How to get values from a Json message

[Andrey_iv]

Hi,
I have a similar problem. How to get value from array?
{
  "dio" : {
    "do" : [ 0, 1, 0, 0, 0, 1, 0 ],
    "ro" : [ 0, 0, 0, 0, 0, 1, 0 ],
    "di" : [ 0, 0, 1, 0, 1, 0, 0, 0 ]
  }
}


I did this: dio/ro[0] (Error:No value for ro[0])