Form1.cs

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+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.Runtime.InteropServices;
+using System.IO;
+
+namespace TopMostWinChecker
+{
+	public partial class Form1 : Form
+	{
+		Timer m_timer;
+		int m_iHandle=0;
+
+
+
+		public Form1()
+		{
+			InitializeComponent();
+
+			m_timer = new Timer();
+			m_timer.Interval = 100;
+			m_timer.Tick += new EventHandler(TimerHandler);
+			m_timer.Start();
+		}
+
+		private void TimerHandler(object sender, EventArgs e)
+		{
+			int iHandle = GetForegroundWindow();
+
+			const int nChars = 256;
+			StringBuilder Buff = new StringBuilder(nChars);
+			if(GetWindowText(iHandle, Buff, nChars) > 0)
+			{
+				if(iHandle != m_iHandle)
+				{
+					string strCurTime = System.DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
+					ListViewItem item = new ListViewItem(new string[]{ Buff.ToString(), iHandle.ToString(), strCurTime });
+					lvList.Items.Add(item);
+
+					StreamWriter fp = null;
+					try
+					{
+						fp = new StreamWriter("save.txt", true);
+						fp.WriteLine("[" + strCurTime + "] " + Buff.ToString() + " (" + iHandle.ToString() + ")");
+					}
+					catch
+					{
+						MessageBox.Show("file save failed");
+					}
+					finally
+					{
+						if(fp != null)
+							fp.Close();
+					}
+				}
+			}
+
+			m_iHandle = iHandle;
+		}
+
+
+		[DllImport("user32.dll")]
+		static extern int GetForegroundWindow();
+
+		[DllImport("user32.dll")]
+		static extern int GetWindowText(int hWnd, StringBuilder text, int count);
+	}
+}