ios - How to downcast AnyObject to pid_t -

I'm trying to get pid_t of using a specific window (CGWindowListCopyWindowInfo). After fighting the casting of the Swift, the end of the window can be obtained Onrpiaidi

  var window Onrpiaidiarf = Siafafeediaget value (Vindoinforaf, unsecured Adedof (Kesijiwaindo Onrpiaidi)) Version window Oinder PID = insecure bit Cast (window Onrpiaidiaraf, Oobakt.af)  AXUIElement = AXUIElementCreateApplication (testPid) .takeRetainedValue ()  
 now I Smar to windowOwnerPID cast variables AnyObject Oh 
 
  var need to pid_t to feed appRef>  
 But it does not know how to do. Anyone have experience with this issue?   
 
 
 According to,  value kCGWindowOwnerPID  key  CFNumberRef for < / Code> type ( kCFNumberIntType  as encoded) that contains the application ID of the application that owns the window. 
 
 CoreFoundation Using toll- free bridging between the foundation types and Foundation and swift way, should do the following: 
 
  letlist = CGWindowListCopyWindowInfo (CGWindowListOption (kCGWindowListOptionScreenOnly ), 0) .takeRetainedValue () as a list of wdict [[string: Onobaj]] {that's as PD = wdict [kCGWindowOwnerPID]? Int {println (pid) // pid is an int here. If necessary, pid = pid_t (pid)}}  
 
 The Convert pid_t (so with  unsecured know ()  and  unprotected bitcast ()  Swift 1.2 (Xcode 6.3 beta)  string  CFStringRef  requires> with a clear conversion (thanks to Rob for not required ). 
 
 reaction Napier): 
 
  to wlist = CGWindowListCopyWindowInfo (CGWindowListOption (kCGWindowListOptionOnScreenOnly), 0) as (.takeRetainedValue to wdict in wlist to)! [[String: Oibbad]] {if Pwyd = Vadikt [String (KCG windowOnPID)] as? Int {println (pid)}}