取IP地址所在城市

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.IO;

using System.Text;

using System.Text.RegularExpressions;

/// <summary>

///IpScaner 的摘要说明

/// </summary>

public class IpScaner

{

public class IPScaner

{

//私有成员#region 私有成员

private string dataPath;

private string ip;

private string country;

private string local;

private long firstStartIp = 0;

private long lastStartIp = 0;

private FileStream objfs = null;

private long startIp = 0;

private long endIp = 0;

private int countryFlag = 0;

private long endIpOff = 0;

private string errMsg = null;

//构造函数#region 构造函数

public IPScaner()

{

//

// TODO: 在此处添加构造函数逻辑

//

}

//公共属性#region 公共属性

public string DataPath

{

set { dataPath = value; }

}

public string IP

{

set { ip = value; }

}

public string Country

{

get { return country; }

}

public string Local

{

get { return local; }

}

public string ErrMsg

{

get { return errMsg; }

}

//搜索匹配数据#region 搜索匹配数据

private int QQwry()

{

string pattern = @"(((\d{1,2})|(1\d{2})|(2[0-4]\d)|(25[0-5]))\.){3}((\d{1,2})|(1\d{2})|(2[0-4]\d)|(25[0-5]))";

Regex objRe = new Regex(pattern);

Match objMa = objRe.Match(ip);

if (!objMa.Success)

{

this.errMsg = "IP格式错误";

return 4;

}

long ip_Int = this.IpToInt(ip);

int nRet = 0;

if (ip_Int >= IpToInt("127.0.0.0") && ip_Int <= IpToInt("127.255.255.255"))

{

this.country = "本机内部环回地址";

this.local = "";

nRet = 1;

}

else if ((ip_Int >= IpToInt("0.0.0.0") && ip_Int <= IpToInt("2.255.255.255")) || (ip_Int >= IpToInt("64.0.0.0") && ip_Int <= IpToInt("126.255.255.255")) || (ip_Int >= IpToInt("58.0.0.0") && ip_Int <= IpToInt("60.255.255.255")))

{

this.country = "网络保留地址";

this.local = "";

nRet = 1;

}

objfs = new FileStream(this.dataPath, FileMode.Open, FileAccess.Read);

try

{

//objfs.Seek(0,SeekOrigin.Begin);

objfs.Position = 0;

byte[] buff = new Byte[8];

objfs.Read(buff, 0, 8);

firstStartIp = buff[0] + buff[1] * 256 + buff[2] * 256 * 256 + buff[3] * 256 * 256 * 256;

lastStartIp = buff[4] * 1 + buff[5] * 256 + buff[6] * 256 * 256 + buff[7] * 256 * 256 * 256;

long recordCount = Convert.ToInt64((lastStartIp - firstStartIp) / 7.0);

if (recordCount <= 1)

{

country = "FileDataError";

objfs.Close();

return 2;

}

long rangE = recordCount;

long rangB = 0;

long recNO = 0;

while (rangB < rangE - 1)

{

recNO = (rangE + rangB) / 2;

this.GetStartIp(recNO);

if (ip_Int == this.startIp)

{

rangB = recNO;

break;

}

if (ip_Int > this.startIp)

rangB = recNO;

else

rangE = recNO;

}

this.GetStartIp(rangB);

this.GetEndIp();

if (this.startIp <= ip_Int && this.endIp >= ip_Int)

{

this.GetCountry();

this.local = this.local.Replace("（我们一定要解放台湾！！！）", "");

}

else

{

nRet = 3;

this.country = "未知";

this.local = "";

}

objfs.Close();

return nRet;

}

catch

{

return 1;

}

}

// IP地址转换成Int数据#region IP地址转换成Int数据

private long IpToInt(string ip)

{

char[] dot = new char[] { '.' };

string[] ipArr = ip.Split(dot);

if (ipArr.Length == 3)

ip = ip + ".0";

ipArr = ip.Split(dot);

long ip_Int = 0;

long p1 = long.Parse(ipArr[0]) * 256 * 256 * 256;

long p2 = long.Parse(ipArr[1]) * 256 * 256;

long p3 = long.Parse(ipArr[2]) * 256;

long p4 = long.Parse(ipArr[3]);

ip_Int = p1 + p2 + p3 + p4;

return ip_Int;

}

//int转换成IP#region int转换成IP

private string IntToIP(long ip_Int)

{

long seg1 = (ip_Int & 0xff000000) >> 24;

if (seg1 < 0)

seg1 += 0x100;

long seg2 = (ip_Int & 0x00ff0000) >> 16;

if (seg2 < 0)

seg2 += 0x100;

long seg3 = (ip_Int & 0x0000ff00) >> 8;

if (seg3 < 0)

seg3 += 0x100;

long seg4 = (ip_Int & 0x000000ff);

if (seg4 < 0)

seg4 += 0x100;

string ip = seg1.ToString() + "." + seg2.ToString() + "." + seg3.ToString() + "." + seg4.ToString();

return ip;

}

//获取起始IP范围#region 获取起始IP范围

private long GetStartIp(long recNO)

{

long offSet = firstStartIp + recNO * 7;

//objfs.Seek(offSet,SeekOrigin.Begin);

objfs.Position = offSet;

byte[] buff = new Byte[7];

objfs.Read(buff, 0, 7);

endIpOff = Convert.ToInt64(buff[4].ToString()) + Convert.ToInt64(buff[5].ToString()) * 256 + Convert.ToInt64(buff[6].ToString()) * 256 * 256;

startIp = Convert.ToInt64(buff[0].ToString()) + Convert.ToInt64(buff[1].ToString()) * 256 + Convert.ToInt64(buff[2].ToString()) * 256 * 256 + Convert.ToInt64(buff[3].ToString()) * 256 * 256 * 256;

return startIp;

}

// 获取结束IP#region 获取结束IP

private long GetEndIp()

{

//objfs.Seek(endIpOff,SeekOrigin.Begin);

objfs.Position = endIpOff;

byte[] buff = new Byte[5];

objfs.Read(buff, 0, 5);

this.endIp = Convert.ToInt64(buff[0].ToString()) + Convert.ToInt64(buff[1].ToString()) * 256 + Convert.ToInt64(buff[2].ToString()) * 256 * 256 + Convert.ToInt64(buff[3].ToString()) * 256 * 256 * 256;

this.countryFlag = buff[4];

return this.endIp;

}

//获取国家/区域偏移量#region 获取国家/区域偏移量

private string GetCountry()

{

switch (this.countryFlag)

{

case 1:

case 2:

this.country = GetFlagStr(this.endIpOff + 4);

this.local = (1 == this.countryFlag) ? " " : this.GetFlagStr(this.endIpOff + 8);

break;

default:

this.country = this.GetFlagStr(this.endIpOff + 4);

this.local = this.GetFlagStr(objfs.Position);

break;

}

return " ";

}

//获取国家/区域字符串#region 获取国家/区域字符串

private string GetFlagStr(long offSet)

{

int flag = 0;

byte[] buff = new Byte[3];

while (1 == 1)

{

//objfs.Seek(offSet,SeekOrigin.Begin);

objfs.Position = offSet;

flag = objfs.ReadByte();

if (flag == 1 || flag == 2)

{

objfs.Read(buff, 0, 3);

if (flag == 2)

{

this.countryFlag = 2;

this.endIpOff = offSet - 4;

}

offSet = Convert.ToInt64(buff[0].ToString()) + Convert.ToInt64(buff[1].ToString()) * 256 + Convert.ToInt64(buff[2].ToString()) * 256 * 256;

}

else

{

break;

}

}

if (offSet < 12)

return " ";

objfs.Position = offSet;

return GetStr();

}

//GetStr#region GetStr

private string GetStr()

{

byte lowC = 0;

byte upC = 0;

string str = "";

byte[] buff = new byte[2];

while (1 == 1)

{

lowC = (Byte)objfs.ReadByte();

if (lowC == 0)

break;

if (lowC > 127)

{

upC = (byte)objfs.ReadByte();

buff[0] = lowC;

buff[1] = upC;

System.Text.Encoding enc = System.Text.Encoding.GetEncoding("GB2312");

str += enc.GetString(buff);

}

else

{

str += (char)lowC;

}

}

return str;

}

//获取IP地址#region 获取IP地址

public string IPLocation()

{

this.QQwry();

return this.country; //+ this.local;

}

public string IPLocation(string dataPath, string ip)

{

this.dataPath = dataPath;

this.ip = ip;

this.QQwry();

return this.country;// + this.local;

}

}

}

调用：

protected void Page_Load(object sender, EventArgs e)

{

IpScaner.IPScaner objScan = new IpScaner.IPScaner();

string ip = Request.UserHostAddress.ToString();

objScan.DataPath = Server.MapPath("qqwry.dat");

objScan.IP = ip;

string addre = objScan.IPLocation();

string err = objScan.ErrMsg;

Response.Write(err);//地区

Response.Write(addre);//国家

}