PyObjC keyboard event sniffer for MacOS

keysniffer.py

# A simple PyObjC keyboard event sniffer.

# You don't want to import everything from Quartz - this slows things down significantly
from Quartz import                  \
    CGEventTapCreate,               \
    kCGHIDEventTap,                 \
    kCGHeadInsertEventTap,          \
    kCGEventTapOptionListenOnly,    \
    kCGEventKeyDown,                \
    CFMachPortCreateRunLoopSource,  \
    CFRunLoopAddSource,             \
    CFRunLoopGetCurrent,            \
    kCFRunLoopDefaultMode,          \
    CGEventTapEnable,               \
    CFRunLoopRun,                   \
    CGEventMaskBit,                 \
    CGEventGetTimestamp,            \
    CGEventKeyboardGetUnicodeString,\
    CGEventGetIntegerValueField,    \
    CGEventGetFlags,                \
    kCGEventKeyUp,                  \
    kCGEventFlagsChanged

def handleKeyEvent(p, t, ev, c):
    timestamp = CGEventGetTimestamp(ev)
    target_pid = CGEventGetIntegerValueField(ev, 40)
    kb_ident = CGEventGetIntegerValueField(ev, 10)
    flags = CGEventGetFlags(ev)
    keycode = CGEventGetIntegerValueField(ev, 9)
    if t == 10 or t == 11:
        # Keyup and Keydown events
        if t == 10:
            ev_type = "KeyDown"
        else:
            ev_type = "KeyUp"
        uni_string = CGEventKeyboardGetUnicodeString(ev, 10, None, None)[1]
        is_repeat = CGEventGetIntegerValueField(ev, 8)
        print(f"{ev_type},{timestamp},{keycode},{kb_ident},{is_repeat},{format(flags,'08x')},{uni_string}")
    elif t == 12:
        # Flag change events
        ev_type = "FlagsChanged"
        keycode = CGEventGetIntegerValueField(ev, 9)
        print(f"{ev_type},{timestamp},{keycode},{kb_ident},{format(flags,'08x')}")

tap = CGEventTapCreate(
    kCGHIDEventTap,
    kCGHeadInsertEventTap,
    kCGEventTapOptionListenOnly,
    CGEventMaskBit(kCGEventKeyDown) | CGEventMaskBit(kCGEventKeyUp) | CGEventMaskBit(kCGEventFlagsChanged),
    handleKeyEvent,
    None
)

runLoopSource = CFMachPortCreateRunLoopSource(None, tap, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopDefaultMode);
CGEventTapEnable(tap, True);

CFRunLoopRun();