I am making a java chat server, and a guy was able to connect to it no problem (however, he logged off for the night before I ran into any problems, so I couldn't see what he did). Here is my code on the VB form:
[Code]....
So, in another related post, i got the chat to send to a java server, cool.Now, it's a matter of sending it back to VB.on the server side of things, (in java), I am using the following
JAVA
public static void sendback(String what2send) throws IOException {
ObjectOutputStream oos = new ObjectOutputStream(mySocket.getOutputStream());
[code]....
I am working on a chat client and server, and so far it works well, but when I close the client, the server throws an exception because it continues to try to do processes on the disconnected client. I have tried adding clientSocket.Close() in various places throughout the client and server with no luck. Does someone know how to add the disconnect code to either the server or client with this code?Server:
Imports System.Net.Sockets
Imports System.Text
Module Module1
[code].....
Read this: [URL]. Now the question: I want the client will connect to web server (or web hosting).
View 8 RepliesSo I have set up a basic client/server connection and I am trying to send a message to one another on connection, I got the client to receive the message from the server, but the server doesn't recieve the clients message. Here is my current code for reading the sent data from the client:
ServerThread.socket = new ServerSocket(5556);
Socket client = ServerThread.socket.accept();
DataInputStream in = new DataInputStream
[code]....
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]...
A friend and I are working on a project where we're required to build a reliable UDPclient/server using VB.Net. We have things working well, but one thing that still eludes us is how to dynamically allocate a (byte) buffer for the incoming data. Right now we have to hard code a maximum value/MTU (or use a really large buffer size and resize it once we've finished receiving). Does anyone know of a way that this can be done without needing to specify the receive buffer size?
Basically, before calling the receive function on the socket with a buffer of size x, we want to know x so we can allocate an appropriately sized buffer. Perhaps this is a problem in all socket programing that you just have to deal with??
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 Repliesi'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]...
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.
I'm running into an issue where I have a lot of AsyncSends going on with dozens of client sockets, and at the moment if any remote client stops receiving but doesn't actually disconnect, the app quickly eat sup all of the SocketAsyncEventArgs (aka an sae) I have preallocated because they're not released since the SendAsync is not completing. The obvious solution to this is to implement a per-client send queue, which sounds easy enough but I am unclear as to the specifics. I have one sae allocated per client to receive, which works perfect, and ideally I'd love to allocate a single sae to the client's async sends.
I understand popping in and asking a question that is veiled request for a 'give me code' solution is looked down upon, but I honestly have not been able to turn up a lot, either on the .XAsync methods, which Microsoft has a horribly poor example for, nor for a send queue in general.
Edit for @J.N.
I forgot to mention it, but I -am- actually using a bunch of preallocated sae's stored in a managing class that internally uses a ConcurrentBag. With one connection, in a test scenario where 20 small messages are sent per second (this is slightly more than double how many messages would actually be sent in the production server), the server eats up 500 preallocated sae's in a few seconds. If I implement 'create if empty' code, the sae count quickly climbs into the thousands.
I understand the functionality that the async methods of the Socket class provides, but if there's a network hiccup or something similar, this issue will outright bomb the server within seconds. A send queue sounds like an great solution, but I have no idea whether it's a good idea to do in a high performance production environment or not.
The base problem remains, though, that with a dozen messages per second per client being sent out, any network congestion or other factor that lags the connection but does not disconnect it will quickly deteriorate into a laggy mess.
I think a solution I might be looking for is something that locks up the single sae being used for sending until the completion callback is reached, where that sae is then unlocked and then reused to send any pending data. The actual implementation of it eludes me though.
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] .....
I've recently created my first serious Windows Service. It is a chat Server that can interact with a mobile Platform.Now If a Exception occurs in OnStart Sub you have no way of knowing there was an exception other than the misleading messagebox.I've Pinpointed the Exception to my fairly Simple log Class that Writes to a log file. Please look if you can see any obvious places where exceptions could occur. [code]
View 3 RepliesI'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?
View 7 RepliesMulti-User Chat Program (Server & Client) with Main Server?
View 1 RepliesI 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?
I am trying to create a simple chat server over vb that can relay messages back and forth using an echo server. Could someone point me in the correct direction to begin?
View 3 RepliesI am working on the client-server on my application and I am unsure which one of those method that I should use for the chat server. When I tried this:
Dim port As Int32 = 13000
Dim localAddr As IPAddress = IPAddress.Parse("127.0.0.1")
server = New TcpListener(localAddr, port)[code].....
I found that both of these methods are the same, I can connect to the server when I use either of them. tell me which one of them is the easy way and which one of them that I should use to connect to the server, send message...etc?
I'm trying to write my own SMTP server at the moment so that people can use it in their applications to send and receive emails.I am having a few problems at the moment with the TcpListener side of things though. Basically I do not want to start the TcpListener in the constructor of my class because people could be using this SMTP Server class just to send emails and might not care about receiving them. In fact the majority of people that use it will probably use it for that reason, to send and not to receive.
So I am now considering breaking this into 2 totally separate projects that have no dependencies on each other, but could easily be used in the same application if required. The reason I designed this with both 'features' in the same project in the first place was because that is how an SMTP server works - it can receive incoming SMTP requests and it can send SMTP server requests to other servers (and in some cases, receiving an SMTP request would cause it to send an SMTP command to another server)
I have been searching for days and months on youtube,google and everywhere else about how to create a Multi user chat system, where everybody can talk to each other all at once. Some people say Winsock is the way to go and others say TCP/IP is the way to go. I have little to no experience in either one of them. So if somebody can give me a really great turtioal or show me the guide lines on how to create a server and a client I would highly appreacite it. I am using Visual Basic 2008 express.
View 3 RepliesI am trying to write a program that has a server/listener program and then 2 client programs, the 2 client programs are supposed to be able to chat with each other. Can anyone point me in the right direction on this?
View 4 RepliesI made one client-server chat application using vb.net. I want to know how can i change the form/icon color when a client sends a message and vice versa.
for eg: like in yahoo messenger or msn messenger,etc, How i user knows when he receives an message.
I have been searching far and wide for knowledge regarding how to make a server program with a client program.Think like Msn ( Messenger ) You have the client and you send a message which is then send through the client to the server, and then to some other client (a friend might be ).I want to make a semilar program where ill make the server and the client myself, i just need a hint or two to get started.
View 1 RepliesI have been looking for a really detailed tut on how to use in a server to client chat room. I looked on google but they just post the script which helps alittle but I need a lot of detail to make a working chatroom.
View 2 RepliesIm am completely bored and wanted to make my own version of the palringo chat messenger (just to log into the palringo servers tho) and i have what i believe EVERY bit of the server info i need. [code]...
View 7 RepliesI want to create a CHAT server?
View 4 RepliesI've been attempting to create a Chat client/server for a while and I found some good tutorials for Visual Basic Express 2008. But I would like my client to be able to disconnect and have the server acknowledge the fact (and send the same message that it does when someone connects) that a client disconnected.
[Code]
I'm using sockets to connect to servers and for some strange reason I can't identify, the socket is taking several seconds (5 maybe 6) seconds to connect when using an IP whereas is instant when using a hostname. Here is my code to connect:[code...]
In the above code, server of course is a string. I've tested this with a friend and she's experiencing the same issue and I'd like to get around it as it's sort of annoying..While debugging GetHostEntry is the line that seems to take forever when using an IP.
i took this code from another example, it works fine but it a windows console application.i took the code into a windows form app but it looks like i have to change somethingto start, it says client is not defined, so what should i use?lient.startClient(clientSocket, Convert.ToString(counter))
Dim serverSocket As New TcpListener(8888)
Dim clientSocket As TcpClient
Dim counter As Integer
[code].....
transfer this from a Console app to a WinForms app? I'm still new to this and I want to build on top of this once I get more acquainted with VB.net. I don't know if this may be helpful, but I'm using Visual Studio 2008 (not express).
The Server Code I Found Online:
Imports System.Net.Sockets
Imports System.Text
Imports System.IO
Imports System.Net
[code].....