使用VB.net获取计算机的本地IPv4

Question

我正在尝试获取本地PC的ip地址，而我的另一台PC可以很好地获取v4地址，但在这台PC上，代码是：

Dns.GetHostEntry(Dns.GetHostName).AddressList(0).ToString()

返回我认为是IPv6地址的内容：

fe80::9c09:e2e:4736:4c62%11

如何获取IPv4地址？

Answer 1

免责声明-我没有安装IPv6，可能有一种更好的方法来实现此目的，但以下返回的内容是什么：

Dns.GetHostEntry(Dns.GetHostName()).AddressList
    .Where(a => !a.IsIPv6LinkLocal && !a.IsIPv6Multicast && !a.IsIPv6SiteLocal)
    .First()
    .ToString();

编辑-没有注意到你在VB中提问，所以我试着把它翻译成：

Dim s As String = Dns.GetHostEntry(Dns.GetHostName()).AddressList _
    .Where(Function(a As IPAddress) Not a.IsIPv6LinkLocal AndAlso Not a.IsIPv6Multicast AndAlso Not a.IsIPv6SiteLocal) _
    .First() _
    .ToString()

这可能会失败，所以不要把它当作产品代码。

Answer 2

我的解决方案是在不使用外部服务的情况下获得可路由的IPv4 IP：

  Function GetLocalIP() As String
    Dim IPList As System.Net.IPHostEntry = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName)

    For Each IPaddress In IPList.AddressList
      'Only return IPv4 routable IPs
      If (IPaddress.AddressFamily = Sockets.AddressFamily.InterNetwork) AndAlso (Not IsPrivateIP(IPaddress.ToString)) Then
        Return IPaddress.ToString
      End If
    Next
    Return ""
  End Function

  Function IsPrivateIP(ByVal CheckIP As String) As Boolean
    Dim Quad1, Quad2 As Integer

    Quad1 = CInt(CheckIP.Substring(0, CheckIP.IndexOf(".")))
    Quad2 = CInt(CheckIP.Substring(CheckIP.IndexOf(".") + 1).Substring(0, CheckIP.IndexOf(".")))
    Select Case Quad1
      Case 10
        Return True
      Case 172
        If Quad2 >= 16 And Quad2 <= 31 Then Return True
      Case 192
        If Quad2 = 168 Then Return True
    End Select
    Return False
  End Function

请注意，我的代码还在验证该范围是否可路由(IsPrivateIP)。如果您正在寻找其他内容，则可以删除或修改该部分。

Answer 3

我使用了Cmd/Visual Basic的组合代码，它起作用了：

    Dim ResString As String = "result.txt"

    If File.Exists("result.txt") Then
        File.Delete("result.txt")
    End If

    Shell("cmd.exe /c  cd " & Application.StartupPath & " && ipconfig >> " & ResString & "&& exit", AppWinStyle.NormalFocus)

    Dim Ipv4 As String
    Dim Ipv4Found As Boolean = False
    Dim Ipv4Char As Integer = 43
    Dim Ipv4Str As String
    Threading.Thread.Sleep(1500)
    'Wait some seconds to create "result.txt"

    Dim Ipv4Reader As StreamReader
    Ipv4Reader = File.OpenText("result.txt")

    Do Until Ipv4Found = True

        Ipv4Str = Ipv4Reader.ReadLine()
        If Not Ipv4Str = Nothing Then
            If Ipv4Str.Contains("IPv4") Then
                Try
                    Ipv4 = Ipv4Str.Chars(Ipv4Char)
                    Do Until Ipv4Char = 60
                        Ipv4Char = Ipv4Char + 1
                        Ipv4 = Ipv4 & Ipv4Str.Chars(Ipv4Char)
                        'Read results step by step
                    Loop
                Catch ex As Exception
                End Try
                MsgBox("Your IPv4 Address is " & Ipv4)
                Ipv4Found = True
                Ipv4Reader.Close()

            End If
        Else

        End If
    Loop

如果您的计算机语言是英语，那么IPv4字符串中可能有一些不常见的字符(我的pc实际上是意大利语)