TCP/IP

  • Thread starter Thread starter id10t error
  • Start date Start date
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id10t error

Hello,

I am trying to write soem code that will send data to an Oneil
printer
over our network. I know the printer works and is setup correctly
because I can print to it from there software. In my program i am
getting this error.


System.IO.IOException was unhandled
Message="Unable to read data from the transport connection: An
existing connection was forcibly closed by the remote host."


I will post my code below. Any help would be great.


Imports System.Net.Sockets
Imports System.Text
Public Class Form2


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Dim tcpClient As New System.Net.Sockets.TcpClient()
'tcpClient.Connect(hostname, port)
tcpClient.Connect("10.0.9.106", 515)
Dim networkStream As NetworkStream = tcpClient.GetStream()
If networkStream.CanWrite And networkStream.CanRead Then
' Do a simple write.
Dim sendBytes As [Byte]() =
Encoding.ASCII.GetBytes(" EZ{PRINT,STOP350:@20,35:ZP08A|003|")
networkStream.Write(sendBytes, 0, sendBytes.Length)
' Read the NetworkStream into a byte buffer.
Dim bytes(tcpClient.ReceiveBufferSize) As Byte
networkStream.Read(bytes, 0,
CInt(tcpClient.ReceiveBufferSize))' ---> this is the line giving me
the error
' Output the data received from the host to the console.
Dim returndata As String =
Encoding.ASCII.GetString(bytes)
Console.WriteLine(("Host returned: " + returndata))
Else
If Not networkStream.CanRead Then
Console.WriteLine("cannot not write data to this
stream")
tcpClient.Close()
Else
If Not networkStream.CanWrite Then
Console.WriteLine("cannot read data from this
stream")
tcpClient.Close()
End If
End If
End If
' pause so user can view the console output
Console.ReadLine()
End Sub


End Class
 
You code and words contradict each other...
You said you want to send something to printer.
But you code says networkStream.Read as if you trying to read something from
printer.


Here is the code i am using


public bool SendBytesToPrinter(byte[] p)
{
try
{
IPEndPoint ipEndPoint;
ipEndPoint = new IPEndPoint(IPAddress.Parse(_sName), 9100);
Socket socket;
using (socket = new
Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp))
{
socket.Connect(ipEndPoint);
socket.Send(p);
socket.Close();
}
return true;
}
catch (Exception e)
{
//TODO: do something with exception
return false;
}
}


George
 
You code and words contradict each other...
You said you want to send something to printer.
But you code says networkStream.Read as if you trying to read something from
printer.

Here is the code i am using

public bool SendBytesToPrinter(byte[] p)
{
    try
    {
        IPEndPoint ipEndPoint;
        ipEndPoint = new IPEndPoint(IPAddress.Parse(_sName), 9100);
        Socket socket;
        using (socket = new
Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp))
        {
            socket.Connect(ipEndPoint);
            socket.Send(p);
            socket.Close();
        }
        return true;
    }
    catch (Exception e)
    {
        //TODO: do something with exception
        return false;
    }

}

George




Hello,
Click to expand...
I am trying to write soem code that will send data to an Oneil
printer
over our network. I know the printer works and is setup correctly
because I can print to it from there software. In my program i am
getting this error.
Click to expand...
System.IO.IOException was unhandled
 Message="Unable to read data from the transport connection: An
existing connection was forcibly closed by the remote host."
Click to expand...
I will post my code below. Any help would be great.
Click to expand...
Imports System.Net.Sockets
Imports System.Text
Public Class Form2
Click to expand...
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
       Dim tcpClient As New System.Net.Sockets.TcpClient()
       'tcpClient.Connect(hostname,  port)
       tcpClient.Connect("10.0.9.106", 515)
       Dim networkStream As NetworkStream = tcpClient.GetStream()
       If networkStream.CanWrite And networkStream.CanRead Then
           ' Do a simple write.
           Dim sendBytes As [Byte]() =
Encoding.ASCII.GetBytes(" EZ{PRINT,STOP350:@20,35:ZP08A|003|")
           networkStream.Write(sendBytes, 0, sendBytes.Length)
           ' Read the NetworkStream into a byte buffer.
           Dim bytes(tcpClient.ReceiveBufferSize) As Byte
           networkStream.Read(bytes, 0,
CInt(tcpClient.ReceiveBufferSize))' --->  this is the line giving me
the error
           ' Output the data received from the host to the console.
           Dim returndata As String =
Encoding.ASCII.GetString(bytes)
           Console.WriteLine(("Host returned: " + returndata))
       Else
           If Not networkStream.CanRead Then
               Console.WriteLine("cannot not write data to this
stream")
               tcpClient.Close()
           Else
               If Not networkStream.CanWrite Then
                   Console.WriteLine("cannot read data from this
stream")
                   tcpClient.Close()
               End If
           End If
       End If
       ' pause so user can view the console output
       Console.ReadLine()
   End Sub
Click to expand...
End Class- Hide quoted text -
Click to expand...

- Show quoted text -
Click to expand...

How can i convert this to VB?
 
You code and words contradict each other...
You said you want to send something to printer.
But you code says networkStream.Read as if you trying to read something from
printer.
Click to expand...
Here is the code i am using
Click to expand...
public bool SendBytesToPrinter(byte[] p)
{
    try
    {
        IPEndPoint ipEndPoint;
        ipEndPoint = new IPEndPoint(IPAddress.Parse(_sName), 9100);
        Socket socket;
        using (socket = new
Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp))
        {
            socket.Connect(ipEndPoint);
            socket.Send(p);
            socket.Close();
        }
        return true;
    }
    catch (Exception e)
    {
        //TODO: do something with exception
        return false;
    }
}
Click to expand...
George
Click to expand...

news:[email protected]...
Click to expand...
Hello,
I am trying to write soem code that will send data to an Oneil
printer
over our network. I know the printer works and is setup correctly
because I can print to it from there software. In my program i am
getting this error.
System.IO.IOException was unhandled
 Message="Unable to read data from the transport connection: An
existing connection was forcibly closed by the remote host."
I will post my code below. Any help would be great.
Imports System.Net.Sockets
Imports System.Text
Public Class Form2
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
       Dim tcpClient As New System.Net.Sockets.TcpClient()
       'tcpClient.Connect(hostname,  port)
       tcpClient.Connect("10.0.9.106", 515)
       Dim networkStream As NetworkStream = tcpClient.GetStream()
       If networkStream.CanWrite And networkStream.CanRead Then
           ' Do a simple write.
           Dim sendBytes As [Byte]() =
Encoding.ASCII.GetBytes(" EZ{PRINT,STOP350:@20,35:ZP08A|003|")
           networkStream.Write(sendBytes, 0, sendBytes.Length)
           ' Read the NetworkStream into a byte buffer.
           Dim bytes(tcpClient.ReceiveBufferSize) As Byte
           networkStream.Read(bytes, 0,
CInt(tcpClient.ReceiveBufferSize))' --->  this is the line giving me
the error
           ' Output the data received from the host to theconsole.
           Dim returndata As String =
Encoding.ASCII.GetString(bytes)
           Console.WriteLine(("Host returned: " + returndata))
       Else
           If Not networkStream.CanRead Then
               Console.WriteLine("cannot not write data to this
stream")
               tcpClient.Close()
           Else
               If Not networkStream.CanWrite Then
                   Console.WriteLine("cannot read data from this
stream")
                   tcpClient.Close()
               End If
           End If
       End If
       ' pause so user can view the console output
       Console.ReadLine()
   End Sub
End Class- Hide quoted text -
Click to expand...
Click to expand...
- Show quoted text -
Click to expand...

How can i convert this to VB?- Hide quoted text -

- Show quoted text -
Click to expand...

I figured it out. Just in case other people are having the same
problem here is the code i used.

Dim clsError As System.Net.Sockets.SocketError
Dim bMessage As Byte() =
System.Text.Encoding.ASCII.GetBytes("EZ{PRINT,STOP350:@20,35:ZP08A|
003|}")
Dim clsSocket As New Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp)
clsSocket.Connect("10.0.9.106", 515)
clsSocket.Send(bMessage, 0, bMessage.Length, SocketFlags.None,
clsError)
 
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