I am attempting to write a vb.net 2008 application that will allow me to send files from a server to a client based on a request. I am going to post the same console application code below. When i run the server and the client on the local machine, i can get my file update and it works just fine. When i go to a different machine on my network and attempt to connect to the server and download the file, i get the correct file size but the file, when i attempt to run it, says "not a valid win32 application". Now with a little testing, this can be any executable that i send over the network through my update software.
Hopefully i have explained enough for you guys to help me. Take a look at this and let me know.
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SERVER
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Imports System.Net.Sockets
Imports System.IO
Module Module1
Sub Main()
Dim serverSocket As New TcpListener(System.Net.IPAddress.Any, "9749")
Dim clientSocket As TcpClient
Dim counter As Integer
Try
serverSocket.Start()
counter = 0
Console.Clear()
Console.WriteLine("Monitoring Server Update Module is now online.", "I")
While (True)
counter += 1
clientSocket = serverSocket.AcceptTcpClient()
Console.WriteLine("Client Connected.")
Dim intRequestCount As Integer = 0
Dim bytesFrom(8193) As Byte
Dim strRecvData As String = ""
Dim strClientData As String = ""
Dim strRequest As String = "" ' will be UPD_UPDATER / UPD_CLIENT so we know what to send
Try
Dim UpdateStream As NetworkStream = clientSocket.GetStream()
intRequestCount += 1
' this gets whats out there
'UpdateStream.Read(bytesFrom, 0, CInt(clientSocket.ReceiveBufferSize))
'strRecvData = Trim(System.Text.Encoding.ASCII.GetString(bytesFrom))
'strRecvData = BitConverter.ToString(bytesFrom)
' String to store the response ASCII representation.
Dim responseData As [String] = [String].Empty
Dim data As [Byte]()
data = New [Byte](256) {}
' Read the first batch of the TcpServer response bytes.
Dim bytes As Int32 = UpdateStream.Read(Data, 0, Data.Length)
responseData = System.Text.Encoding.ASCII.GetString(Data, 0, bytes)
Console.WriteLine("Received: " & responseData)
strClientData = strClientData & responseData
Console.WriteLine("Data Received: " & strClientData)
strClientData = Trim(strClientData)
If strClientData = "UPD_UPDATER" Then
' here we need to send the update program
Console.WriteLine("Client asked for updater program.")
Dim fileBuffer As Byte()
Dim fileStream As Stream
fileStream = File.OpenRead("C:\temp\filetosend.exe")
Dim sendBytes As [Byte]() = System.Text.Encoding.ASCII.GetBytes(fileStream.Length.ToString)
UpdateStream.Write(sendBytes, 0, sendBytes.Length)
ReDim fileBuffer(fileStream.Length)
fileStream.Read(fileBuffer, 0, fileStream.Length)
UpdateStream.Write(fileBuffer, 0, fileStream.Length)
UpdateStream.Flush()
End If
If strClientData = "UPD_CLIENT" Then
' here we need to send the client program
Console.WriteLine("Client asked for client program.")
End If
If strClientData <> "UPD_CLIENT" Or "UPD_UPDATER" Then
' somethings not right.
Console.WriteLine("Client asked for something invalid.")
End If
UpdateStream.Close()
clientSocket.Close()
Catch ex As Exception
End Try
End While
serverSocket.Stop()
Catch ex As Exception
End Try
End Sub
End Module------
Client
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Imports System.Net.Sockets
Imports System.Text
Imports System.IO
Module Module1
Sub Main()
Dim tcpClient As New TcpClient
Try
tcpClient.Connect("192.168.1.100", 9749)
Dim networkstream As NetworkStream = tcpClient.GetStream()
If NetworkStream.CanWrite And NetworkStream.CanRead Then
Dim bytes(tcpClient.ReceiveBufferSize) As Byte
Dim strBytesToRecv As String
Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes("UPD_UPDATER")
networkstream.Write(sendBytes, 0, sendBytes.Length)
'Dim responsebytes(tcpClient.ReceiveBufferSize) As Byte
'networkstream.Read(responsebytes, 0, CInt(tcpClient.ReceiveBufferSize))
'Dim responsedata As String = Encoding.ASCII.GetString(responsebytes)
Dim blockSize As Int16 = 1024
Dim thisRead As Int16
Dim dataByte(blockSize) As Byte
Dim fileStream As Stream
Dim data As [Byte]()
Dim intBytesLeft As Long
data = New [Byte](1023) {}
Dim filebytes As Int32
networkstream.Read(data, 0, blockSize)
strBytesToRecv = System.Text.Encoding.ASCII.GetString(data)
intBytesLeft = Int(strBytesToRecv)
Console.WriteLine("Size of file receiving: " & strBytesToRecv)
fileStream = File.OpenWrite("filetosend.exe")
Do
Console.WriteLine("Bytes Left: " & Str(intBytesLeft))
If intBytesLeft >= 1024 Then
filebytes = networkstream.Read(data, 0, data.Length) 'data.length
fileStream.Write(data, 0, data.Length)
intBytesLeft = intBytesLeft - data.Length
Else
filebytes = networkstream.Read(data, 0, intBytesLeft)
fileStream.Write(data, 0, intBytesLeft)
intBytesLeft = intBytesLeft - intBytesLeft
End If
Loop Until intBytesLeft = 0
fileStream.Close()
End If
networkstream.Close()
Catch ex As Exception
End Try
End Sub
End Module