title: Compress file with QuaZIP
body: <p>I'm looking for some example to zip files in Qt using QuaZIP.
  I tried this code but it doesn't work. I received a segmentation fault error.</p>
  
  <pre><code>JlCompress::compressFiles(zipfilename,filenames);//zipfilename is a qstring and filenames a QStringList
  </code></pre>
  
  <p>Should I open files before compressing them ?</p>