#import <CoreGraphics/CoreGraphics.h>
#import <CoreFoundation/CoreFoundation.h>

static int counter = 0;

CGEventRef myCGEventCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {

    printf("event 0x%in ", counter++);

    return event;
}


int main(int argc, const char * argv[]) {


    CFRunLoopRef runner = CFRunLoopGetCurrent();





    CFMachPortRef mach = CGEventTapCreate(kCGEventSourceStateHIDSystemState,kCGTailAppendEventTap , kCGEventTapOptionDefault, kCGEventMaskForAllEvents, myCGEventCallback, NULL);


    CFRunLoopSourceRef runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, mach, 0);

    CFRunLoopAddSource(runner, runLoopSource, kCFRunLoopCommonModes);

    CGEventTapEnable(mach, true);


    CFRunLoopRun();

    printf("endn");



}