How to know from where to import and the message type?

Custom_messages

asked 2016-11-28 20:53:55 -0500

kapoor_amita
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I am new to ROS, wanted to experiment with publishing and subscribing. The basic codes available are easy to run. Now let us say I have downloaded a package, My_Pkg, in its msg folder there is a file my_msg.msg where they have defined a message by name MSG.

My question is how do i publish or subscribe for this message: The simple statement : pub=rospy.Publisher('topic_name', MSG) Results in error that MSG is not defined. If I import: from My_Pkg.MSG import MSG Still error no module named Console.

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answered 2016-11-28 21:00:35 -0500

kapoor_amita
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Solved it: First Run rosmsg list, it will list all the messages, choose the one you were looking for so in above case it is simply: from my_pkg.msg import MSG and it works

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answered 2023-01-06 11:47:40 -0500

peci1

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With our cras_py_common library, it's actually quite easy:

from cras import get_msg_type
t = get_msg_type("sensor_msgs/Image")
print(t)
# prints <class 'sensor_msgs.msg._Image.Image'>

Install via sudo apt install ros-${ROS_DISTRO}-cras-py-common.

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How to know from where to import and the message type?

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