title: capturing incoming FIX messages which fail QuickFix validation
body: <p>A <a href="http://www.quickfixengine.org/" rel="nofollow">Quickfix</a> client validates incoming messages using <a href="http://www.quickfixengine.org/documentation" rel="nofollow">XML spec files</a>. If a message fails validation, quickfix automatically sends a rejection response. AFAIK in this case quickfix does not call the standard callback for incoming messages <code>fromApp()</code>, so up till now I was unable to programatically capture these erroneous incoming messages and handle them.</p>
  
  <p><strong>Is there a way to capture incoming FIX messages which fail quickfix validation?</strong></p>
  
  <p>Of course they may appear in the default quickfix log files, but I would rather capture them in my code in realtime.</p>