Is there a way to determine if a System.Net.Sockets.Socket has sent data that has not been received/read by a specified remote endpoint with a connectionless protocol?It never hurts to try.
View 1 RepliesEvent type clr20r3 p3 4a5c12c0 system.net.sockets.socket Exception and Application crash on some system. while running well on others. i go thorugh many forms and search a lot on google but not able to resolve the issue.
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I have a chat program using System.Net.Sockets.Socket that works perfectly over LAN.My question is - will this same program work over the net with little or no modification and if so do i provide the client with the IP of my machine or of my router and use port forwardin
View 1 RepliesThe MSDN Documentation in question can be found here:[URL].. It offers the following code snippet example:
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I'm attempting to discard the contents of a System.Net.Sockets.Socket send buffer using theSocket.IOControl(IOControlCode.Flush, .... Does anybody know whether VB.NET supports this command? I've tried supplying 'Nothing' and 'Nothing' for both required parameters, also empty and populated byte arrays in combination with 'Nothing' for both required parameters, but I consistently get an 'Invalid argument' exception. I've tried a web search for an answer, but the only mention I've found was a question asked about 8 years ago, with still no answer.
View 1 RepliesI have created a Client that can send and receive data via TCP sockets. The objects stored on the serverside are the *exact* same object used for the client. They use the same send and receive protocols.
Now, when i send a string from the server to the client , it does precisely what it should do. However when I send a string to the server.... I do receive the string as an equal length of NULL characters. I run the server and client locally.
Basicly what can influence the behaviour between two completely identical objects performing the exact same task? I wonder if there is some socketflag issue if the TCPlistener.accept function returns a completely different setup then the one I R used to.
(if it is of any interest, the send protocol is asynchronious)
I'm coding a simple TCP client/server in VB.NET to transfer files of all sizes. I decided to use System.Net.Sockets's command SendFile to transfer the bytes through the socket.
On the receiving side, my code to retrieve the bytes works fairly well, but occasionally the transfer randomly stops. I figured out that by putting a small sleep delay between retrieving the next block of data makes the transfers 100% stable.My code to retrieve the data (until there is no data available) is simplified as this:
While newSocket.Available > 0
Threading.Thread.Sleep(100)
newSocket.ReceiveFrom(data, Remote)
End While
I really hate using that sleep delay and figure there must be a proper method/function to retrieve data from SendFile?
I have a device which send me data over a particular port. The data is in XML Format.
Now I already did a small console application which listen for the data and print out the data on the screen.
Now my plans are to deserialize the xml data or I will create the insert statement into the database.
1) The device send me the data every second (if there is data to send me).
2) I cannot say how much data the device is going to send me.
How can I make sure to capture all data without loose any information..
I have been developing an async socket connection server and client program. I have been testing it, and noticed that if I connect to the server from my client and then disconnect. Upon reconnecting I am on a different port(local IP still). This is fine, however when I go to send a message, and the server trys to update all the clients, it eventually hits clients that do not exist anymore. I get the SocketException 10054, and upon connecting/disconnecting enough, it no longer works at all. My question is how do I clear out these no longer useful sockets from the server? I am doing currentsocket.Shutdown(SocketShutDown.Both); and then a currentsocket.Close(); after that. When a user disconnects.
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I'm trying to update an application from vb6 to vb.net. The orig app used the winsock control. Unfortunately I can't nor do I want to use it in the re-write. Are there any decent public classes with events that wrap the Socket class?
View 1 RepliesIs it possible to filter the incoming and outgoing data on a COM port terminal... to distinguish it?
View 2 RepliesDo you all have any updated websites that provides tutorials about the system.net.sockets namespace?
View 1 RepliesI'm using System.Net.Sockets namespace for connecting to an ftp server. If a user has to login to a firewall first though, I'm not too sure what to do. The following is what I have working for logging into an ftp server without a firewall. (The Else statement) Do you know what I might add to the if statement? In the method where this conditional is, I am passing a firewall username and password.
m_tcpClient = New TcpClient
' Try to connect to ftp site
' If using firewall, login to it first then issue another command to log in to actual
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I got 11 errors in my VB program. All the errors look similar: X is ambiguous in the namespace Y
Error line: Imports System.Net.Sockets
Imports System.Text
Module Module1
Sub Main()
Dim serverSocket As New TcpListener(System.Net.IPAddress.Parse("192.168.1.100"), 8888)
How would I use this for a chat client? I'm not sure where to even start and the internet is helping me find much about it.
View 4 RepliesThe problem is yahoo changed there login URL Structure. I have placed a peice of the code below.
Dim LoginPacket As String
LoginPacket = "GET http://login.yahoo.com/config?&login=" & txtLEmail.Text & "&passwd=" & strPass.Trim & " HTTP/1.0" & vbCrLf
LoginPacket = LoginPacket & "Accept: */*" & vbCrLf
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I am doing client/server socket based project and currently I am having some troubles with the recieved result.What I mean ... this is part of the client which is receiving
tcpClient.Connect(address, Port)
Dim
bytes(tcpClient.ReceiveBufferSize) As
Byte
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Where file is just a simple file name send from the server. What I recieve is for example: test.txt%00%00%00%00%00%00%00%00 etc. The server and the client are using the same encoding ASCII.
I have a problem reading data from an RFID-reader. I connect to the reader by tcp and wait for DataAvailable to be true, then reading the data until I got a end of data character. Then I just go back and waiting for a new DataAvailable. This is done in a own thread for the function.
There seems to be some kind of timeout, If I don't got any data in a couple of minutes, then it just sits there in the do/loop waiting for DataAvailable. I hold the card to the RFID reader, it beeps, but there is no data available. I don't get any exeptions, and the information says that the clientsocket is still connected. Are there anything more I can check?
If I put the card to the reader in a minute-interval it seems as this will never occur. So 2-3 minutes idle:ing seems to do this.
Here are my code to read data from the socket, I have taken away some irrelevant code:
Sub test(ByVal ip As String, ByVal port As Integer)
' this sub is meant to run forever
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i'm creating an IRC server and I already have a few base classes complete like logging and Config. I was about to start with programming the socket class(es) when I realized that I have no idea how to make such a complicated socket system. I do not under any circumstance want to use any other code than my own since that would not help me learn sockets. I am familiar with a single connection socket system like most tutorials use.
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Following is the code that I'm using for reading data over a .NET socket. This piece of code is run by a single separate thread. It works OK the first time, on the second iteration it stops at "client.Receive(buffer)" and never recovers from it. Initially I was using recursion to read data but changed it to iteration thinking that recursion could be the source of problem. But apparently it is not.
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Following is the code that i'm using for reading data over a .net socket. This piece of code is run by a single separate thread. It works OK first time, on sencond iteration it stops at "client.Receive(buffer)" and never recovers from it. Initially i was using recursion to read data but changed it to iteration thinking that recursion could be the source of problem. But apparenlty it is not.
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I wrote a server for a tcp/ip chat program using the system.net.sockets class. When I run the program and the client tries to connect to it, there's an error and it won't work. I am positive that the issue isn't with the client, as I have made a connection with the client before.
Imports System.Net
Imports System.Net.Sockets
Imports System.IO
Public Class Form1
Dim server As New TcpListener(IPAddress.Any, 60)
Dim client As New TcpClient
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im trying to detect if the connection is still active upon trying to send or receive anything. Now I have checks in place if it's connected then it will send or receive however... it's saying it's connected when it is not connected... and therefore my program tries to send and receive and errors.
I am determining if it is ok to send and receive by using the Socket.Poll(-1, SelectMode.SelectWrite)
if it's true then im connected and data can be passed..This seems to always be true until I send something and it fails..How can I catch the socket not being connected before it fails upon sending or receiving?
Question: How do I programmatically determine which provider to use (Microsoft.Jet.OLEDB.4.0 vs Microsoft.ACE.OLEDB.12.0) when my app runs as a 32-bit process on a machine with Office x64 installed?
I'm developing a VB.net WinForms app in VS 2010 and targeting both x86 and x64.The app processes data from xls, xlsx, mdb and accdb files using System.Data.OleDb:Dim oConn As OleDbConnection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=...")
The x64 version of the program works as expected. The x86 version works as expected on a system with Office x86.When I run the x86 version on a machine with Office 2010 x64, I get the following exception when trying to open a connection:
The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.I believe this is because I'm running Office 2010 x64 so the x86 data access components are not installed.I can get it to work for Office 2003 files (*.mdb and *.xls) by changing the provider to Microsoft.Jet.OLEDB.4.0.
How do I figure out which provider to use when running as a 32-bit process on a machine with Office x64 installed?Ideally, I'd like a function:If ProviderIsAvailableFor("Microsoft.ACE.OLEDB.12.0") Then
Else If ProviderIsAvailableFor("Microsoft.JET.OLEDB.4.0") Then
I Have a problem with vb.net. Basically I created an application that communicates via system.net.socket. on the server side of client connect, and a thread checks whether there are new incoming data. if there are data, puts them in a few tread declared variables, together with the "index" of the server. once this is done through "INVOKE" calls a routine that checks the incoming data andperforms an operation based on the data. I'll see what I do not work
Dim returndata As String = System.Text.Encoding.ASCII.GetString(data)
TextBox1.Text = ("DATA : " & returndata & "Socketindex =" & socketindex.ToString & " Index=" & index.ToString)
But that does not appear in the texbox, appears only "returndata", the rest c 'is same thing with the messagebox, individually, can display a messagebox with variable,but when I try to make a messagebox that displays them together, the texbox same thing!
And the same thing if I want to compare them with each other, for example
if index
= 0 then msgbox ("OK")
It does not work ...
I'm completely new to sockets etc.I'm trying to create an app that'll allow someone to send short information messages to several other people with the same app, using the internet and sockets(?)I've tried using code from online, but I'm getting no where.
View 4 RepliesI have an array of IP addresses, and I want to send the same data to all of them. I could just send the loop code that sends data but I think there's a better way of doing this.
View 1 RepliesFirst let me start off by saying that I have dealt with Winsock for MANY years and am attempting to convert my project over from vb6 to VB.Net.This program was made to handle up to 70 connections at a time and constantly sending data from Server to clients and back.
There is one packet however, that reaches up to be around 177kb when sent. The sockets are set up to sent 1kb at a time.... (No other packet actually uses the whole kb). It seems that after the server sends this large packet... the client receives the data out of order. After debugging and monitoring I find that it normally happens between 3-4kb. While the first 3 are good and in order.My question is, is there a different system I should use instead of just Sockets (I have had similar problems with TCPClient) and/or can someone maybe link me to a sample project that would not have this error?
I am reading data from a socket (as bytes) and storing this data in a string. Then later i need to access specific bytes within the string and do some math with them. However the bytes that I read back from the string are not what I am expecting.
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Occasionally I encountered this exception message while trying to download file from a server using System.Net.FtpWebRequest and System.Net.FtpWebResponse Object.
Download a file.ftpRequest_DL.Method = WebRequestMethods.Ftp.DownloadFile get the response object
Dim ftpResponse_DL As FtpWebResponse = CType(ftpRequest_DL.GetResponse, FtpWebResponse)
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