Socket Programming - Close A Connection From Server?
Nov 24, 2011
I have the following code in my Server Form:
Imports System.Net, System.Net.Sockets
Public Class ServerForm
Private serverSocket As Socket
Private clientSocket As Socket
[code]....
for the first time, when I click on Connect, it is going to connect to server as well and also it works if you click on the disconnect. for the second time if you click on the Connect button, it gets connected but the disconnect button is not working.
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May 21, 2011
I wrote a Socket Client which will send the Socket Server some data and get some response from Server. This process will be running once in every 2 seconds.
Now what I need to know is How we can identify the connection lost between Server and Client?
I need this to be implemented in the Client side. If there is no connection then Client should automatically close the connection. Once the connection with the server is available in the next attempt it should connect automatically.
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Jan 2, 2012
I am using socket programming in vb.net to create a server client remoting application. The problem occurs when I use both the client and server in a win 7 box. It works fine for win xp or cross-platform communication (e.g. win xp to win 7). Below are the codes used at the client and server end:
[Code]...
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Jul 14, 2009
how to access client side activity i.e. which client is connected and which computer connected at the same time from server.
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Feb 2, 2011
I am facing problem in asynchronous socket communication.
1)I wanted to perform connect(from client to server) operation on enter button and send the data whatever client want to send and disconnect from server. And again client should get connect to server whenever client wanted to send data. this is the mechanism.
i.e how to reuse the socket.
2)Again Server should able to send the data to client.
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Jan 12, 2012
I created a server-client application using the asynchronous socket. I found the problem when closing a socket on the server, applications so closed. The procedure that I do to close the socket server is:
Terminate the listening thread. Close the client socket is still connected to the server. Close the server socket.
How to prevent the application is closed, when I close the server socket?
Protected Friend Sub CloseServerSocket(ByVal IPAddress As IPAddress, ByVal socketPort As Integer)
' Terminate the listening thread.
[Code].....
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Apr 23, 2012
For almost a week I am reading and trying to find a solution for checking connection state using a TCP Client (using socket class) In my scenario I have a TCP Client that is connected to a server (it is not controlled by me) and i want that from time to time to check the connection state, and reconnect if necessary.I have read a lot of information on the internet but i did not find a suitable solution.Briefly, these are the methods that i have found on the internet and try to implement.But unfortunatelly, i have found some scenarios where the TCP Server is closed and the TCP Client is still saying Connected 1.Example from MSDN
[code]...
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Sep 13, 2011
I want both the client and server to write and read resp. at a constant rate (which can be configured on the GUI of the client) to the buffer.I am able to send from the client at 150 bytes per packet Now, I should be able to read also at 150 bytes per packet on the server too Since, both are connected through a socket, can we retrieve the socket params (set on the client size, like 150 here) from the server end, using the tcpServer object.Or is it must to send an initial setup packet which tells about these client params and so accordingly the server can continue?
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Jan 8, 2010
I have been struggling to find a solution for this problem. What I need to do is build a server application that accepts tcp client requests from different clients running on same port say:1003. I experimented by using asynchronous mode call backs etc. but it disconnects once connection is established and does not respond for further requests from the same client.
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Oct 14, 2011
I am performing a simple exercise of opening an SQL Server database connection, pulling the first record of a table from a DataReader object, and then closing the object. However, I have noticed that theres bit of a delay, about 5 seconds or so, in closing the connection. However, the delay only occurs after the command object executes the specified query. I've worked in a setup like this before and don't remember there being such a long delay while closing the connection. [Code] The connection closes almost immediately. What gives? I have narrowed it down to the where the .ExecuteReader line that causes the delay in the connection close. Whats causing the delay and how do I resolve it?
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Feb 23, 2010
i'm creating an Asynchronous socket programming in vb.net. i've utilised the code from Asynchronous client and server code frtom the following links:m a new user so could post only one link fully)When I try to connect the for more than one client the second client always waits until the first clientcompletes the call. i want the clients to accept calls at the same time
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Jan 25, 2008
how to do socket programming in VB. I'm using VB.NET 2008 and i'm a novice but with a reasonable understanding of programming so I want to learn by examples and understanding it in a novice/intermediate point of view. Essentially, I want to create a simple TCP or UDP client that can connect to an IP and port and retrieve the stream for parsing of content.
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Mar 8, 2011
I've been making this project for our Major course in Networking Principles and Programming. Our project is an ATM System but with the use of Socket API. My partner and I chose VB.NET even if we're completely beginners.
We've researched about Socket programming in VB.NET, and we're glad that our Client-Server connection worked out. The problem is, our system contains many forms (Withdraw, Deposit, etc). We've researched the Google about Socket Programming in many Window Forms and unfortunately, we can't find any.
How can we be able to maintain the connection with many forms? Or do we have to create a new connection on every form? Is it better to create only ONE form for the client application perhaps?
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May 4, 2010
i'm currently using my computer as host and client.. i ran the program and the console application for the server started.. but how will i be able to run the form application for the client? can VS run 2 programs at the same time?
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Mar 16, 2010
How can I create a socket created with programming
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Feb 25, 2011
I'm having errors when I try to forcibly close a socket program. I don't know what is the right exception to use.
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Oct 28, 2009
am developing an application where a client send data to server (socket Programing) and the server recevices it and shows it to the user through a list view but the client can send the data any time they want and it should show on the list view automatically... So i have put a timer and in tick event i have written the code like this the below code is working fine in onload event but then only once the client can send the data to the
server.
[Code]...
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Feb 17, 2010
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.
[Code]...
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Feb 17, 2010
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.
[Code]...
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Apr 18, 2011
I need to include in my application that can receive connections from a client( or two).I am thinking, that I would like to have the clients send a "TelegramID" so that I may now how to process the code.Following the "TelegramID" would be a structure that would need to be processed.So far, I can use a single client and send just plain text but need some direction for my end goals.
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Apr 9, 2010
i am a newbie in socket programming and remoting.May i know where lies the difference between the socket programming and remoting? Where do i start off to learn the basics of the socket programming?I haad a goo with the google search but unfortunately the search outcome results are a bit tough for me to understand
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Mar 6, 2009
I realize this is a broad question, but how do I recieve / send packets. I know what packets I need to send and what Im going to recieve, but I dont know how to send / recieve them.
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Sep 28, 2009
I'm writing a GUI-based app in VB.net that talks to a LambdaMOO server via telnet, sends commands to display the object hierarchy, then parses the output and creates a visual representation of the object hierarchy.So my question is: is there some kind of "telnet client" class for .NET to simplify the sending and receiving of data, or do I have to write my own using the socket API?
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Nov 24, 2011
I'm developing a VB.NET class that connects to one machine that has TCP/IP ASCII communication. I'll show the code and try to explain what is the problem:
CODE:
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Nov 30, 2008
i make a class and when i call on form then that error occurs "ExecuteNonQuery requires an open and available connection, the connection Current stat is close "
Class Code isImports System.Data.SqlClientImports System.DataImports System.StringPublic Class DatabaseKits Dim Cn As New SqlClient.SqlConnection Public Function BuildConnection() As Boolean Try Cn.ConnectionString = "Persist Security Info=False;Integrated Security=True;Trusted_Connection=Yes;database=BizAimsPro2008;server=Server-2k3s" BuildConnection =
[code]....
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Jun 22, 2011
I have my index.aspx file:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="index.aspx.vb" Inherits="Web_Socket.index" %>
<!DOCTYPE html>
<html>
[Code]....
so now my question is how do i connect the WebSocketServer.cs to the index.aspx ?
As a start, all I'm trying to accomplish is just to get the Web Sockets working, and have the connection established, which then will alert("Stock Ticker Connection open ...");
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Oct 26, 2011
I made a simple TCP server (I've found the example on the web) in VB to receive data from about 40 TCP clients.The clients are not synchronized but sends data about every 18 minutes; the problem is sometimes several clients sends data at the same moment, so I can't receive data.I also made a second program that reads the data (server program writes data on a file, read from the second program) scheduled.
My question is this: I've seen on the web examples about Multithreaded Server Socket Program, so I suppose this could manage my 40 clients (but now the clients are syncronized and send data at the same time in client mode) or is better get data (I have a central client that asks data to all 40 devices in server mode)?
Second question: can I make a single program where I run both TCP client and TCP server at the same time?
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Aug 1, 2008
I'm working on an application that communicates to torque controllers on the factor floor. The user inputs an IP address and a port and clicks the btnConnect button to make the initial connection. Once that completes a KeepAlive message must be sent periodically to maintain communication with the torque controller. The initial connection works very well but a socket error (see below) grinds everything to a halt when the KeepAlive message is sent. I would appreiciate any ideas the readers may have on the root cause. I'm quite confused because basically the same code is use for both the initial connection and then the KeepAlive messages. I have pasted some of the code as well below.
[code]...
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Nov 22, 2010
I am trying to make a class that will allow me to open a socket, leave it open and then write to it when needed. I wrote the following code but whenever I call the writeData sub I get an error with the network stream. Its says it is not an open connection. I call the connection sub first and then the writeData sub.
Imports System.Net.Sockets
Imports
System.Text
Public
Class vizSocketConnect
[Code] .....
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Mar 23, 2012
I have codes which is written with python. I am not good with python and i want to convert this python codes to VB 2010.This python function searching local network and finding my LG TV's local IP adress. I want to find my TV's local IP with VB 2010.
[Code]...
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