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小编给大家分享一下通过IPIP.NET如何实现数据库查询IP地址,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
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IPIP所提供的数据库有付费和免费两个版本,我们可以直接使用其中的免费版本。
下载地址 https://www.ipip.net/download.html (需要先注册一个帐号)
压缩包内有一个PHP的解析类,还有一个 17monipdb.dat 文件就是数据库了,我们只需要用到它就可以了。
将 17monipdb.dat 复制到程序的主目录,使用下面的代码:
Imports System.IO Imports System.Text Public Class IPIP Shared offset As Integer Shared index As UInteger() = New UInteger(255) {} Shared dataBuffer As Byte() Shared indexBuffer As Byte() Shared lastModifyTime As Long = 0L Shared ipFile As String Shared rwlock As New Threading.ReaderWriterLock Shared Sub New() Load("17monipdb.dat") End Sub Shared Sub Load(ByVal filename As String) ipFile = New FileInfo(filename).FullName Load() End Sub Shared Sub Load() rwlock.AcquireWriterLock(-1) Dim fi As New FileInfo(ipFile) lastModifyTime = fi.LastWriteTime.Ticks Try dataBuffer = File.ReadAllBytes(fi.FullName) Dim indexLength = BytesToLong(dataBuffer(0), dataBuffer(1), dataBuffer(2), dataBuffer(3)) indexBuffer = New Byte(indexLength - 1) {} Array.Copy(dataBuffer, 4, indexBuffer, 0, indexLength) offset = CType(indexLength, Integer) For lp As Integer = 0 To 255 index(lp) = BytesToLong( _ indexBuffer(lp * 4 + 3), _ indexBuffer(lp * 4 + 2), _ indexBuffer(lp * 4 + 1), _ indexBuffer(lp * 4) _ ) Next Catch ex As Exception Throw ex End Try rwlock.ReleaseWriterLock() End Sub Private Shared Function BytesToLong(ByVal a As Byte, ByVal b As Byte, ByVal c As Byte, ByVal d As Byte) As UInteger Return (CType(a, UInteger) << 24) Or (CType(b, UInteger) << 16) Or (CType(c, UInteger) << 8) Or d End Function Shared Function Find(ByVal ip As String) As String() rwlock.AcquireReaderLock(-1) Dim ips = ip.Split(".") Dim ip_prefix_value = Integer.Parse(ips(0)) Dim ip2long_value As Long = BytesToLong(Byte.Parse(ips(0)), Byte.Parse(ips(1)), Byte.Parse(ips(2)), Byte.Parse(ips(3))) Dim start = index(ip_prefix_value) Dim max_comp_len = offset - 1028 Dim index_offset As Long = -1L Dim index_length As Integer = -1 Dim b As Byte = 0 start = start * 8 + 1024 While start < max_comp_len If BytesToLong(indexBuffer(start + 0), indexBuffer(start + 1), indexBuffer(start + 2), indexBuffer(start + 3)) >= ip2long_value Then index_offset = BytesToLong(b, indexBuffer(start + 6), indexBuffer(start + 5), indexBuffer(start + 4)) index_length = &HFF And indexBuffer(start + 7) Exit While End If start += 8 End While Dim areaBytes = New Byte(index_length - 1) {} Array.Copy(dataBuffer, offset + index_offset - 1024, areaBytes, 0, index_length) Dim ret As String() = Encoding.UTF8.GetString(areaBytes).Split(vbTab) rwlock.ReleaseReaderLock() Return ret End Function End Class
此代码是我从官方提供的C#版本翻译过来的,并且去除了一些冗余代码,只留下核心功能。
未经过完全的测试,有BUG请反馈给我。
使用方法很简单:
Dim ret = IPIP.Find("127.0.0.1" ' 用换行分隔所有信息 Dim ipdesc = String.Join(vbCrLf, ret)
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