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Unable to serialize Python list in message

asked 2016-10-17 08:56:55 -0500

Cerin gravatar image

How do you store a list of uints in a ROS message? I have a message like:

string frame
string type
uint8 quality
uint8[] a
uint8[] b
uint8[] c
uint8[] d
uint8   width
uint8   height
string data

but when I try to store:

mymsg.a = [1, 2]
mypub.publish(mymsg)

I get the error:

ROSSerializationException: field a[] exceeds specified width [uint8]

Why is this?

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answered 2018-12-02 09:35:04 -0500

ray30031 gravatar image

came across similar problem.

I think it is because python int is 64bit and you are putting it in a array of uint8.

try np.array([1,2]).astype(np.uint8)

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Asked: 2016-10-17 08:56:55 -0500

Seen: 148 times

Last updated: Dec 02 '18