VS 2008 System.Net.Socket Connection Status?
Dec 8, 2009
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?
View 6 Replies
ADVERTISEMENT
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.
View 1 Replies
Feb 28, 2011
i need a little advice/help here. There is a particular scenario that is coming up and I am clueless as to how to go about it."I will soon have a lease line through which I will get realtime stock market data. This data will be available every second and it will contain prices of stocks. Now assume I am able to get that data on my local computer. How can I transmit data so that users can get that data through my software.
For e.g. assume it's 11 AM. Now if you select a stock e.g. Google, then my program should fetch data for google till 11 AM and also show new data every second or so with minimum lag. Something like a terminal where you see stock prices getting updates every second. In my case I need to get past data and show current data which get updated at short intervals."
Now I have a linux vps webserver which hosts my site. (I get one or two static ip free) What to do so that data goes from my local computer to my server and then my program (developed in vb.net) is able to get it and show it to end user. This whole system should such that its fast (real-time) and delay is minimum.
View 6 Replies
Aug 3, 2009
Event 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.
[Code]...
View 1 Replies
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 ...");
View 1 Replies
Apr 29, 2010
is there a way in ftpwebrequest to get the status of the connection? In VB6 using inet component you can use Statechanged, is there a similar way to do the same with ftpwebrequest?
View 2 Replies
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]...
View 2 Replies
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]...
View 1 Replies
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] .....
View 4 Replies
Aug 11, 2009
I'm using system.diagnostics.process to launch a web page in the browser: system.diagnostics.process.start("http://........").
It works well. My question is how to get a return value? What if the browser has failed to launch the address or I'm not connected to internet? Can I catch it by any return value?
View 3 Replies
Jul 25, 2011
how do i check for sql connection status constantly. Timer?
View 4 Replies
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]...
View 9 Replies
Sep 11, 2011
Am developing a server - client application using the system.net class , that will have more than 5000 simultenous client connection.what is the best way to manage multiple client connection like this?
View 3 Replies
Mar 24, 2012
I converted some codes from python to VB 2010. My aim is sending query data to multicast IP and get the response. My query data receiving from device which is connected to my LAN. Also the device responding my query and my PC receiving the responce but at this point the VB program freezing.getting response data and printing to console without freezing.
This is the code list;
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
[code]....
Here is the Wire Shark (Network Protocol Anlyzer) screen shots; My computer IP is : 192.168.0.11 and device's IP is : 192.168.0.10.
View 2 Replies
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.
View 9 Replies
Mar 26, 2010
I am trying to use the code from Microsoft for an Async Socket connection. It appears the listener runs in the main thread locking the GUI. I am new at both socket connections and multi-threading all at the same time. Having a hard time getting my mind wrapped around this all at once.
[Co0de]...
View 1 Replies
Jun 8, 2011
I have a problem when trying to detect the computers network connection status.
Here is the code I have used:
Dim IsAvalible As String = My.Computer.Network.IsAvailable
If IsAvalible = True Then Label1.Text = "Connected" Else <code>
<code>If IsAvalible = False Then</code> I <code>
Label1.Text = "Disconnected"</code></code>
End If [/ICODE] End If[/ICODE]
But for some even when the network is disconnected or the computers wifi is turned on I still get the result of "Connected". I think there something wrong with the code.
View 2 Replies
Apr 25, 2010
I am developing an application with VB using the MySQL Connector Net [URL]. Now each time I go to load data in to a datagridview or in to text boxes on a form, I have to provide something along the lines of:
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
'Create connection to MySQL Database
Dim conn As New MySqlConnection
Dim myCommand As New MySqlCommand
conn.ConnectionString = MySQLGlobal
[Code] .....
I think it would be better to leave the connection open to the MySQL database while the application is in use. That way I can just continue to execute queries of inserting and updating, without having the delay of the application having to reconnect. Is there a way where I can create some sort of background task in the application that monitors every few seconds that the connection is still active, and if not it tries to reconnect until its reconnected? I am trying to have it so that then I can code it to just do queries, and when the connection breaks - it disables the form until it is reconnected.
View 4 Replies
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]...
View 1 Replies
Apr 1, 2009
I would like to know can we use a socket connection on vb to communicate with PC without using GSM modem and SIM card.for example, like sendin a simple text msg to the PC and it will reply back the result back to me the result.
View 1 Replies
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?
View 1 Replies
Jul 9, 2011
I have a MDI form with twe menus - Login(&L) and Exit(&X) If I click the Login(&L) menu, a login form will pop up.
[Code]...
View 1 Replies
Dec 27, 2011
I am Using Visual Basic 2010. I want to check My Connection Status. Connected or not in Remote Server Connection (SQL Server 2008 R2). How To Check Connection Status..?
View 1 Replies
Oct 25, 2010
I have a program that connects to an ODBC tables (3 of them) and I use select .... Left join etc Where ... etc. The issue I have is the connection takes about 20 to 25 seconds to complete. I'd like to create some status message so the user knows the system is not actually hung. Using Visual Studio 2010 Ultimate, VB.NET, ADO 2.7.
View 1 Replies
Jan 17, 2012
I have a small application shared by 5 users. The application uses an Access 2007 database located on a local network server. My question is: Whenever a user logs into I save it's connection status on a table. When using OleDb is there a way of getting something like a unique "session id" for the user logging in?
View 2 Replies
Feb 23, 2011
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 Replies
Aug 3, 2011
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.
[Code]...
View 2 Replies
Sep 15, 2009
The MSDN Documentation in question can be found here:[URL].. It offers the following code snippet example:
[Code]...
View 2 Replies
Jul 15, 2009
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
[Code] .....
View 16 Replies
Oct 13, 2011
I am in the process of developing an application for one of my clients. I am not going into the details of the applications, but brief facts of the same. The application is divided into two tiers (actually three, but the third tier is the database (SQL SERVER) so that is not included). The top tier (or first tier) is a web application (ASP.NET) where the users shall log into the system and use the application. This web application will also access the Database directly. One important activity the users shall do is uploading excel files with various information to the server. Web Application once the upload is successful shall enter the details in the in Database about the upload along with an ID and save the excel file at a location in the server.The Second tier is a VB.NET Application which will run in the server. The application will connect the database and retrieve the list of excel file uploaded by the web application and start processing one excel file after another based on ID. The processing that will be done is very simple: read the excel file, check for certain parameters, do some calculations and insert the whole details into the database. (say some 100 records per excel file)
The server in which the VB.NET Application (Second tier) runs is hosting a serious of services and application which shall run simultaneously including the Database (SQLSERVER), web server. The Database also host tables and database for various other applications. In order to help in the smooth functioning of the system, it has been decided that the VB.NET shall do the processing activity only when the server is idle (including CPU usage is idle). I have searched the Net and found API to get the system Idle status. But the real question is how to pause the processing activity when the system switch from idle mode and continue when it is again back to idle mode. Please note that I am talking about system being idle because no other application is executing any activity except the VB.NET Application.
View 1 Replies
