Closing Socket Each Time?
May 5, 2009
In my small P2P Chat application I am listening on a port for messages and if some message arrives and pending, I am accepting it to a TcpClient and reading the data from the stream, writing back a "Received" response and closing it. This is in a loop with a sleep interval of 500 secs and runs in a separate thread. Is it a good practice to close the socket each time I receive and process a message or should I keep it alive till the chat box is closed on other side?
I am asking this because, when I do a "NETSTAT" on command line while chatting with someone, there is one entry per message that arrives locally. and many ports get to TIME_WAIT status, even if it is understood that they will be removed after 2 mins by the system.
View 3 Replies
ADVERTISEMENT
Feb 6, 2011
I have closed the client socket using client.close() but netstat command shows the same socket in time-wait state.Because of this I am unable to reuse the socket..
View 2 Replies
May 31, 2011
I'm having a hard time figuring out while a HttpWebRequest in .NET 4.0 creates a socket connection for each request but isn't able to close the socket afterwards.When I execute e.g 50 HttpWebRequests I see 50 TCP socket connections in the WAIT state in netstat.
[Code]...
View 2 Replies
Jan 5, 2012
I m into automation development of FMCG products using Micro-controllers. I get real time data Barcode 2D from TCP/IP connection. My task is to compare the result do some Computation with them and Store the incoming Barcode and results into a Excel sheet in a folder. I m successful with the basic working. Am currently working at slow speed of 1 barcode(22 char info) per second from the TCP/IP data (barcode scanner). Now, comes the real issue. I need to process atleast 5 barcodes per sec ( <200ms per process). I m partially successful with 3 Barcode per second(300 ms per process). so, thats like 300ms per processing. I need to achieve less than 200ms for entire processing. I have used threads and timers. but I m unable to achieve. Seems like storing in Excel takes more than 250ms. Since i come from micro controllers background 1msec is a lotta time to process for me. I m not sure how much time does it take and trust me i find it difficult to guage the time here.
View 1 Replies
Feb 21, 2010
I have two child forms that open from the MDI Parent.My question is when I close one of the child forms all others will close also.
View 2 Replies
Aug 3, 2009
my program is design to receive a pup-up forms.i wnt this result..if i received a popup forms it will close automatically for 10minutes..the problem is i don't knew how to do it using timer.
View 5 Replies
Oct 26, 2010
Using ASP.Net, VB.Net When i close or exit the page, it should show the pop up message like "page closing"
View 4 Replies
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
May 26, 2009
i'm using socket programming in vb.net 2005 and make a Server/Client windows application and it used in the network to multi user chat server and havent error and it work , but one BUG in server app : the Server app. work currently until the number of clients more than 30 and then it crashed . and error is "socket.exception" . now tell me what to do ??? it's very very important to me because the number of server's CRASH in on day more than 10 time and i end it and then run again and it's not good for my job .
View 5 Replies
Oct 15, 2011
Below is my code, but when i send the message thru client socket i receive Specified argument was out of the range of valid values. Parameter name: size
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim serverStream As NetworkStream = clientSocket.GetStream()
Dim outStream As Byte() = _
System.Text.Encoding.ASCII.GetBytes("0800822000000000000004000000000000000920092126012345001")
[CODE]...
View 1 Replies
May 3, 2010
Form1 is a mdi container. It has a bunch of forms that can load inside of it as mdi children. If I close each open form inside the form1, and then click the red X at the top right, application exits fine.If I click the red X without closing the forms inside I get: An unhandled exception of type 'System.CannotUnloadAppDomainException' occurred in mscorlib.dll
Additional information: Error while unloading appdomain. (Exception from HRESULT: 0x80131015) However I can break from it. How do I get the application to not show that error? What must I do to fix those inside forms or close when the red x is clicked?
View 1 Replies
Jun 4, 2010
Dim frm As Form
For Each frm In Forms
Set frm = Nothing
Next frm
The above code is what I used in VB6 to close all forms associated with my programs before my program closed. I have been searching for information on how to make sure all forms are closed when closing a VB2008 program.
I have seen info on using the Project Property Shutdown mode When startup form closes and I currently have this set.
Is this all that is really necessary? Will the garbage disposal close everything else to free up RAM?
Also, if I have several forms open and want to close all from the main form without closing each one individually, what is the best approach? Is there a collection like in VB6, go through the collection, compare it to the name of the main form and close it if it is not the main form?
View 4 Replies
Apr 27, 2011
I have the following code to close a form which is a child. The problem is that when it closes, it closes the MDI parent too.
Private Sub frmTransaction_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
If ListView1.Items.Count >= 1 Then
[Code]....
View 4 Replies
Sep 6, 2009
I have an ASP.NET application with a SQL Server back end. I am storing all my dates in UTC format and doing the appropriate conversions to the local time zone of the browser viewing it. One of the pages asks for a start date and end date (no times).
I am taking the start date and setting the time to 00:00:00 hours (midnight) and I'm taking the End time and adding a time of 23:59:59, so that the date range covers the whole day. Now what I'm trying to do is do a SQL query to do a search for records in this date range. The problem is, the data in SQL is in UTC time and the user is typing their dates and times in their local date and times. My quickest solution was to convert the date and time to UTC, then search the records. However, by doing this, I am to believe ASP.NET converts the given time and date to UTC based on the server time zone. How can I convert a date and time to UTC time based on the time zone of the user?
View 5 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 9, 2011
how do I keep a Socket declared forever so i can call it in other methods?
All the tutorials i've read just have a server, client, server sends client message, client disconnects. What if I want to remain connected? I've tried making the sockets global but that didn't work somehow.
View 1 Replies
Apr 17, 2008
I have a socket which I use to monitor data on a specific UPD port (Let's say 1200).[code]...
View 3 Replies
Apr 9, 2011
Then I ran into problem #1 - I wanted to call the methods in another sub but they were shared so I received the error:"Cannot refer to an instance member of a class from within a shared method without an explicit instance of a class"o, I took out shared since I didn't know how to fix it, and put in the Following as Global Variables:
Public listener As System.Net.Sockets.Socket
Public handler As System.Net.Sockets.Socket
Public client As System.Net.Sockets.Socket
[code].....
View 1 Replies
Mar 22, 2012
i can connect socket well but i want to ask how can i determine that socket has received data i want to create sub or function that handles socket.receive byte the code i have is
Dim byteData(100) As Byte
Dim size As Integer = soc.Receive(byteData) 'receiving the data from socket and reading its size
For i As Integer = 0 To size
Console.Write(Convert.ToChar(byteData(i))) 'Convert.ToChar will convert the byte value into character
Next
i want to start this code each time when socket receives something?
View 1 Replies
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
View 1 Replies
Nov 26, 2010
I have the following class in a Windows Service that is experiencing some vary strange shutdown behaviors. The server is shutting down from time-to-time with only this message in the event logs and no messages in the trace logs, "The Broadcaster service terminated unexpectedly. It has done this 1 time(s)."
[Code]...
View 2 Replies
Aug 7, 2009
Using the Socket raw, with XP I can read without problems both the incoming packets and the outgoing packets. With Vista (I have tried also others Sniffers) is impossible to see the outgoing packets...WHY? what I have to do to see alse the outgoing packets? In reality I have not to read packet data or packet lenght... I need only to count the number of incoming packets and outgoing packets... but with Vista this job seems impossible... or not?
View 1 Replies
Sep 21, 2011
I want to access a socket that has been opened for me by my service providers. Their socket is written in PHP and I don't understand PHP at all. Themselves they don't understand VB.Net
The Code in PHP as as below
<?
$num = $_GET['num'];
$ext = $_GET['ext'];
[Code].....
View 2 Replies
Nov 22, 2011
how to create tcp socket in runtime. suppose i want to create a 1 to 100 array of a socket and sending data by it how can i do it
View 1 Replies
Sep 27, 2011
i am working on 3rd party chat software, when ever i send data to server i get incorrect buffersize of data. like when i convert that data to hex to matching header for splitting data i got huge lengths data
in the above textbox of image i have got some 0000000000000000000.... with the hex data, how can i get only only original data. The code i have used to receive data is
[Code]...
View 1 Replies
Oct 18, 2009
I am into minds about how can i learn about programming soket or network.I want to you give me a website guid me about that.
View 2 Replies
Jan 12, 2011
this is the first time I try to study the socket of .NET. I configed follow the tutorial here [URL] . Then I try to write some execute code for my project. I insert an "Add item" to a listbox after socket server receiving Data from client. However, the server doesn't execute my "Add item" code and it disconnect to the client? If I erase this code, everything is ok!
[Code]...
View 6 Replies
Aug 3, 2009
i have made a console based socket program in vb.net, all it does 2 things:
1- server shows a msgbox when the command msg is sent from the client
2- the server opens the cd try when the command open is sent form the client
when i run it , i type the command open and works just fine , the cd tray opens , but if i type open again or msg it simply wont do anything(this also applies for the command msg, if type it a msg is shown, but if i type it agine or open , it wont respond. so its like one command per session. i tried to put the code in a while loop , but didnt work?
here is the code for the server:
Imports System.IO
Imports System.Net.Sockets
Module Module1
[code]....
View 2 Replies
Jan 19, 2010
There are a series of web requests, database handling using php as well as using mysql connector. There are at most 5 timers in one window. some window has 3 or 2 timers as needed.Among some features there is a feature for chat. and I'm doing it with Remote mysql connection using mysql data connector.I'm not much familiar with VB.NET coding environment as well as with optimization issues. However made that app running with some problem, that is, when chatting, sometimes its not working smoothly sometimes stops for 4-5 secs then again responding. I'm not sure if this is happening because of timers. However a chat window has 2 timers of 1sec each.
View 2 Replies
Dec 5, 2010
I've experimented a bit with async TCP socket messages between two programs, for passing data, numbers and/or text. What I've done is to use a keyword in the start of each message,and then seperate the values with the "|" character. So a message may look like this: "DATA|490|40517.9328222222|1|6|11345|11347|11344|11345|106|40517.8494212963"I set the read buffer size to 1024, as most of the messages will be within that lengthHowever sometimes I may send rapidly many short messages where several together are less than 1024 characters, and it seems then it will be read in one go. And if I send a message longer than 1024 characters, it will be split. So I'm looking for some advice on how to handle this. Should I use some special characters to start and/or end each message?
View 6 Replies
