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#Region "Microsoft.VisualBasic::ffe7f62e8c3ac70f7bf03ef730c54013, Microsoft.VisualBasic.Core\Net\PingUtility.vb"
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#End Region
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Imports System.IO
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Imports System.Net
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Imports System.Net.NetworkInformation
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Imports System.Runtime.CompilerServices
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Imports System.Runtime.InteropServices
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Imports System.Text
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Imports Microsoft.VisualBasic.Language
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Namespace Net
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Public Module PingUtility
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<Flags> Public Enum ConnectionState As Integer
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INTERNET_CONNECTION_MODEM = &H1
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INTERNET_CONNECTION_LAN = &H2
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INTERNET_CONNECTION_PROXY = &H4
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INTERNET_RAS_INSTALLED = &H10
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INTERNET_CONNECTION_OFFLINE = &H20
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INTERNET_CONNECTION_CONFIGURED = &H40
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End Enum
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<DllImport("wininet", CharSet:=CharSet.Auto)>
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Public Function InternetGetConnectedState(ByRef lpdwFlags As ConnectionState, dwReserved As Integer) As Boolean
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End Function
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Public Function IsOffline() As Boolean
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Dim state As ConnectionState = 0
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InternetGetConnectedState(state, 0)
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If (CInt(ConnectionState.INTERNET_CONNECTION_OFFLINE) And CInt(state)) <> 0 Then
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Return True
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End If
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Return False
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End Function
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Public Function Ping(ip As IPAddress,
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Optional timeOut As UInteger = 3000,
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Optional out As TextWriter = Nothing,
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Optional nTimes% = 4,
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Optional displayEcho As Boolean = True) As Double
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Dim options As New PingOptions(128, True)
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Dim pingTools As New Ping()
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Dim data As Byte() = New Byte(31) {}
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Dim received As Integer = 0
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Dim responseTimes As New List(Of Long)()
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out = out Or App.StdOut
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For i As Integer = 0 To nTimes - 1
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With pingTools.PingOnce(ip, timeOut, data, options)
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responseTimes += .responseTime
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received += .success
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If displayEcho Then
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Call out.WriteLine(.Msg)
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End If
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End With
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Next
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Dim averageTime As Long = -1
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Dim minimumTime As Long = 0
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Dim maximumTime As Long = 0
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For i As Integer = 0 To responseTimes.Count - 1
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If i = 0 Then
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minimumTime = responseTimes(i)
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maximumTime = responseTimes(i)
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Else
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If responseTimes(i) > maximumTime Then
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maximumTime = responseTimes(i)
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End If
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If responseTimes(i) < minimumTime Then
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minimumTime = responseTimes(i)
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End If
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End If
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averageTime += responseTimes(i)
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Next
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If displayEcho Then
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Call out.Print(minimumTime, maximumTime, received, averageTime, ip)
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End If
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If received <= 0 Then
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Return Double.MaxValue
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Else
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Return averageTime \ received
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End If
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End Function
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<Extension>
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Private Function PingOnce(pingTool As Ping, ip As IPAddress, timeOut As UInt32,
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data As Byte(),
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options As PingOptions) As (success%, responseTime&, Msg$)
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Dim reply As PingReply = Nothing
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Dim received%
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Try
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reply = pingTool.Send(ip, timeOut, data, options)
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Catch ex As Exception
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Return (0, 10 * 1000, "Error!")
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End Try
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If reply Is Nothing Then
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Return (0, 10 * 1000, "Error!")
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End If
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Dim responseTime&
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Dim msg$
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Select Case reply.Status
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Case IPStatus.Success
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If reply.Options Is Nothing Then
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msg = $"Reply from {reply.Address}: bytes={reply.Buffer.Length} time={reply.RoundtripTime}ms"
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Else
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msg = $"Reply from {reply.Address}: bytes={reply.Buffer.Length} time={reply.RoundtripTime}ms TTL={reply.Options.Ttl}"
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End If
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received = 1
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responseTime = reply.RoundtripTime
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Case IPStatus.TimedOut
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msg = "Request timed out."
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Case Else
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msg = $"Ping failed {reply.Status.ToString}"
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End Select
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Return (received, responseTime, msg)
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End Function
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<Extension>
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Private Sub Print(out As TextWriter, minimumTime&, maximumTime&, received%, averageTime&, ip As IPAddress)
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Dim statistics As New StringBuilder()
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statistics.AppendFormat("Ping statistics for {0}:", ip.ToString())
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statistics.AppendLine()
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statistics.AppendFormat(" Packets: Sent = 4, Received = {0}, Lost = {1} <{2}% loss>,", received, 4 - received, Convert.ToInt32(((4 - received) * 100) \ 4))
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statistics.AppendLine()
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statistics.Append("Approximate round trip times in milli-seconds:")
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statistics.AppendLine()
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If averageTime <> -1 Then
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statistics.AppendFormat(" Minimum = {0}ms, Maximum = {1}ms, Average = {2}ms", minimumTime, maximumTime, CLng(averageTime \ received))
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End If
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out.WriteLine()
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out.WriteLine(statistics.ToString())
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out.WriteLine()
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End Sub
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End Module
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End Namespace
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