g_string_new(argv[1]);
     }

Because when ROS add 2 further arguments to the node if you start it from the launch file. (I mean two arguments more than the basic rosnode command).

ARGUMENT 0: /home/aldo/Projects/4thRC/BergamoComponents/gscam/bin/gscam
ARGUMENT 1: /home/aldo/Projects/4thRC/BergamoComponents/services_caller/camera_parameters_to_set.txt
ARGUMENT 2: __name:=gscam
ARGUMENT 3: __log:=/home/aldo/.ros/log/a197a76e-178d-11e2-aec0-00225f3a69a4/gscam-6.log

The solution is to count the number of arguments after ros::init : :

ros::init(argc, argv, "gscam_publisher");
    if (argc != 2)
         {
            ROS_WARN("WARNING: you should specify camera info properties!");
         }else{
             ROS_INFO("INFO: you have set camera properties file: %s\n",argv[1]);
             camera_info_file=g_string_new(argv[1]);
         }
}

Because ROS add 2 further arguments to the node if you start it from the launch file. (I mean two arguments more than the basic rosnode command).