[RESOLVED] Windows Server 2003 and Sockets

A lot of the following code has been "borrowed" from other posts here on the forum. I have a lot of editing to do and commenting still so bare with the very rough code.

The following code works great on a Windows XP machine. With the server on 2003 or XP doesn't matter. However if the Client app running on Windows Server 2003 it will crash no matter what the server app is located on.

The error is:
"Unable to read beyond the end of the stream."

The application is being run by the Administrator. I have tried to run the application with compatibility mode for XP, but still no go. I have also tried to run the app with Run As -> Turned off, Run This program with restricted access.

I marked the spot where it seems to be crashing, I ran a bunch of tests and thats as far as it ever gets before returning that error. Thanks for any advice =)

Code Code:

Imports System.Runtime.InteropServices
Imports System.Net.Sockets
Imports System.Net
Imports System.Threading
 
Module modNetwork
 
    Private output As NetworkStream
    Private writer As System.IO.BinaryWriter
    Private reader As System.IO.BinaryReader
    Private readThread As System.Threading.Thread
    Private message As String = ""
    Private Connected As Boolean = True
    Private FileList As String
    Private FolderList As String
    Public FinishedNetworkTask As Boolean = False
 
    Public Sub SendFiles(ByVal tmpFileList As String, ByVal tmpFolderList As String)
        FileList = tmpFileList
        FolderList = tmpFolderList
        readThread = New Thread(New ThreadStart(AddressOf RunClient))
        readThread.IsBackground = True
        readThread.Start()
    End Sub
 
    Private Sub RunClient()
        Dim client As TcpClient
 
        Try
 
            client = New TcpClient()
            client.Connect(IPAddress, Port)
 
            output = client.GetStream()
 
            writer = New System.IO.BinaryWriter(output)
            reader = New System.IO.BinaryReader(output)
 
            Do
                Try
                    If FinishedNetworkTask = True Then client.Close()
                    message = reader.ReadString()
                    DisplayMessage(message)
                Catch ex As Exception
                    MsgBox(ex.Message)
                    FinishedNetworkTask = True
                End Try
            Loop While client.Connected = True
 
            writer.Close()
            reader.Close()
            output.Close()
            client.Close()
 
            Connected = False
 
        Catch ex As Exception
            ErrLog(ex.ToString)
            FinishedNetworkTask = True
        End Try
    End Sub
 
    Private Delegate Sub DisplayDelegate(ByVal message As String)
 
    Private Sub DisplayMessage(ByVal message As String)
        Dim final_message = "", type As String
 
        ' if modifying lstData is not thread safe
        If frmMain.InvokeRequired = True Then
            ' use inherited method Invoke to execute DisplayMessage via a Delegate                                       
            frmMain.Invoke(New DisplayDelegate(AddressOf DisplayMessage), New Object() {message})
            ' OK to modify lstData in current thread
        Else
            type = Mid(message, 1, 4)
            message = Mid(message, 5, message.Length - 4)
 
            Select Case type
                Case "CON$"
                    final_message = message
                    frmMain.GroupBox2.Text = "Information - Sending File List"
 
                    Dim strHostName, strIpAddress As String
 
                    Dim transfer As New FileTransferSend(FileList)
                    AddHandler transfer.TransferFinished, AddressOf TransferFinishedHandler
                    AddHandler transfer.TransferFailed, AddressOf TransferFailedHandler
                    AddHandler transfer.TransferProgressChanged, AddressOf TransferProgressChangedHandler
 
                    strHostName = System.Net.Dns.GetHostName()
                    strIpAddress = System.Net.Dns.GetHostEntry(strHostName).AddressList(0).ToString()
 
                    frmMain.pbOver.Maximum = GetFileSize(FileList)
 
                    Send_Message(strIpAddress & "," & transfer.GetPortNumber & "," & FileList & "," & GetFileSize(FileList), "TFI$")
 
                Case "PRO$"
                    frmMain.pbOver.Maximum = message.Substring(InStr(message, ":"), message.Length - InStr(message, ":"))
                    frmMain.pbOver.Value = message.Substring(0, InStr(message, ":") - 1)
 
                Case "FIN$"
                    FinishedNetworkTask = True
            End Select
 
        End If
    End Sub
 
    Private Function Send_Message(ByVal Message As String, Optional ByVal Type As String = "") As Integer
 
        'If Connected = True Then
        writer.Write(Type & Message)
        'Else
        'MsgBox("Not Connected Yet")
        'End If
 
    End Function
 
    Private Sub TransferFinishedHandler(ByVal sender As FileTransferSend, ByVal file As String)
        If InStr(file.ToLower, "file") <> 0 Then
            frmMain.GroupBox2.Text = "Information - Sending Folder List"
 
            Dim strHostName, strIpAddress As String
 
            Dim transfer As New FileTransferSend(FolderList)
            AddHandler transfer.TransferFinished, AddressOf TransferFinishedHandler
            AddHandler transfer.TransferFailed, AddressOf TransferFailedHandler
            AddHandler transfer.TransferProgressChanged, AddressOf TransferProgressChangedHandler
 
            strHostName = System.Net.Dns.GetHostName()
            strIpAddress = System.Net.Dns.GetHostEntry(strHostName).AddressList(0).ToString()
 
            frmMain.pbOver.Maximum = GetFileSize(FolderList)
 
            Send_Message(strIpAddress & "," & transfer.GetPortNumber & "," & FolderList & "," & GetFileSize(FolderList), "TFO$")
        Else
            Send_Message(MessageOnComplete, "FIN$")
        End If
    End Sub
 
    Private Sub TransferFailedHandler(ByVal sender As FileTransferSend, ByVal file As String)
        MsgBox("Oops...Something didnt work right.")
    End Sub
 
    Private Sub TransferProgressChangedHandler(ByVal sender As FileTransferSend, ByVal current As Long, ByVal maximum As Long)
        DisplayMessage("PRO$" & current & ":" & maximum)
    End Sub
 
    Public Function GetFileSize(ByVal MyFilePath As String) As Long
        Dim MyFile As New System.IO.FileInfo(MyFilePath)
        Dim FileSize As Long = MyFile.Length
        Return FileSize
    End Function
End Module
 
 
Public Class FileTransferSend
    Private m_listener As System.Net.Sockets.Socket
    Private m_Thread As System.Threading.Thread
    Private m_file As String
    Private m_port As Integer
    Private Const BUFFER_SIZE As Integer = 8192
    Public Event TransferFinished(ByVal sender As FileTransferSend, ByVal file As String)
    Public Event TransferFailed(ByVal sender As FileTransferSend, ByVal file As String)
    Public Event TransferProgressChanged(ByVal sender As FileTransferSend, ByVal current As Long, ByVal maximum As Long)
 
    Sub New(ByVal file As String)
        m_file = file
        m_listener = New System.Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork, Net.Sockets.SocketType.Stream, Net.Sockets.ProtocolType.Tcp)
        m_listener.Bind(New System.Net.IPEndPoint(System.Net.IPAddress.Any, 0))
        m_listener.Listen(1)
        m_Thread = New System.Threading.Thread(AddressOf doListen)
        m_Thread.IsBackground = True
        m_Thread.Start()
        m_port = DirectCast(m_listener.LocalEndPoint, System.Net.IPEndPoint).Port
    End Sub
 
    Private Sub doListen()
        Dim host As System.Net.Sockets.Socket
        Dim bytesRead As Integer = 0
        Dim totalBytesRead As Long = 0
        Dim sendBuffer(BUFFER_SIZE - 1) As Byte
        Dim failed As Boolean = False
        Dim fileLength As Long
        Dim fStream As System.IO.FileStream = Nothing
 
        '#### Seems to Crash Here
        host = m_listener.Accept()
 
        If System.IO.File.Exists(m_file) Then
            Try
 
                fStream = New System.IO.FileStream(m_file, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.Read)
                fileLength = fStream.Length
                Do
                    bytesRead = fStream.Read(sendBuffer, 0, BUFFER_SIZE)
                    If (bytesRead > 0) Then
                        host.Send(sendBuffer, bytesRead, Net.Sockets.SocketFlags.None)
                        totalBytesRead += bytesRead
                        RaiseEvent TransferProgressChanged(Me, totalBytesRead, fileLength)
                    End If
                Loop While bytesRead > 0
            Catch ex As Exception
                failed = True
            Finally
                If Not fStream Is Nothing Then
                    fStream.Close()
                End If
            End Try
        Else
            failed = True
        End If
        If failed Then
            RaiseEvent TransferFailed(Me, m_file)
        Else
            RaiseEvent TransferFinished(Me, m_file)
        End If
    End Sub
 
    Public ReadOnly Property GetPortNumber() As Integer
        Get
            Return m_port
        End Get
    End Property
End Class

When I want to send the 2 files I just use:

Call Code:

SendFiles(AppPath & "FileList.txt", AppPath & "FolderList.txt")
            Do Until FinishedNetworkTask = True
            Loop

is it an x64 or x86 server?

Good question, x86

Tried it on 2 different servers as well. One I am 100% positive is x86.

do you have Visual Studio installed on the server so that maybe you can test? or perhaps you can look into setting up remote debugging so you can debug the app as it runs on the server. Pinpointed the exact trouble spot will likely make things easier. If you can't do either, then some robust logging to a textfile in your code would at least let you know the steps the app does perform before crashing.

Yea I threw a whole bunch of msgboxes after each step and saw which one was the last to show to figure out where it was dieing. Thats where I came up with that spot. However one of the boxes I can install VS on so I'm going to go ahead and do that now. :)

Yeup thats the exact spot it dies on with the same error. If I remove all the try statements instead of the application breaking at a line of code it just hangs forever. Quite baffled why this works like a charm on XP and not 2003.

Line of Crash -> "host = m_listener.Accept()"

Finally got the application to break on a line of code.

It broke @

message = reader.ReadString()

with that error.

Trying to figure out what was the last thing sent to the application now.

Oh I hate myself sometimes. In the server I forcibly changed the IP address on the file transfer receive like a doofus. Sure enough with the correct IP address it works fine. Sorry to have wasted your time.

didn't waste mine.. only your own ;)

I always consider things like that a lesson in troubleshooting...