为了庆祝AIR正式版发布（不是正式版这个还做不了，不信你试试，哈）,在此献上AS3.0版本的读取QQwry.dat显IP地址所属地区程序。
教程目的: 熟悉AIR的文件操作方式(个人感觉类似c#,但没c#强大)，至于这个东东有什么用，我想不用我多说。
开始：
首先请各位先了解QQwry.dat的文件格式.个人认为这个地址讲的最好:http://www.cnblogs.com/tobylee/archive/2005/12/13/296362.html
下载QQwry.dat，大家上网上搜吧，６m左右
然后: 一个类
复制内容到剪贴板
代码:
package
{
public class IpInfo
{
public var ipBegin:Number;
public var ipOffset:Number;
public var ipEnd:Number;
}
}
AIR主程序
复制内容到剪贴板
代码:
import flash.filesystem.*;
private var file:File;
private var fileStream:FileStream;
private var ipIndexBeginOffSet:uint;
private var ipIndexEndOffSet:uint;
private var ipBlockCount:Number;
private var searchBeginIpInfo:IpInfo=new IpInfo();
private var searchEndIpInfo:IpInfo=new IpInfo();
private var searchMidIpInfo:IpInfo=new IpInfo();
private var searchBeginPos:uint;
private var searchEndPos:uint;
private function init():void
{
//注意QQWry.dat的地址
file=File.applicationDirectory.resolvePath("QQWry.dat");
fileStream=new FileStream();
fileStream.open(file,FileMode.READ);
fileStream.endian=Endian.LITTLE_ENDIAN;
var byteArr:ByteArray=new ByteArray();
fileStream.readBytes(byteArr,0,8);
ipIndexBeginOffSet=byteArr[0]+(byteArr[1]<<8)+(byteArr[2]<<16)+(byteArr[3]<<24);
ipIndexEndOffSet=byteArr[4]+(byteArr[5]<<8)+(byteArr[6]<<16)+(byteArr[7]<<24);
ipBlockCount=(ipIndexEndOffSet-ipIndexBeginOffSet)/7+1;
//设置二分查找法的头和尾
this.searchBeginPos=0;
this.searchEndPos=ipBlockCount-1;
//加这句，不然乱码
System.useCodePage=true;
//这里修改你要查找的ip地址
trace(searchIpInfo("218.240.16.20"));
}
//二分查找法搜索索引区
private function searchIpInfo(ip:String):String
{
var subIp:Number=ipToNumber(ip);
while (true)
{
//头
searchBeginIpInfo=getIpInfo(this.searchBeginPos);
//尾
searchEndIpInfo=getIpInfo(this.searchEndPos);
if (subIp>searchBeginIpInfo.ipBegin && subIp<searchBeginIpInfo.ipEnd)
return readAddressInfo(searchBeginIpInfo.ipOffset);
if (subIp>searchEndIpInfo.ipBegin && subIp<searchEndIpInfo.ipEnd)
return readAddressInfo(searchEndIpInfo.ipOffset);
searchMidIpInfo=getIpInfo((this.searchBeginPos+this.searchEndPos)/2)
if (subIp>searchMidIpInfo.ipBegin && subIp<searchMidIpInfo.ipEnd)
return readAddressInfo(searchMidIpInfo.ipOffset);
if (subIp>searchMidIpInfo.ipEnd)
{
this.searchBeginPos=(this.searchBeginPos+this.searchEndPos)/2;
}
else
{
this.searchEndPos=(this.searchBeginPos+this.searchEndPos)/2;
}
}
return "";
}
//读取该
private function readAddressInfo(pos:uint):String
{
var country:String="";
var area:String="";
var countryOffset:Number=0;
var tag:uint;
fileStream.position=pos+4;
//读取模式
tag=readTag();
if (tag==1)
{
//当模式为1的时候，指向改偏移地址
fileStream.position=getIpOffset();
tag=readTag();
//国家模式为2
if (tag==2)
{
countryOffset=getIpOffset();
area=this.readArea();
fileStream.position=countryOffset;
country=this.readString();
}
else
{
fileStream.position-=1;
country=this.readString();
area=this.readArea();
}
}
else if (tag==2)
{
//当模式为2的时候，指向改偏移地址
countryOffset=getIpOffset();
//先读取地区**
area=this.readArea();
//再读取国家
fileStream.position=countryOffset;
country=this.readString();
}
else
{
fileStream.position-=1;
country=this.readString();
area=this.readArea();
}
var address:String=country+" "+area;
return address;
}
//读取记录模式
private function readTag():uint
{
return fileStream.readByte();
}
//读取地区
private function readArea():String
{
var tag:uint=readTag();
if (tag==1 || tag==2)
{
fileStream.position=getIpOffset();
return readString();
}
else
{
fileStream.position-=1;
return readString();
}
}
//读取fileStream的数据
private function readString():String
{
var subOffset:uint=0;
var stringArr:ByteArray=new ByteArray();
stringArr[subOffset]=fileStream.readByte();
while (stringArr[subOffset]!=0)
{
subOffset++;
stringArr[subOffset]=fileStream.readByte();
}
return stringArr.toString();
}
//根据参数pos(记录点)读取改记录的起始ip,偏移地址和结束ip;
private function getIpInfo(pos:uint):IpInfo
{
fileStream.position=this.ipIndexBeginOffSet+7*pos;
var subIpInfo:IpInfo=new IpInfo();
subIpInfo.ipBegin=getIpNum();
subIpInfo.ipOffset=getIpOffset();
fileStream.position=subIpInfo.ipOffset;
subIpInfo.ipEnd=getIpNum();
return subIpInfo;
}
//读取ip地址
private function getIpNum():Number
{
var byteArr:ByteArray=new ByteArray();
fileStream.readBytes(byteArr,0,4);
//return byteArr[0]|(byteArr[1]<<8)|(byteArr[2]<<16)|(byteArr[3]<<24);
//return byteArr[0].toString()+(byteArr[1]<<8).toString()+
//(byteArr[2]<<16)+(byteArr[3]<<24);
return byteArr[0]+byteArr[1]*256+byteArr[2]*256*256+byteArr[3]*256*256*256;
}
//读取偏移地址
private function getIpOffset():Number
{
var byteArr:ByteArray=new ByteArray();
fileStream.readBytes(byteArr,0,3);
return byteArr[0]+byteArr[1]*256+byteArr[2]*256*256;
}
//ip转换为数值
private function ipToNumber(ip:String):uint
{
var ipArr:Array=ip.split(".");
if (ipArr.length==4)
{
var _n:uint=(uint(ipArr[0]<<24))+(uint(ipArr[1]<<16))+(uint(ipArr[2]<<8))+uint(ipArr[3]);
return _n;
}
else
{
return 0;
}
}
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