#include <ApplicationServices/ApplicationServices.h>
/*
* Time since last event for an event source.
*
* The kCGAnyInputEventType eventType will report the last timestamp
for any
* input event, keyboard, mouse, or tablet. The various system and
app
* defined events do not contribute to this event type's time.
*
* Again, a program or application posting from within a login
session should use
* the kCGEventSourceStateCombinedSessionState.
*
* A user space device driver interpreting hardware state and
generating events
* should use the kCGEventSourceStateHIDSystemState.
*/
CG_EXTERN CFTimeInterval CGEventSourceSecondsSinceLastEventType
( CGEventSourceStateID source, CGEventType eventType )
AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
Make sure you include that header above. Without the prototype, the
compiler will assume an integer return, which will have your code
reading the wrong register!
To determine how long it's been since your user's session received
any input from keyboard or mouse:
CFTimeInterval timeSinceLastEvent;
timeSinceLastEvent = CGEventSourceSecondsSinceLastEventType
(kCGEventSourceStateCombinedSessionState, kCGAnyInputEventType);
