lockscreen.cs

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace LockScreenApp
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        const int SW_HIDE = 0;
        const int SW_SHOW = 5;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Set form ke mode full screen dan selalu di atas
            this.WindowState = FormWindowState.Maximized;
            this.FormBorderStyle = FormBorderStyle.None;
            this.TopMost = true;

            // Sembunyikan taskbar
            ShowWindow(this.Handle, SW_HIDE);

            // Tangkap event ketika pengguna mencoba mematikan komputer
            SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged;
        }

        private void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e)
        {
            if (e.Mode == PowerModes.Suspend)
            {
                // Cegah komputer masuk ke mode tidur
                e.Cancel = true;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // Tombol logout, kembalikan kontrol ke pengguna
            this.Close();
            ShowWindow(this.Handle, SW_SHOW); // Tampilkan kembali taskbar
        }
    }
}