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You could load a yaml file from the Lauch File. Thereby your 'outside world' Programm could Specify the params by creating a yaml file and then Lauch the roslauch and Point it to the created yaml file that roslauch loads via rosparam load.....

You could load a yaml file from the Lauch File. Thereby your 'outside world' Programm could Specify the params by creating a yaml file and then Lauch the roslauch and Point it to the created yaml file that roslauch loads via rosparam load.....

Edit:

ros uses yaml-cp as stated here:

http://answers.ros.org/question/12321/how-to-write-and-parse-yaml-file-for-ros/

Link to yaml-cpp:

https://github.com/jbeder/yaml-cpp