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How can I get my cout output on the console with roslaunch

asked 2011-03-17 21:29:16 -0600

Benoit Larochelle gravatar image

updated 2011-03-18 05:52:44 -0600

Why does only error output appear at the console when launching a ros node from roslaunch? Also, I can I force the normal behavior, so that I can see my cout output?

For example, I wrote this in a simple node:

std::cout << "cout" << std::endl;
std::cerr << "cerr" << std::endl;

If I call rosrun myNode myNode, I see the five lines. If I call roslaunch myNodeLauncher, I see only ROS_ERROR and std::cerr.

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answered 2011-03-17 21:38:30 -0600

KoenBuys gravatar image

In your Roslaunch XML add the following within your node tags:


You can always change the debug-level from RXconsole, select the node and change the level (rxloggerlevel).

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answered 2011-03-17 21:38:00 -0600

Ugo gravatar image


I'm not sure if you can see the std::cout when using roslaunch. To see all log messages (the one you print using ROS_INFO / ... ), you can use rxconsole.

Do you know about ROS_ERROR_STREAM / ROS_WARN_STREAM / ROS_INFO_STREAM ? It allows you to use a cout kind of syntax:

ROS_ERROR_STREAM("This is my index: " << i);

Hope this helps.

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Asked: 2011-03-17 21:29:16 -0600

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Last updated: Mar 17 '11