More on Keyboard Event posting

• Dave DeLong More on Keyboard Event posting Sep 29 2008, 17:25
  Hi everyone,
  
  I eventually figured out my previous problem with keyboard event
  posting when a colleague of mine pointed out the CGPostKeyboardEvent
  had been deprecated.  After digging around some more, we came up with
  the following:
  
  [window makeFirstResponder:textfield];
  CGEventSourceRef sourceRef =
  CGEventSourceCreate(kCGEventSourceStateCombinedSessionState);
  if (sourceRef == nil) { return; }
  //40 = "k"
  CGEventRef eventDown = CGEventCreateKeyboardEvent(sourceRef, 40, true);
  CGEventSetFlags(eventDown, kCGEventFlagMaskAlternate
  +kCGEventFlagMaskShift);
  CGEventRef eventUp = CGEventCreateKeyboardEvent(sourceRef, 40, false);
  CGEventPost(kCGAnnotatedSessionEventTap, eventDown);
  CGEventPost(kCGAnnotatedSessionEventTap, eventUp);
  CFRelease(eventDown);
  CFRelease(eventUp);
  CFRelease(sourceRef);
  
  Running that code will correctly produce an apple symbol in the
  TextField.  Other local commands that we send (Command-A, Command-C,
  Command-Q, etc) all work correctly.  Even shortcuts for Services work.
  
  However some keyevents, such as Command-Space to activate Quicksilver
  on my machine (usually Spotlight) or Shift-Command-3 to take a
  screenshot or Command-Tab to activate the application switcher, only
  produce a system beep.  Any ideas why and how we can get around that?
  
  We thought it might be the event source state used to create the
  CGEventSourceRef, but changing it to kCGEventSourceStateHIDSystemState
  or even kCGEventSourceStatePrivate did not produce the desired results.
  
  Any direction would be appreciated.
  
  Thanks,
  
  Dave
• Ken Thomases Re: More on Keyboard Event posting Sep 30 2008, 00:16
  On Sep 29, 2008, at 10:25 AM, Dave DeLong wrote:
  
  

  > However some keyevents, such as Command-Space to activate
  > Quicksilver on my machine (usually Spotlight) or Shift-Command-3 to
  > take a screenshot or Command-Tab to activate the application
  > switcher, only produce a system beep.  Any ideas why and how we can
  > get around that?
  >
  > We thought it might be the event source state used to create the
  > CGEventSourceRef, but changing it to
  > kCGEventSourceStateHIDSystemState or even kCGEventSourceStatePrivate
  > did not produce the desired results.
  

  
  I think the problem is the event tap point at which you're inserting
  the event.  Instead of kCGAnnotatedSessionEventTap, try
  kCGSessionEventTap or kCGHIDEventTap.
  
  Cheers,
  Ken
• Dave DeLong Re: More on Keyboard Event posting Sep 30 2008, 00:21
  Rock on!  Changing that eventTap to kCGHIDEventTap worked perfectly!
  
  Thank you so much!
  
  Dave
  
  On Sep 29, 2008, at 4:16 PM, Ken Thomases wrote:
  
  

  > On Sep 29, 2008, at 10:25 AM, Dave DeLong wrote:
  >
  >> However some keyevents, such as Command-Space to activate
  >> Quicksilver on my machine (usually Spotlight) or Shift-Command-3 to
  >> take a screenshot or Command-Tab to activate the application
  >> switcher, only produce a system beep.  Any ideas why and how we can
  >> get around that?
  >>
  >> We thought it might be the event source state used to create the
  >> CGEventSourceRef, but changing it to
  >> kCGEventSourceStateHIDSystemState or even
  >> kCGEventSourceStatePrivate did not produce the desired results.
  >
  > I think the problem is the event tap point at which you're inserting
  > the event.  Instead of kCGAnnotatedSessionEventTap, try
  > kCGSessionEventTap or kCGHIDEventTap.
  >
  > Cheers,
  > Ken
  >