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);
	}
}