下载CS文件：http://www.cnblogs.com/Files/rexsp/IPExport.rar
/**//******************************************************************
** File Name:IPExport.cs
** Copyright (c) 2004-2005 PPTech Studio(PPTech.Net)
** Creater:Rexsp(MSN:yubo@x263.net)
** Create Date:2004-12-29 20:10:28
** Modifier:
** Modify Date:
** Description:to export the ip location from qqwry.dat
** Version: IPExport 1.0.0
******************************************************************/
using System;
using System.Collections;
using System.Data;
using System.IO;
 
namespace PPTech.ESP.Component
{
    /**//// <summary>
    /// ExportData 的摘要说明。
    /// </summary>
    public class IPExport
    {
        私有成员#region 私有成员
        private string country;
        private string local;
        private FileStream objfs = null;
        private long startIp=0;
        private long endIp=0;
        private int countryFlag=0;
        private long endIpOff=0;
        #endregion
        
        构造函数#region 构造函数
        public IPExport()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        #endregion
 
        导出数据#region 导出数据
        public void SaveToText(string toFilePath,string fromFilePath)
        {
            objfs =  new FileStream(fromFilePath, FileMode.Open, FileAccess.Read);
            objfs.Position=0;
            byte[] buff1 = new Byte[8] ;
            objfs.Read(buff1,0,8);
            int firstStartIp=buff1[0]+buff1[1]*256+buff1[2]*256*256+buff1[3]*256*256*256;
            int lastStartIp=buff1[4]*1+buff1[5]*256+buff1[6]*256*256+buff1[7]*256*256*256;
            long recordCount=Convert.ToInt64((lastStartIp-firstStartIp)/7.0);
            if(recordCount<=1)
            {
                country="FileDataError";
                objfs.Close();
            }
            long rangE=recordCount;
            StreamWriter writer=File.AppendText(toFilePath);