TrafficLights

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Configuration;

namespace TrafficLights
{
   public partial class TrafficLights : Form
   {
      #region DLLImports
      [DllImport("user32.dll")]
      static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo);
      [DllImport("user32.dll")]
      static extern bool SetKeyboardState(byte[] lpKeyState);
      [DllImport("user32.dll")]
      static extern bool GetKeyboardState(byte[] lpKeyState);
      #endregion DLLImports

      #region Constants
      const int VK_NUMLOCK = 0x90;
      const int VK_SCROLL = 0x91;
      const int VK_CAPITAL = 0x14;
      const int KEYEVENTF_EXTENDEDKEY = 0x1;
      const int KEYEVENTF_KEYUP = 0x2;
      #endregion

      #region Enums
      enum LEDType
      {
         NUMLOCK = 0x90,
         SCROLL = 0x91,
         CAPSLOCK = 0x14,
      }
      #endregion

      #region Variables
      LEDType m_sendLED = LEDType.NUMLOCK;
      LEDType m_receiveLED = LEDType.NUMLOCK;
      string m_adapter = "";
      PerformanceCounterCategory m_performanceCounterCategory;
      PerformanceCounter m_performanceCounterSent;
      PerformanceCounter m_performanceCounterReceived;
      Thread m_backGroundThread;
      //EventWaitHandle m_wh = new AutoResetEvent(false);
      #endregion

      public TrafficLights()
      {
         InitializeComponent();
         notifyIcon1.ShowBalloonTip(1);
      }

      private void TrafficLights_Load(object sender, EventArgs e)
      {
         this.Opacity = 0;

         m_sendLED = (LEDType)Enum.Parse(typeof(LEDType), Properties.Settings.Default.SendLED.ToString());
         m_receiveLED = (LEDType)Enum.Parse(typeof(LEDType), Properties.Settings.Default.ReceiveLED.ToString());
         m_adapter = Properties.Settings.Default.Adapter.ToString();
         m_performanceCounterCategory = new PerformanceCounterCategory("Network Interface");
         comboBoxAdapter.Items.AddRange(m_performanceCounterCategory.GetInstanceNames());
         comboBoxSendLED.Items.AddRange(Enum.GetNames(typeof(LEDType)));
         comboBoxSendLED.Text = m_sendLED.ToString();
         comboBoxReceiveLED.Items.AddRange(Enum.GetNames(typeof(LEDType)));
         comboBoxReceiveLED.Text = m_receiveLED.ToString();
         comboBoxAdapter.Text = m_adapter;

         Init();
      }

      void Init()
      {
         string instance;
         if (m_adapter == "")
            instance = m_performanceCounterCategory.GetInstanceNames()[0]; // 1st NIC !
         else
            instance = m_adapter;

         if (m_performanceCounterSent != null)
            m_performanceCounterSent.Dispose();
         if (m_performanceCounterReceived != null)
            m_performanceCounterReceived.Dispose();

         m_performanceCounterSent = new PerformanceCounter("Network Interface", "Bytes Sent/sec", instance);
         m_performanceCounterReceived = new PerformanceCounter("Network Interface", "Bytes Received/sec", instance);

         m_backGroundThread = new Thread(new ThreadStart(DoWork));
         m_backGroundThread.Start();
      }

      public void DoWork()
      {
         while (true)
         {            
            float fSentValue = m_performanceCounterSent.NextValue() / 1024;
            float fReceivedValue = m_performanceCounterReceived.NextValue() / 1024;
            if (fSentValue > 0)
            {
               keybd_event((byte)m_sendLED, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr)0);
               keybd_event((byte)m_sendLED, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr)0);
            }
            if (fReceivedValue > 0)
            {
               keybd_event((byte)m_receiveLED, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr)0);
               keybd_event((byte)m_receiveLED, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr)0);
            }
            //UpdateIcon(text);
            Thread.Sleep(50);
         }
      }

      void UpdateIcon(string text)
      {
         System.Resources.ResourceManager resources = new
                   System.Resources.ResourceManager(typeof(TrafficLights));
         Bitmap iconBmp = ((System.Drawing.Icon)(resources.GetObject
             ("notifyIcon1.Icon"))).ToBitmap();

         // Create an ImageGraphics Graphics object from bitmap Image
         System.Drawing.Graphics ImageGraphics = System.Drawing.Graphics.FromImage(iconBmp);

         // Draw random code within Image
         System.Drawing.Font drawFont = new System.Drawing.Font("Arial Narrow", 20, FontStyle.Regular);
         System.Drawing.SolidBrush drawBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);

         System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat();
         ImageGraphics.DrawString(text, drawFont, drawBrush, -2, 1, drawFormat);

         // Dispose used Objects

         drawFont.Dispose();
         drawBrush.Dispose();
         ImageGraphics.Dispose();
         //

         notifyIcon1.Icon = Icon.FromHandle(iconBmp.GetHicon());
         notifyIcon1.Text = text;
      }

      private void TrafficLights_FormClosed(object sender, FormClosedEventArgs e)
      {
         m_backGroundThread.Abort();
      }

      private void exitToolStripMenuItem_Click(object sender, EventArgs e)
      {
         Application.Exit();
      }

      private void buttonHide_Click(object sender, EventArgs e)
      {
         //m_wh.Reset();
         m_sendLED = (LEDType)Enum.Parse(typeof(LEDType), comboBoxSendLED.Text);
         m_receiveLED = (LEDType)Enum.Parse(typeof(LEDType), comboBoxReceiveLED.Text);
         m_adapter = comboBoxAdapter.Text;
         Properties.Settings.Default.SendLED = (byte)m_sendLED;
         Properties.Settings.Default.ReceiveLED = (byte)m_receiveLED;
         Properties.Settings.Default.Adapter = m_adapter;
         //m_wh.Set();
         Properties.Settings.Default.Save();

         Init();
         this.Opacity = 0;
      }

      private void configToolStripMenuItem_Click(object sender, EventArgs e)
      {
         this.Opacity = 100;
      }

      private void comboBoxSendLED_SelectedIndexChanged(object sender, EventArgs e)
      {
         //m_wh.Reset();
         //m_sendLED = (LEDType)Enum.Parse(typeof(LEDType), comboBoxSendLED.Text);
         //Properties.Settings.Default.SendLED = (byte)m_sendLED;
         //m_wh.Set();
         //Properties.Settings.Default.Save();
      }

      private void comboBoxReceiveLED_SelectedIndexChanged(object sender, EventArgs e)
      {
         //m_wh.Reset();
         //m_receiveLED = (LEDType)Enum.Parse(typeof(LEDType), comboBoxReceiveLED.Text);
         //Properties.Settings.Default.ReceiveLED = (byte)m_receiveLED;
         //m_wh.Set();
         //Properties.Settings.Default.Save();
      }

      private void comboBoxAdapter_SelectedIndexChanged(object sender, EventArgs e)
      {
         //m_wh.Reset();
         //m_adapter = comboBoxAdapter.Text;
         //Properties.Settings.Default.Adapter = m_adapter;
         //m_wh.Set();
         //Properties.Settings.Default.Save();
      }
   }
}