/// <summary>
/// 获取Ip对应的地址
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
public static string GetIpAddress(string ip)
{
IPLocation ipLocation = SearchLocation(ip);
if (ipLocation == null)
{
return("");
}
else
{
return(string.Format("{0}{1}", ipLocation.Country, ipLocation.Area));
}
}
/// <summary>
/// 读取位置
/// </summary>
/// <param name="offset">偏移量</param>
/// <returns></returns>
private static IPLocation ReadIPLocation(long offset)
{
IPLocation ipLocation = new IPLocation();
_ipdatefile.Position = offset + 4;
byte flag = (byte)_ipdatefile.ReadByte();
if (flag == MODE1)
{
long countryOffset = ReadByte3();
_ipdatefile.Position = countryOffset;
flag = (byte)_ipdatefile.ReadByte();
if (flag == MODE2)
{
ipLocation.Country = ReadString(ReadByte3());
_ipdatefile.Position = countryOffset + 4;
}
else
{
ipLocation.Country = ReadString(countryOffset);
}
ipLocation.Area = ReadArea(_ipdatefile.Position);
}
else if (flag == MODE2)
{
ipLocation.Country = ReadString(ReadByte3());
ipLocation.Area = ReadArea(offset + 8);
}
else
{
ipLocation.Country = ReadString(--_ipdatefile.Position);
ipLocation.Area = ReadString(_ipdatefile.Position);
}
return(ipLocation);
}
/// <summary>
/// 读取位置
/// </summary>
/// <param name="offset">偏移量</param>
/// <returns></returns>
private static IPLocation ReadIPLocation(long offset) {
IPLocation ipLocation = new IPLocation();
_ipdatefile.Position = offset + 4;
byte flag = (byte)_ipdatefile.ReadByte();
if (flag == MODE1) {
long countryOffset = ReadByte3();
_ipdatefile.Position = countryOffset;
flag = (byte)_ipdatefile.ReadByte();
if (flag == MODE2) {
ipLocation.Country = ReadString(ReadByte3());
_ipdatefile.Position = countryOffset + 4;
}
else {
ipLocation.Country = ReadString(countryOffset);
}
ipLocation.Area = ReadArea(_ipdatefile.Position);
}
else if (flag == MODE2) {
ipLocation.Country = ReadString(ReadByte3());
ipLocation.Area = ReadArea(offset + 8);
}
else {
ipLocation.Country = ReadString(--_ipdatefile.Position);
ipLocation.Area = ReadString(_ipdatefile.Position);
}
return ipLocation;
}