title: ftd2xx.open creates always the device status FT_INVALID_HANDLE
body: <p>I try the to use ftd2xx library with Ubuntu. But always when I want to open the device, the received status is FT_INVALID_HANDLE.<br>
  Before I tried this with python I wrote a program in C which is working well. As library for both programs I use libftd2xx.so.1.3.6.</p>
  
  <pre><code>import ftd2xx as ft
  
  g = ft.open(0)
  g.status
  
  &gt;&gt; 1  #FT_INVALID_HANDLE
  </code></pre>
  
  <p>Why is the device status always FT_INVALID_HANDLE?</p>