C#读取QQWry.Dat文件实现IP查询

using System;  
using System.IO;  
using System.Collections;  
using System.Text;  
using System.Text.RegularExpressions;  
namespace PPTech.WebSite.BusinessRules  
{  
     /**//// <summary>  
     /// to scan the ip location from qqwry.dat  
     /// </summary>  
     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;  
         #endregion  
  
         构造函数#region 构造函数  
         public IPScaner()  
         {  
             //  
             // TODO: 在此处添加构造函数逻辑  
             //  
         }  
         #endregion  
  
         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;}  
         }  
         #endregion  
  
         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;  
             }  
  
         }  
         #endregion  
  
         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;  
         }  
         #endregion  
  
         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;  
         }  
         #endregion  
  
         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;  
         }  
         #endregion  
  
         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;  
         }  
         #endregion  
  
         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 " ";  
         }  
         #endregion  
  
         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();  
         }  
         #endregion  
  
         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;  
         }      
         #endregion  
  
         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;  
         }  
         #endregion  
  
          
     }  
}  
  
调用方式：  
             测试地址搜索#region 测试地址搜索  
             IPScaner objScan = new IPScaner();  
             string ip="221.224.205.13";  
             objScan.DataPath=@"E:\个人资料\IMTools\QQwryUpdate\QQWry.Dat";  
             objScan.IP=ip;  
             string addre=objScan.IPLocation();  
             string err=objScan.ErrMsg;  
  
             #endregion