How to listen power button event in macOS?

Question

I have MacBook Air Retina(TouchID) and I need to listen power button pressing. How I do that?

I have tried this solution Listen for power button event in OS X but didn't work:

#include <iostream>
#include <CoreFoundation/CoreFoundation.h>

void
myCallBack(CFNotificationCenterRef center,
           void *observer,
           CFStringRef name,
           const void *object,
           CFDictionaryRef userInfo) {
    std::cout << "Power Button Pressed" << std::endl;
}

int
main(int argc, const char * argv[])
{
    CFNotificationCenterRef distCenter;
    CFStringRef evtName = CFSTR("com.apple.logoutInitiated");
    distCenter = CFNotificationCenterGetDistributedCenter();
    if (NULL == distCenter)
        return 1;
    CFNotificationCenterAddObserver(distCenter, NULL, &myCallBack, evtName, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
    CFRunLoopRun();
    return 0;
}

Do you need the actual power button, or will something like the `NSWorkspaceWillPowerOffNotification` work? — red_menace, Apr 06 '20 at 21:05
I think the power button on my Mac sends a `NSEventTypeSystemDefined` event with subtype `NSEventSubtypePowerOff`. — Willeke, Apr 08 '20 at 12:53

score 0 · Answer 1 · answered Apr 06 '20 at 20:27

0

That mentioned solution is obsolete. Try this event name:

CFStringRef evtName = CFSTR("com.apple.system.loginwindow.shutdownInitiated");

answered Apr 06 '20 at 20:27

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I give accesibility permission but nothing happened? Why – Emre Şenyuva Apr 06 '20 at 20:34
Try yet another "com.apple.loginwindow.shutdownInitiated". If it does not help, I don't have a clue. – 273K Apr 06 '20 at 20:51
Anyone figured this out? None of these seem to work. – c00000fd Apr 09 '23 at 18:52

How to listen power button event in macOS?

1 Answers1