keyboard kernel events

keyboard_test.swift

import Foundation
import Cocoa

//@NSApplicationMain
class ApplicationDelegate: NSObject, NSApplicationDelegate {
    //  @IBOutlet var window: NSWindow!
    //  @IBOutlet private var text: NSTextField!
    private var timer: Timer?
    private var eventStrings: [String] = []
    private var counter: UInt64 = 0
    private var timestamp = NSDate().timeIntervalSince1970
    
    func applicationDidFinishLaunching(_: Notification) {
        //    window.level = NSWindow.Level.floating
        
        let options: NSDictionary = [kAXTrustedCheckOptionPrompt.takeRetainedValue() as NSString: true]
        if !AXIsProcessTrustedWithOptions(options) {
            print("Untrusted process!")
            return
        }
        
        NSEvent.addGlobalMonitorForEvents(
            matching: [NSEvent.EventTypeMask.keyDown, NSEvent.EventTypeMask.keyUp, NSEvent.EventTypeMask.flagsChanged],
            handler: { (event: NSEvent) in
                switch event.type {
                case .keyDown:
                    self.updateEventStrings(String(format: "keyDown %d", event.keyCode))
                case .keyUp:
                    self.updateEventStrings(String(format: "keyUp %d", event.keyCode))
                case .flagsChanged:
                    self.updateEventStrings(String(format: "flagsChanged %d", event.keyCode))
                default:
                    break
                }
            }
        )
    }
    
    func applicationWillTerminate(_: Notification) {}
    
    func applicationShouldTerminateAfterLastWindowClosed(_: NSApplication) -> Bool {
        return true
    }

    
    private func updateEventStrings(_ string: String) {
        print(string)
        print(NSDate().timeIntervalSince1970 - timestamp)
        timestamp = NSDate().timeIntervalSince1970

    }
}

let application = NSApplication.shared

let applicationDelegate = ApplicationDelegate()
application.delegate = applicationDelegate
application.activate(ignoringOtherApps: true)
application.run()