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I want to use a service that has a 2D array response
this is my .srv file
uint32 a
---
uint32[][] tree
catkin_make error:
genmsg.base.InvalidMsgSpec: invalid field: Currently only support 1-dimensional array types: uint32[][]
Well, the error says it all: two dimensional arrays are currently not supported.
I see two possibilities:
MultiArray message types in std_msgs.create your service similar to what e.g. sensor_msgs/Image is doing, by having a 1D array for the data and an additional parameter for the length of a row, i.e.
int32 a
---
uint32 step # Full row length in bytes
uint32[] data # actual matrix data, size is (step * rows)
I mean how to write it in server but I found this way
resp=stResponse()
resp.step = 7resp.data = cell #cell is an array in my server code
return resp
but I have another problem now: when I tried to print the received array in client it is printed as (1,2,3,4,..) not as the data that was assigned?
I did , thanks a lot :) and this the question if want to help http://answers.ros.org/question/23304...
Instead of a two-dimensional array, create a one-dimensional array by putting all rows "behind" each other. With the step field you define how long (either in bytes or you could also use number of elements) each row ist.
Does this answer your question? If not, I suggest you create a new question where you detail what exactly you don't understand...
Asked: 2016-04-26 14:54:59 -0500
Seen: 1,877 times
Last updated: Apr 27 '16
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