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Hello
This is the code for publisher a string:
std_msgs::String msg;
std::stringstream ss;
ss << "hello world " << count;
msg.data = ss.str();
ROS_INFO("%s", msg.data.c_str());
chatter_pub.publish(msg);
If i want publisher an integer, other to sobstitute string with for example int8 what i can do?
It would be something like this:
#include <std_msgs/Int8.h>
std_msgs::Int8 msg;
msg.data = 17;
ROS_INFO("%d", msg.data);
chatter_pub.publish(msg);
as per above but dont forget to set the variable with: std_msgs::Int8 msg; before you start to use it.
when std_msgs::Int are getting passing from the param from launch file upto 127 number it takes the value as it is after that at number 128 it take it as -128 number because 127 8bit binary number is 1111111 and 128 binary number is 10000000 why this happens because it take 8th bit as negative bit.
bit if you use normal Int then it shows the number without any conversions.
Asked: 2013-01-31 08:47:40 -0500
Seen: 19,589 times
Last updated: Sep 02 '21
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