title: How to find the corresponding key value from the string inserted into a QMap?
body: <p>I have the following data structure. </p>
  
  <pre><code>QMap&lt;int,QString&gt; map;
  
  map.insert(0x01,"HELLO");
  map.insert(0x02,"FELLOW");
  map.insert(0x83,"NESTLE");
  map.insert(0x044,"KITKAT");
  
  QString str="NESTLE";
  </code></pre>
  
  <p>My requirement is to retrieve the value -0x83 when the string - NESTLE is passed.
  Basically, based on str value, I want to get the corresponding key value i.e. 0x83 in this example. How can I do so?</p>