Revision history [back]

I was able to get the expected result by updating the code as given below.

 int main(int argc, char *argv[])
 {  
       ros::init(argc, argv, "node_name");
       std::string param;
       ros::NodeHandle nh("~");
       std::string check;
       nh.getParam("param", check);
       cout << check << endl;
       ROS_INFO("Got parameter : %s", check.c_str());

        if(check.compare("blue") == 0)
        {
          cout << check << endl;
          blue();
        }
         else if(check.compare("greeen") == 0)
        {
          cout << check << endl;
          green();
        }
        else
        {
          cout << "Control has come out !!! " << endl;
        }  
        return 0;
  }

command to run rosrun package node_name _param:=blue rosrun package node_name _param:=green

I was able to get the expected result by updating the code as given below.

 int main(int argc, char *argv[])
 {  
       ros::init(argc, argv, "node_name");
       std::string param;
       ros::NodeHandle nh("~");
       std::string check;
       nh.getParam("param", check);
       cout << check << endl;
       ROS_INFO("Got parameter : %s", check.c_str());

        if(check.compare("blue") == 0)
        {
          cout << check << endl;
          blue();
        }
         else if(check.compare("greeen") == 0)
        {
          cout << check << endl;
          green();
        }
        else
        {
          cout << "Control has come out !!! " << endl;
        }  
        return 0;
  }

command to run

 rosrun package node_name _param:=blue
 rosrun package node_name _param:=green
 _param:=green