我有一个遗留（2008）Windows服务应用程序（使用System.ServiceProcess.ServiceBase），我需要以稍微不同的方式使用它现在的工作方式。它启动并在特定端口上创建TCPLISTENER，以便客户端应用程序连接（它只执行一次），以便向侦听端口发送/接收请求。一切正常。但是，适应需要使用Web应用程序连接到侦听器端口，然后正常发送/ rcv但在接收后它必须DISCONNECT（*）
（* - 如果web应用程序在每次测试之后不必断开与侦听套接字的连接，那么我可能会实现这一点超出我的范围。我是否可以在会话状态中保持TCP连接-use？）
无论如何，适应性对于第一次 TWO 连接/发送/ rcv / disconnect测试都很好，但在 THIRD 上，服务会在EndAccept中抛出ArgumentException。套接字类。
我不明白为什么它在第3次测试时失败了。
这是简单的测试客户端。
Public Class ConnectDisconnectTCP
Inherits System.Web.UI.Page
Private IP As String = "127.0.0.1"
Private port As Int32 = 10002
Private mTCP As System.Net.Sockets.TcpClient
Private netStrm As NetworkStream
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim oEnc As New ASCIIEncoding
Dim ScanText As String = "100000000093001X" + vbLf
Dim mTCP As System.Net.Sockets.TcpClient
'connect and create a tcpclient
mTCP = New System.Net.Sockets.TcpClient(IP, port)
netStrm = mTCP.GetStream()
netStrm.WriteAsync(oEnc.GetBytes(ScanText.ToString), 0, ScanText.ToString.Length)
If netStrm.CanRead Then
Dim myReadBuffer(1024) As Byte
Dim myCompleteMessage As StringBuilder = New StringBuilder()
Dim numberOfBytesRead As Integer = 0
' Incoming message may be larger than the buffer size.
Do
numberOfBytesRead = netStrm.Read(myReadBuffer, 0, myReadBuffer.Length)
myCompleteMessage.AppendFormat("{0}", Encoding.ASCII.GetString(myReadBuffer, 0, numberOfBytesRead))
Loop While netStrm.DataAvailable
End If
'CLOSE
netStrm.Close()
mTCP.Close() 'Disposes this TcpClient instance and requests that the underlying TCP connection be closed.
mTCP = Nothing
Label1.Text = "Closed"
End Sub End Class
这是服务上执行所有工作的TCPListener类
Imports System
Imports System.IO
Imports System.Net
Imports System.Net.Sockets
Imports System.Threading
Imports System.Text
Public Class TCPListenerPort
Private currentAsynchResult As IAsyncResult
Private cState As ClientState
Private servSock As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
Private m_connectionstate As Int32 = 0
Dim sData As String = String.Empty
'counters
Public cnt As Int32 = 0
Public rcvcnt As Int32 = 0
Public acccnt As Int32 = 0
Public sndcnt As Int32 = 0
Public sndcal As Int32 = 0
Public cncnt As Int32 = 0
'Public Events
Public Event ConnectionState(ByVal enmState As Int32)
Public Event DataArrived(ByVal strData As Object)
Public Sub New()
End Sub
Public Sub New(ByVal dr As DataRow)
End Sub
Protected Overrides Sub Finalize()
Try
If Not cState Is Nothing Then
cState.ClntSock.Close()
End If
If Not servSock Is Nothing Then
servSock.Close()
End If
Catch ex As Exception
Throw ex
Finally
MyBase.Finalize()
End Try
End Sub
Private Class ClientState
Public Const BUFSIZE As Integer = 1024
Public mrcvBuffer As Byte() = New Byte(BUFSIZE - 1) {}
Public mSendBuffer As Byte() = New Byte(BUFSIZE - 1) {}
Private mclntSock As Socket = Nothing
Public Sub New(ByRef clntSock As Socket)
mclntSock = clntSock
ReDim mrcvBuffer(BUFSIZE)
ReDim mSendBuffer(BUFSIZE)
End Sub
Public ReadOnly Property SckConnected() As Boolean
Get
SckConnected = mclntSock.Connected
End Get
End Property
Public ReadOnly Property RcvBuffer() As Byte()
Get
RcvBuffer = mrcvBuffer
End Get
End Property
Public ReadOnly Property SendBuffer() As Byte()
Get
SendBuffer = mSendBuffer
End Get
End Property
Public ReadOnly Property ClntSock() As Socket
Get
ClntSock = mclntSock
End Get
End Property
End Class
Public Sub Connect(ByVal TCPPort As Int32, ByVal Backlog As Int32)
Try
cState = New ClientState(servSock)
cState.ClntSock.Bind(New IPEndPoint(System.Net.IPAddress.Any, TCPPort))
cState.ClntSock.Listen(100) '5
While True
cncnt = cncnt + 1
System.Diagnostics.Debug.WriteLine("in connect WHILE " + cncnt.ToString)
currentAsynchResult = servSock.BeginAccept(New AsyncCallback(AddressOf AcceptCallback), cState)
currentAsynchResult.AsyncWaitHandle.WaitOne()
End While
Catch __unusedObjectDisposedException1__ As ObjectDisposedException
Catch e As Exception
End Try
End Sub
Private Sub AcceptCallback(ByVal asyncResult As IAsyncResult)
Try
acccnt = acccnt + 1
System.Diagnostics.Debug.WriteLine("AcceptCallback Start" + acccnt.ToString)
'obtain the Socket on which the connection attempt is being made
Dim servSock As ClientState = asyncResult.AsyncState 'Asyncstate gets a user defined object that qualifies or contains info about an async operation
Dim clntSock As Socket
clntSock = servSock.ClntSock.EndAccept(asyncResult)
System.Diagnostics.Debug.WriteLine(clntSock.RemoteEndPoint)
Dim cs As New ClientState(clntSock)
clntSock.BeginReceive(cs.RcvBuffer, 0, cs.RcvBuffer.Length, SocketFlags.None, New AsyncCallback(AddressOf ReceiveCallback), cs)
Catch ar As ArgumentException
'!!!!!Test 3 errors here with
'The IAsyncResult object was not returned from the corresponding asynchronous method on this class.
Catch ex As Exception
End Try
System.Diagnostics.Debug.WriteLine("AcceptCallback End " + acccnt.ToString)
End Sub
Private Sub ReceiveCallback(ByVal asyncResult As IAsyncResult)
rcvcnt = rcvcnt + 1
System.Diagnostics.Debug.WriteLine("ReceiveCallback In " + rcvcnt.ToString)
Dim cs As ClientState = asyncResult.AsyncState
Dim AE As New System.Text.ASCIIEncoding
Dim recvMsgSize As Int32 = 0
Dim strTmp As String = String.Empty
Dim strSend As String = String.Empty
Try
recvMsgSize = cs.ClntSock.EndReceive(asyncResult)
strTmp = Replace(AE.GetString(cs.RcvBuffer), vbNullChar, "")
If recvMsgSize > 0 Then
System.Diagnostics.Debug.WriteLine("ReceiveCallback receiveMsgSize " + recvMsgSize.ToString)
If Right(strTmp, 1) = vbLf Or Right(strTmp, 1) = vbCr Then
strSend = sData + strTmp
strSend = strSend.Replace(vbLf, "")
strSend = strSend.Replace(vbCr, "")
cState = cs
sData = String.Empty
RaiseEvent DataArrived(strSend)
Else
End If
Else
End If
Catch ex As Exception
Throw ex
End Try
System.Diagnostics.Debug.WriteLine("ReceiveCallback Exit " + rcvcnt.ToString)
End Sub
Public Function SendData(ByVal strData As Object) As Boolean
' Change the data to a byte array if necessary, then send it via the socket
Dim oEncoder As New System.Text.ASCIIEncoding
Dim bytes As Byte()
Dim Result As IAsyncResult
Try
Select Case strData.GetType().ToString
Case "System.String" ' Convert a string to a byte array
bytes = oEncoder.GetBytes(strData)
Case "System.Byte[]" ' Send a byte array directly
bytes = strData
Case Else ' And just send anything else as-is
bytes = strData
End Select
sndcnt = sndcnt + 1
Result = cState.ClntSock.BeginSend(bytes, 0, bytes.Length, SocketFlags.None, New AsyncCallback(AddressOf SendCallback), cState)
System.Diagnostics.Debug.WriteLine("SendData " + sndcnt + " " + Result.ToString)
Result.AsyncWaitHandle.WaitOne()
Catch ex As Exception
Throw ex
End Try
Return True
End Function
Private Sub SendCallback(ByVal asyncResult As IAsyncResult)
Dim cs As ClientState = asyncResult.AsyncState
Dim bytesSent As Int32 = 0
Try
bytesSent = cs.ClntSock.EndSend(asyncResult)
sndcal = sndcal + 1
cs.ClntSock.BeginReceive(cs.RcvBuffer, 0, cs.RcvBuffer.Length, SocketFlags.None, New AsyncCallback(AddressOf ReceiveCallback), cs)
System.Diagnostics.Debug.WriteLine("SendCallBack " + sndcal.ToString + " " + bytesSent.ToString)
Catch ex As Exception
Throw (ex)
End Try
End Sub
End Class
启用.net跟踪，加上代码的系统诊断debug.write，这里是TEST1，TEST2，TEST3 / CRASH操作的完整日志。请注意'＆lt; - SCANTEXT RECEIVED'和'＆lt; - RESPONSE RECEIVED'注释。 'in connect WHILE 4'注释显示第三次请求尝试的到来。
[12572] TcpClient#57416410::TcpClient(AddressFamily#2)
[12572] Socket#61940669::Socket(AddressFamily#2)
[12572] Exiting Socket#61940669::Socket()
[12572] Exiting TcpClient#57416410::TcpClient()
[12572] TcpClient#57416410::TcpClient()
[12572] Exiting TcpClient#57416410::TcpClient()
[12572] Socket#15193904::Socket(AddressFamily#2)
[12572] Exiting Socket#15193904::Socket()
[17872] Socket#40528290::Socket(AddressFamily#2)
[17872] Exiting Socket#40528290::Socket()
[17872] Socket#40528290::Bind(0.0.0.0:10002#10002)
[17872] Exiting Socket#40528290::Bind()
[17872] Socket#40528290::Listen(Int32#100)
[17872] Exiting Socket#40528290::Listen()
in connect WHILE 1
[17872] Socket#40528290::BeginAccept()
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#515737
The thread '1' (0x6674) has exited with code 0 (0x0).
The thread '<No Name>' (0x1df8) has exited with code 0 (0x0).
The thread '<No Name>' (0x5dac) has exited with code 0 (0x0).
[7984] Socket#49538252::Socket()
[7984] Exiting Socket#49538252::Socket()
in connect WHILE 2
AcceptCallback Start1
[17872] Socket#40528290::BeginAccept()
[7984] Socket#40528290::EndAccept(AcceptAsyncResult#515737)
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#27334100
System.Net.Sockets Information: 0 : [7984] Socket#49538252 - Accepted connection from 127.0.0.1:63817 to 127.0.0.1:10002.
[7984] Exiting Socket#40528290::EndAccept() -> Socket#49538252
127.0.0.1:63817
[7984] Socket#49538252::BeginReceive()
[7984] Exiting Socket#49538252::BeginReceive() -> OverlappedAsyncResult#62696216
AcceptCallback End 1
[22168] Data from Socket#49538252::PostCompletion
[22168] 00000000 : 32 30 30 30 30 30 30 30-30 30 38 33 30 30 31 58 : 100000000093001X <-- SCANTEXT RECEIVED, TEST1
[22168] 00000010 : 0A : .
ReceiveCallback In 1
[22168] Socket#49538252::EndReceive(OverlappedAsyncResult#62696216)
[22168] Exiting Socket#49538252::EndReceive() -> Int32#17
ReceiveCallback receiveMsgSize 17
[22168] Socket#49538252::BeginSend()
[22168] Exiting Socket#49538252::BeginSend() -> OverlappedAsyncResult#13462887
A first chance exception of type 'System.FormatException' occurred in Microsoft.VisualBasic.dll
[19228] Data from Socket#49538252::PostCompletion
[19228] 00000000 : 07 : . <-- RESPONSE RECEIVED, TEST1
[19228] Socket#49538252::EndSend(OverlappedAsyncResult#13462887)
[19228] Exiting Socket#49538252::EndSend() -> Int32#1
[19228] Socket#49538252::BeginReceive()
[19228] Exiting Socket#49538252::BeginReceive() -> OverlappedAsyncResult#25961440
SendCallBack 1 1
[7984] Data from Socket#49538252::PostCompletion
[7984] 00000000 : :
ReceiveCallback In 2
[7984] Socket#49538252::EndReceive(OverlappedAsyncResult#25961440)
[7984] Exiting Socket#49538252::EndReceive() -> Int32#0
ReceiveCallback Exit 2
ReceiveCallback Exit 2
[22168] Socket#31352595::Socket()
[22168] Exiting Socket#31352595::Socket()
AcceptCallback Start2
in connect WHILE 3
[17872] Socket#40528290::BeginAccept()
[22168] Socket#40528290::EndAccept(AcceptAsyncResult#27334100)
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#39421196
System.Net.Sockets Information: 0 : [22168] Socket#31352595 - Accepted connection from 127.0.0.1:63820 to 127.0.0.1:10002.
[22168] Exiting Socket#40528290::EndAccept() -> Socket#31352595
127.0.0.1:63820
[22168] Socket#31352595::BeginReceive()
[22168] Exiting Socket#31352595::BeginReceive() -> OverlappedAsyncResult#28002689
AcceptCallback End 2
[7984] Data from Socket#31352595::PostCompletion
[7984] 00000000 : 32 30 30 30 30 30 30 30-30 30 38 33 30 30 31 58 : 100000000093001X <-- SCANTEXT RECEIVED, TEST2
[7984] 00000010 : 0A : .
ReceiveCallback In 3
[7984] Socket#31352595::EndReceive(OverlappedAsyncResult#28002689)
[7984] Exiting Socket#31352595::EndReceive() -> Int32#17
ReceiveCallback receiveMsgSize 17
[7984] Socket#31352595::BeginSend()
[7984] Exiting Socket#31352595::BeginSend() -> OverlappedAsyncResult#31071611
[22168] Data from Socket#31352595::PostCompletion
A first chance exception of type 'System.FormatException' occurred in Microsoft.VisualBasic.dll
[22168] 00000000 : 07 : . <-- RESULT RECEIVED, TEST2
[22168] Socket#31352595::EndSend(OverlappedAsyncResult#31071611)
[22168] Exiting Socket#31352595::EndSend() -> Int32#1
[22168] Socket#31352595::BeginReceive()
[22168] Exiting Socket#31352595::BeginReceive() -> OverlappedAsyncResult#51673536
SendCallBack 2 1
[4640] Data from Socket#31352595::PostCompletion
[4640] 00000000 : :
ReceiveCallback Exit 3
The thread '<No Name>' (0x4b1c) has exited with code 0 (0x0).
ReceiveCallback In 4
[4640] Socket#31352595::EndReceive(OverlappedAsyncResult#51673536)
[4640] Exiting Socket#31352595::EndReceive() -> Int32#0
ReceiveCallback Exit 4
[4640] Socket#37088038::Socket()
[4640] Exiting Socket#37088038::Socket()
AcceptCallback Start3
[4640] Socket#49538252::EndAccept(AcceptAsyncResult#39421196)
in connect WHILE 4
[17872] Socket#40528290::BeginAccept()
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#8948635
//ERROR THROWN HERE
AcceptCallback End 3
[12572] TcpClient#57416410::TcpClient(AddressFamily#2)
[12572] Socket#61940669::Socket(AddressFamily#2)
[12572] Exiting Socket#61940669::Socket()
[12572] Exiting TcpClient#57416410::TcpClient()
[12572] TcpClient#57416410::TcpClient()
[12572] Exiting TcpClient#57416410::TcpClient()
[12572] Socket#15193904::Socket(AddressFamily#2)
[12572] Exiting Socket#15193904::Socket()
[17872] Socket#40528290::Socket(AddressFamily#2)
[17872] Exiting Socket#40528290::Socket()
[17872] Socket#40528290::Bind(0.0.0.0:10002#10002)
[17872] Exiting Socket#40528290::Bind()
[17872] Socket#40528290::Listen(Int32#100)
[17872] Exiting Socket#40528290::Listen()
in connect WHILE 1
[17872] Socket#40528290::BeginAccept()
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#515737
The thread '1' (0x6674) has exited with code 0 (0x0).
The thread '<No Name>' (0x1df8) has exited with code 0 (0x0).
The thread '<No Name>' (0x5dac) has exited with code 0 (0x0).
[7984] Socket#49538252::Socket()
[7984] Exiting Socket#49538252::Socket()
in connect WHILE 2
AcceptCallback Start1
[17872] Socket#40528290::BeginAccept()
[7984] Socket#40528290::EndAccept(AcceptAsyncResult#515737)
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#27334100
System.Net.Sockets Information: 0 : [7984] Socket#49538252 - Accepted connection from 127.0.0.1:63817 to 127.0.0.1:10002.
[7984] Exiting Socket#40528290::EndAccept() -> Socket#49538252
127.0.0.1:63817
[7984] Socket#49538252::BeginReceive()
[7984] Exiting Socket#49538252::BeginReceive() -> OverlappedAsyncResult#62696216
AcceptCallback End 1
[22168] Data from Socket#49538252::PostCompletion
[22168] 00000000 : 32 30 30 30 30 30 30 30-30 30 38 33 30 30 31 58 : 100000000093001X <-- SCANTEXT RECEIVED, TEST1
[22168] 00000010 : 0A : .
ReceiveCallback In 1
[22168] Socket#49538252::EndReceive(OverlappedAsyncResult#62696216)
[22168] Exiting Socket#49538252::EndReceive() -> Int32#17
ReceiveCallback receiveMsgSize 17
[22168] Socket#49538252::BeginSend()
[22168] Exiting Socket#49538252::BeginSend() -> OverlappedAsyncResult#13462887
A first chance exception of type 'System.FormatException' occurred in Microsoft.VisualBasic.dll
[19228] Data from Socket#49538252::PostCompletion
[19228] 00000000 : 07 : . <-- RESPONSE RECEIVED, TEST1
[19228] Socket#49538252::EndSend(OverlappedAsyncResult#13462887)
[19228] Exiting Socket#49538252::EndSend() -> Int32#1
[19228] Socket#49538252::BeginReceive()
[19228] Exiting Socket#49538252::BeginReceive() -> OverlappedAsyncResult#25961440
SendCallBack 1 1
[7984] Data from Socket#49538252::PostCompletion
[7984] 00000000 : :
ReceiveCallback In 2
[7984] Socket#49538252::EndReceive(OverlappedAsyncResult#25961440)
[7984] Exiting Socket#49538252::EndReceive() -> Int32#0
ReceiveCallback Exit 2
ReceiveCallback Exit 2
[22168] Socket#31352595::Socket()
[22168] Exiting Socket#31352595::Socket()
AcceptCallback Start2
in connect WHILE 3
[17872] Socket#40528290::BeginAccept()
[22168] Socket#40528290::EndAccept(AcceptAsyncResult#27334100)
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#39421196
System.Net.Sockets Information: 0 : [22168] Socket#31352595 - Accepted connection from 127.0.0.1:63820 to 127.0.0.1:10002.
[22168] Exiting Socket#40528290::EndAccept() -> Socket#31352595
127.0.0.1:63820
[22168] Socket#31352595::BeginReceive()
[22168] Exiting Socket#31352595::BeginReceive() -> OverlappedAsyncResult#28002689
AcceptCallback End 2
[7984] Data from Socket#31352595::PostCompletion
[7984] 00000000 : 32 30 30 30 30 30 30 30-30 30 38 33 30 30 31 58 : 100000000093001X <-- SCANTEXT RECEIVED, TEST2
[7984] 00000010 : 0A : .
ReceiveCallback In 3
[7984] Socket#31352595::EndReceive(OverlappedAsyncResult#28002689)
[7984] Exiting Socket#31352595::EndReceive() -> Int32#17
ReceiveCallback receiveMsgSize 17
[7984] Socket#31352595::BeginSend()
[7984] Exiting Socket#31352595::BeginSend() -> OverlappedAsyncResult#31071611
[22168] Data from Socket#31352595::PostCompletion
A first chance exception of type 'System.FormatException' occurred in Microsoft.VisualBasic.dll
[22168] 00000000 : 07 : . <-- RESULT RECEIVED, TEST2
[22168] Socket#31352595::EndSend(OverlappedAsyncResult#31071611)
[22168] Exiting Socket#31352595::EndSend() -> Int32#1
[22168] Socket#31352595::BeginReceive()
[22168] Exiting Socket#31352595::BeginReceive() -> OverlappedAsyncResult#51673536
SendCallBack 2 1
[4640] Data from Socket#31352595::PostCompletion
[4640] 00000000 : :
ReceiveCallback Exit 3
The thread '<No Name>' (0x4b1c) has exited with code 0 (0x0).
ReceiveCallback In 4
[4640] Socket#31352595::EndReceive(OverlappedAsyncResult#51673536)
[4640] Exiting Socket#31352595::EndReceive() -> Int32#0
ReceiveCallback Exit 4
[4640] Socket#37088038::Socket()
[4640] Exiting Socket#37088038::Socket()
AcceptCallback Start3
[4640] Socket#49538252::EndAccept(AcceptAsyncResult#39421196)
in connect WHILE 4
[17872] Socket#40528290::BeginAccept()
[17872] Exiting Socket#40528290::BeginAccept() -> AcceptAsyncResult#8948635
//ERROR THROWN HERE
AcceptCallback End 3
使用netstat进行监控
当服务启动时，会出现此信息，表示服务正在侦听端口10002
在第一次和第二次扫描（即成功）一切正常。测试网络应用程序连接，发送'scantext'，各种回调代表被解雇，我们得到一个很好的答复。
在连接完成后的第一次测试期间Netstat：
TCP 0.0.0.0:10002 LON-WKS-ZER01:0 LISTENING
（然后扫描＃1完成）
当调用testApp mTCP.Close（）时，状态变为CLOSE_WAIT和FIN_WAIT_2
TCP 0.0.0.0:10002 LON-WKS-ZER01:0 LISTENING
TCP 127.0.0.1:10002 apps:59574 ESTABLISHED
TCP 127.0.0.1:59574 apps:10002 ESTABLISHED
几分钟后，CLOSE和FIN连接消失，但仍然有LISTENER
TCP 0.0.0.0:10002 LON-WKS-ZER01:0 LISTENING
TCP 127.0.0.1:10002 apps:59574 CLOSE_WAIT
TCP 127.0.0.1:59574 apps:10002 FIN_WAIT_2
接下来，发送扫描＃2，它重复上述序列，结果成功。
在第三次扫描时，当它尝试建立新连接时，在此行的AcceptCallback中抛出异常：
TCP 0.0.0.0:10002 LON-WKS-ZER01:0 LISTENING
具体来说，它是一个ArgumentException，'asyncResult不是通过调用BeginAccept'创建的（参见EndAccept）
因此，由于我无法理解的原因，第3次测试的IASyncResult导致EndAccept方法抛出ArgumentException。
总结错误 - Connect调用的BeginAccept为AcceptCallback设置委托并传递IASyncResult。 AcceptCallBacks EndAccept抛出ArgumentException
我意识到事情的实现方式并不是最新的，而且我们会用其他东西做得更好，但是有了一件事和另一件事（时间，资源），我需要尝试让轻微的适应工作。但我不明白为什么（现有的客户端应用程序）连接，扫描，扫描，扫描，扫描等工作，但（网络应用程序）连接，扫描，断开连接，扫描，断开连接失败的第三次扫描的CONNECT
提前感谢任何建议。
答案 0 :(得分：1)
提出了类似的问题并回答了here
...您将套接字对象保存在类范围的变量中。因此，如果 不知何故，套接字在ReadCallback时断开连接 执行并重新连接（从而更改套接字对象） - 现在他们不匹配，您正在尝试完成异步请求 当旧对象实际完成时，使用新对象。
在您的情况下，它是变量cState。在Connect方法上，如果您只是在本地声明一个新的cState实例来保存套接字，那么错误可能会停止发生。
Dim clientState As New ClientState(servSock)
clientState.ClntSock.Bind(New IPEndPoint(System.Net.IPAddress.Any, TCPPort))
clientState.ClntSock.Listen(Backlog)
While True
Dim result As IAsyncResult = servSock.BeginAccept(New AsyncCallback(AddressOf AcceptCallback), clientState)
result.AsyncWaitHandle.WaitOne()
End While
此外，mTCP应该在客户端处理。