title: How to detect WinPcap library installed or not?
body: <p>I use Pcap4j library to capture packet.</p>
  
  <p>If winpcap not installed, pcap4j only show some log, isn't throw exception.</p>
  
  <p>I can't know the library initialization failed.</p>
  
  <p>How to detect WinPcap library installed?</p>