Intercept Command-Quit in Mac App?

Question

I would like to make an app for Mac (Mavericks) that does not handle the command-quit option.

I found the following solution but it must be out of date because I get an error:

    CFMachPortRef eventTap = CGEventTapCreate(kCGHIDEventTap,
                                          kCGHeadInsertEventTap,
                                          kCGEventTapOptionDefault,
                                          CGEventMaskBit(kCGEventKeyDown),
                                          &KeyDownCallback,
                                          NULL);

CFRunLoopSourceRef runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
CFRelease(runLoopSource);
CGEventTapEnable(eventTap, true);

Another other ways? Thanks.

Answer 1

Just have your application delegate implement the applicationShouldTerminate: method:

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
    // work out whether to actually quit or not
    BOOL shouldQuit = /* insert logic here */;
    if (shouldQuit)
        return NSTerminateNow;
    else
        return NSTerminateCancel;
}