如何在应用程序关闭时执行代码？

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

    private const int WM_CLOSE = 0x0010;

    static void Main()
    {
        // 注册关闭事件
        Application.ApplicationExit += new EventHandler(Application_ApplicationExit);

        Application.Run(new Form1());
    }

    static void Application_ApplicationExit(object sender, EventArgs e)
    {
        // 执行关闭前的代码
        Console.WriteLine("Application is closing...");
    }
}

import Cocoa

@main
class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // 注册关闭事件
        NSApplication.shared.delegate = self
    }

    func applicationWillTerminate(_ aNotification: Notification) {
        // 执行关闭前的代码
        print("Application is closing...")
    }
}

window.addEventListener('beforeunload', function (e) {
    // 执行关闭前的代码
    console.log("Window is closing...");

    // 阻止默认行为（可选）
    e.preventDefault();
    e.returnValue = '';
});

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 执行关闭前的代码
        Log.d("MainActivity", "Activity is destroying...");
    }
}

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    deinit {
        // 执行关闭前的代码
        print("ViewController is being deallocated...")
    }
}

process.on('SIGINT', function() {
    console.log('Node.js app is closing...');
    process.exit();
});

import signal
import sys

def handle_exit(signum, frame):
    print('Python app is closing...')
    sys.exit(0)

signal.signal(signal.SIGINT, handle_exit)
signal.signal(signal.SIGTERM, handle_exit)

# 主程序逻辑