using System;

using System.ComponentModel;

using System.Runtime.InteropServices;

using System.Windows.Forms;

​

namespace ScrMaster

{

    public partial class MainForm : Form

    {

        private int uniqId = 1;

        private int ALT = 0x0001;

        private Keys key = Keys.PrintScreen;

​

        private bool canWork = true;

​

        Timer timer = new Timer();

​

        public MainForm()

        {

            timer.Tick += Timer_Tick;

            timer.Interval = 5_000;

​

            InitializeComponent();

        }

​

        private void Timer_Tick(object sender, EventArgs e)

        {

            canWork = true;

            timer.Stop();

        }

​

        private void MainForm_Load(object sender, EventArgs e)

        {

            SetHotKey();

​

            this.FormClosing += ClearHotKey;

        }

​

        private void SetHotKey()

        {

            RegisterHotKey(this.Handle, uniqId, (uint)ALT, (uint)key);

        }

​

        private void ClearHotKey(object sender, CancelEventArgs e)

        {

            UnregisterHotKey(this.Handle, uniqId);

        }

​

        #region Extern Dll

        [DllImport("user32.dll")]

        public static extern

           bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

​

        [DllImport("user32.dll")]

        public static extern

           bool UnregisterHotKey(IntPtr hWnd, int id);

        #endregion

​

        protected override void WndProc(ref Message keyPressed)

        {

            if (keyPressed.Msg == 0x0312)

            {

                if (canWork)

                {

                    switch (keyPressed.WParam.ToInt32())

                    {

                        case 1: SetPrtSc(); break;

                    }

                }

            }

            base.WndProc(ref keyPressed);

        }

​

        private void SetPrtSc()

        {

            canWork = !canWork;

            MessageBox.Show("");

            timer.Start();

        }

    }

}