title: How to read a key value from JSON string?
body: <p>I want to read a value from a JSON String using JSONCPP. 
  Here is my JSON</p>
  
  <pre><code>{
      "action": "SCAN",
      "table": "Log",
      "rowLimit": "1000",
      "colFam": [
          "i"
      ],
      "filter": [
          {
              "op": "prefix",
              "cf_qn": "ROWKEYS",
              "val": "1#1404906729"
          }
      ],
      "rows": [
          {
              "rowNum": "1",
              "rowKey": "1#1404906729#",
              "cells": [
                  {
                      "qf": "i:appName",
                      "val": "TestApp"
                  },
                  {
                      "qf": "i:chBy",
                      "val": "Test Logger"
                  },
                  {
                      "qf": "i:comp",
                      "val": "TestMessageFromSDK"
                  },
                  {
                      "qf": "i:crDt",
                      "val": "07/12/2014 12:03:53"
                  },
                  {
                      "qf": "i:devId",
                      "val": "DevID1234"
                  },
                  {
                      "qf": "i:emailHash",
                      "val": "xyz@mail.com"
                  },
                  {
                      "qf": "i:epoch",
                      "val": "1404906729"
                  },
                  {
                      "qf": "i:groupId",
                      "val": "99999999"
                  },
                  {
                      "qf": "i:mcName",
                      "val": "Test-adev-w8"
                  },
                  {
                      "qf": "i:profId",
                      "val": "88888888"
                  },
                  {
                      "qf": "i:prty",
                      "val": "1"
                  },
                  {
                      "qf": "i:ts",
                      "val": "2014-07-12 11:52:01"
                  }
              ]
          }
      ],
      "stts": "Filters Set"
  }
  </code></pre>
  
  <p>I want to get <strong>"val": "TestMessageFromSDK"</strong> . </p>
  
  <p>How to do it ?</p>