title: QJsonObject returns null
body: <p>QJsonObject does not return values normally.</p>
  
  <p>json</p>
  
  <pre><code>{"response":{"header":{"resultCode":"0000","resultMsg":"OK"},"body":{"items":{"item":[{"baseDate":20190413,"baseTime":"0600","category":"PTY","nx":55,"ny":127,"obsrValue":0},{"baseDate":20190413,"baseTime":"0600","category":"REH","nx":55,"ny":127,"obsrValue":-998},{"baseDate":20190413,"baseTime":"0600","category":"RN1","nx":55,"ny":127,"obsrValue":0},{"baseDate":20190413,"baseTime":"0600","category":"T1H","nx":55,"ny":127,"obsrValue":6.3},{"baseDate":20190413,"baseTime":"0600","category":"UUU","nx":55,"ny":127,"obsrValue":0},{"baseDate":20190413,"baseTime":"0600","category":"VEC","nx":55,"ny":127,"obsrValue":0},{"baseDate":20190413,"baseTime":"0600","category":"VVV","nx":55,"ny":127,"obsrValue":0},{"baseDate":20190413,"baseTime":"0600","category":"WSD","nx":55,"ny":127,"obsrValue":0}]},"numOfRows":10,"pageNo":1,"totalCount":8}}}
  </code></pre>
  
  <p>Code</p>
  
  <pre><code>QJsonDocument jsonDoc = QJsonDocument::fromJson(reply-&gt;readAll());
          QJsonObject jsonObj = jsonDoc.object();
          QString status = jsonObj["resultMsg"].toString(); // empty
          QJsonArray items = jsonObj["item"].toArray();     // null
  </code></pre>
  
  <p>I expected OK to be stored in the status variable, but it did not contain anything.</p>
  
  <p>The items variable stores null.</p>