title: Detect Hardware information in C++ application?
body: <p>I want to determine Hardware information like CPU, RAM, Hard Disk, GPU, etc.
  My application is in C++ but is built on Qt.
  How to get this information?
  Thank You.</p>
  
  <p><strong>EDIT:</strong> Looks like there is no platform independent way for this. So please can you list the code for prominent OS like Windows, OSX &amp; Ubuntu?</p>
  
  <p><strong>EDIT:</strong> I am talking about basic information like processor speed, amount of RAM available, hard disk speed, GPU speed &amp; memory.</p>