Vb.net UDP SocketException-每个套接字地址通常只允许使用一次
虽然这里有许多问题非常相似,但所提供的答案都没有帮助我,这让我很难过:( 我有一个非常大的管理系统,我的任务是编写一些UDP数据包发送/接收。我已经编写了一个原型,一切都很好,所以我开始将我的代码合并到上述系统中。但是,我现在突然出现了一个(不是停止显示,而是恼人的)SocketException:Vb.net UDP SocketException-每个套接字地址通常只允许使用一次,vb.net,sockets,udp,Vb.net,Sockets,Udp,虽然这里有许多问题非常相似,但所提供的答案都没有帮助我,这让我很难过:( 我有一个非常大的管理系统,我的任务是编写一些UDP数据包发送/接收。我已经编写了一个原型,一切都很好,所以我开始将我的代码合并到上述系统中。但是,我现在突然出现了一个(不是停止显示,而是恼人的)SocketException: System.Net.Sockets.SocketException occurred ErrorCode=10048 Message=Only one usage of each sock
System.Net.Sockets.SocketException occurred
ErrorCode=10048
Message=Only one usage of each socket address (protocol/network address/port) is normally permitted
NativeErrorCode=10048
Source=System
StackTrace:
at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.Bind(EndPoint localEP)
at System.Net.Sockets.UdpClient..ctor(Int32 port, AddressFamily family)
at System.Net.Sockets.UdpClient..ctor(Int32 port)
at Goose.Job.DeviceServerUDPReceiver.InitialiseReceiverClient() in C:\WORK\Trunk\GooseOrders\Classes\SheetCounter\DeviceServerUDPReceiver.vb:line 39
这里是udpreciver类——它负责坐在一个循环中,等待来自设备服务器的响应,我们已经在这个地方找到了
Public Class DeviceServerUDPReceiver : Implements IDisposable
'///////////////////////////////////////////////////////////////////////////////
' CONSTANTS
'///////////////////////////////////////////////////////////////////////////////
Private Const TIBBO_DEVICE_REPLY_CMD_START As Integer = 0
Private Const TIBBO_DEVICE_REPLY_CMD_END As Integer = 3
Private Const TIBBO_MESSAGE_REPLY_DIVIDER As String = "_"
Private Const TIBBO_DEVICE_REPLY_OK As String = "OK"
'///////////////////////////////////////////////////////////////////////////////
' MEMBER VARIABLES
'///////////////////////////////////////////////////////////////////////////////
Public _ReceivingClient As System.Net.Sockets.UdpClient
Public _iReceivingPort As Integer = 2002
Public _thReceivingThread As System.Threading.Thread
Public _bClosing As Boolean
'///////////////////////////////////////////////////////////////////////////////
' EVENTS
'///////////////////////////////////////////////////////////////////////////////
Public Event GotDeviceResponse(ByVal sResponse As String)
Public Event FoundNewDevice(ByVal TibboObject As TibboDevice)
'///////////////////////////////////////////////////////////////////////////////
' METHODS
'///////////////////////////////////////////////////////////////////////////////
' Initialises the UDP receiver client on the specified port number. Then runs
' a listening thread constantly waiting to receive udp messages
Public Sub InitialiseReceiverClient()
Try
' TODO - FIX SOCKET EXCEPTION HERE - NOT THREAD ISSUE - THIS IS DUE TO
' THE SOCKET NOT BEING CLOSED. BUT SEEING HOW UDP IS CONNECTIONLESS .... ?!
_ReceivingClient = New System.Net.Sockets.UdpClient(_iReceivingPort)
Dim thStartThread As Threading.ThreadStart = New Threading.ThreadStart(AddressOf SitAndReceive)
_thReceivingThread = New Threading.Thread(thStartThread)
_thReceivingThread.IsBackground = True
_thReceivingThread.Start()
Catch ex As System.Net.Sockets.SocketException
Console.WriteLine("Socket Exception: " & ex.Message)
Finally
End Try
End Sub
' The endless loop listener thread. Will sit and wait for udp packets to
' process
Private Sub SitAndReceive()
Dim epEndPoint As System.Net.IPEndPoint = New System.Net.IPEndPoint(System.Net.IPAddress.Any, _iReceivingPort)
' infinite loop to listen for udp messages
While (_bClosing = False)
Try
Dim sMessage As String = ""
Dim byData() As Byte
byData = _ReceivingClient.Receive(epEndPoint)
sMessage = System.Text.Encoding.ASCII.GetString(byData)
Console.WriteLine(sMessage)
ProcessIncomingUDPDataMessage(sMessage)
Catch ex As System.Net.Sockets.SocketException
Console.WriteLine(ex.Message)
End Try
End While
End Sub
' close the connection to the receiving udp socket
Public Sub Close()
_bClosing = True
End Sub
' Processes incoming udp packets for answeres from the device servers
Private Sub ProcessIncomingUDPDataMessage(ByVal sMessage As String)
' UDP Data packet from Tibbo devices is set out as follows
'
' CMD_ANSWER
' Where "CMD" = The command the device is replying too and
' "ANSWER" = It's reply
Select Case sMessage.Substring(TIBBO_DEVICE_REPLY_CMD_START, TIBBO_DEVICE_REPLY_CMD_END)
Case TibboDevice.DEVICE_COMMAND_ATO
'/////////////////////////////////////////////////////////////////////////
' Any Tibbo's out there reply message
'/////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sMacAddress As String = s(2) ' the replying devices' mac address
Dim sIpAddress As System.Net.IPAddress = System.Net.IPAddress.Parse(s(3)) ' ip
Dim sNetBiosName As String = s(1) ' netbios name
Dim iTibboStatus As TibboDevice.ETIIBO_DEVICE_STATE = TibboDevice.ETIIBO_DEVICE_STATE.TIBBO_DEVICE_STATE_BAD ' status
' set this device status depending on the reply
If s(4) = TIBBO_DEVICE_REPLY_OK Then
iTibboStatus = TibboDevice.ETIIBO_DEVICE_STATE.TIBBO_DEVICE_STATE_OK
End If
' create a new tibbo device to pass back to the main form
Dim Tibbo As TibboDevice = New TibboDevice(sMacAddress, sIpAddress, sNetBiosName, iTibboStatus)
' raise event to add this to our list
RaiseEvent FoundNewDevice(Tibbo)
Case TibboDevice.DEVICE_COMMAND_STS
'//////////////////////////////////////////////////////////////////////////
' Status reply message
'//////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sResult As String = ""
' format our string nicely
sResult &= "Mac Address: " & vbTab & vbTab & s(1)
sResult &= Environment.NewLine & "IP Address: " & vbTab & vbTab & s(2)
sResult &= Environment.NewLine & "Device Name: " & vbTab & vbTab & s(3)
sResult &= Environment.NewLine & "TiOS FW: " & vbTab & vbTab & s(4)
sResult &= Environment.NewLine & "Goose SC FW: " & vbTab & vbTab & s(5)
sResult &= Environment.NewLine & "System Uptime: " & vbTab & vbTab & s(6)
sResult &= Environment.NewLine & "System Time: " & vbTab & vbTab & s(7)
sResult &= Environment.NewLine & "System Status: " & vbTab & vbTab & s(8)
RaiseEvent GotDeviceResponse(sResult)
Case TibboDevice.DEVICE_COMMAND_ASC
'////////////////////////////////////////////////////////////////////////////
' Average sheet count message
'////////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sResult As String = ""
RaiseEvent GotDeviceResponse(sResult)
Case TibboDevice.DEVICE_COMMAND_NAM
'////////////////////////////////////////////////////////////////////////////
' Changed device name reply message
' Device will reply NAM_[NEWNAME] - once it's set it's new name
'////////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sResult As String = ""
RaiseEvent GotDeviceResponse(sResult)
Case TibboDevice.DEVICE_COMMAND_IDX
'////////////////////////////////////////////////////////////////////////////
' Device responds with it's device id
'////////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sResult As String = ""
' TODO - do something with the result
Case TibboDevice.DEVICE_COMMAND_RBT
'////////////////////////////////////////////////////////////////////////////
' Device is going down for a reboot - not much to do here, we have to wait
'////////////////////////////////////////////////////////////////////////////
Case TibboDevice.DEVICE_COMMAND_BUZ
'////////////////////////////////////////////////////////////////////////////
' Device has played it's buzz sound - ignore
'////////////////////////////////////////////////////////////////////////////
Case TibboDevice.DEVICE_COMMAND_FSH
'////////////////////////////////////////////////////////////////////////////
' Device flashed it's LEDs - ignore
'////////////////////////////////////////////////////////////////////////////
Case TibboDevice.DEVICE_COMMAND_AIP
'////////////////////////////////////////////////////////////////////////////
' Device replies with it's actual ip address
'////////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sResult As String = ""
' TODO - do something with the result
Case TibboDevice.DEVICE_COMMAND_CBC
'////////////////////////////////////////////////////////////////////////////
' Device replies with it's current box count
'////////////////////////////////////////////////////////////////////////////
Dim s() As String = sMessage.Split(TIBBO_MESSAGE_REPLY_DIVIDER)
Dim sResult As String = ""
' TODO - do something with the result
Case TibboDevice.DEVICE_COMMAND_STP
'////////////////////////////////////////////////////////////////////////////
' Device has been stopped - won't reply. Only way to bring it back to life
' is to press the 'reset' button on the actual unit - ignore
'////////////////////////////////////////////////////////////////////////////
End Select
End Sub
Protected Overridable Overloads Sub Dispose(disposing As Boolean)
If (disposing) Then
' free managed objects
'_ReceivingClient = Nothing
_bClosing = True
End If
End Sub
Public Overloads Sub Dispose() Implements IDisposable.Dispose
Dispose(True)
GC.SuppressFinalize(Me)
End Sub
End Class
现在,我在主窗体中所做的是:当我的侦听器窗体关闭时-我想关闭侦听器(显然)…为此,我使用Dispose()
。但是,当有人想再次启动它时,所说的异常发生在byData=\u ReceivingClient.Receive(epEndPoint)上位置和接收过程中的
行
由于UDP是基于事务的,其套接字(理论上可能)不能处于关闭等待状态,是什么阻止我关闭它,然后立即重新启动侦听器
我必须承认,我是UDP套接字的新手,但是到目前为止,我发现使用它们是一件很愉快的事情,即使这个异常不会使最终用户的软件崩溃(只需一次简单的尝试/捕获),它确实让我感兴趣,我想理解为什么会发生这种情况
非常感谢您的帮助。最终解决了这个问题。显然,如果您想与一个套接字建立多个连接,您必须手动配置它,如下所示:
Dim endPoint = New System.Net.IPEndPoint(0, _iReceivingPort)
_ReceivingClient = New System.Net.Sockets.UdpClient()
_ReceivingClient.ExclusiveAddressUse = False
_ReceivingClient.Client.SetSocketOption(Net.Sockets.SocketOptionLevel.Socket, Net.Sockets.SocketOptionName.ReuseAddress, True)
_ReceivingClient.Client.Bind(endPoint)
现在可以工作了,所以我很高兴。很好!我也遇到了同样的问题。我花了一段时间才弄清楚为什么它不工作,我意识到我正在用一个端口实例化我的UdpClient对象(比如\u receiver=new UdpClient(myPort)
),它必须执行一些底层绑定。在我使用默认构造函数之后,它工作得很好。您的解决方案工作得很好!我发送了一个多播请求,在同一台主机上有多个接收器。当我尝试运行多个必须侦听同一端口的接收器时,遇到了相同的错误。