I'm working on a simple socket client application that transfers files from one PC to another. The flow is as follows.
Client sends message to Server
Client Listens for response
Server responds with command
Client sends file or message to Server
Client Listens for response
This sequence will repeat thousands if not tens of thousands of times. It runs great on my dev box but when I load it on another machine I get a StackOverFlowException. I know why I'm getting the stack overflow. It's because I have a Listen subroutine that calls a Send routine. When the Send routine is done it calls the Listen routine again. The process works for about 614 iterations and then bombs out with a stack overflow. I guess my question is, how can I code a socket application that can send-->listen-->send-->listen thousands of times without blowing the stack?
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")
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 am using the client/server classes for file transfer by moeur.what i want to know is that once my client is connected to the server and after that the client machine goes off the network. now when my server trys to send a file or some message to the client i am not able to trap the error that the client is disconnected.how to do this. there might be a case where the client machine suddenly shuts down. in such cases how will my server know that the client has disconnected.
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?
I'm trying to build a multithreaded SMPP client with VS2008 and I'm getting bogged down in threading. Basically my main parent thread will interact with the windows service scheduler, get registry settings, and get a list of SMPP servers to connect to. Then it will launch a thread for each SMPP connection, which will need to keep it's TCP socket open to receive messages with, so the thread must remain running even if there aren't any events happening (no messages to receive)... but I can't seem to get it figured out.
[Code]...
The Start sub in the oChannel object does run, but once that sub is finished running the thread ends. In the Start sub, it calls other code that initiates a connection to the remote SMPP server, but that code asynchronously waits for an event to be raised regarding the connection status. Once the sub finishes, the async connection being attempted doesn't seem to be able to pin the thread down.
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
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?
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 am Working on Teghax Component.Using This Component we want to find out Block title attribute of dwg file in a client server socket application.
1> We get Block title attributes properly of dwg file in windows application form using the getattribute function().
2> We get Block title Attributes properly in that way:-We take a class library where we take a class.in this class we use getattribute function().Then We access the particular class from another project
But when we use the same class(Keep same structure) in client server socket program.Then it gives an exception.i.e ,"Spaicfied cast is not valid"I am Not getting any reply form teghax developer..I attached exception screen sort.Give me Suggestion How to solve this Exception
Code given Bellow :
Public Function Get_DwgFileAttribute(ByVal Sender As ClsTcpConnection, ByVal msgTag As Byte, ByVal message As String) As String Dictionary = GetHashtable(message) Dim varfilepath As String = CStr(Dictionary.Item("filePath"))
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:
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.
I 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 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.
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?
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
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.[code]
i'm developing a server application using vb.net and i'm facing a problem. in fact i have a huge data to send to the client via the socket so i use a loop to divide the data and send each part the problem is that when i proceed with the sending the socket send me only few peaces of the data and loose a big part of it. i tried to flush the buffer after each sending but i didn't find how to do it so i used a system.threading. thread sleep between each socket send. it works when i don't have huge data but it blocks my server when the number of packets increases. is there a solution that would replace the. sleep one without blocking the application?
I would like to make a multi-socket TCP server (to accept multiple clients at the same time).I'm working with Visual Studio 2005 Express, maybe that's why files on CodeBank don't work..I found on the web an example about MultiThreaded Server Socket programming, but this is done for "Console application" in this way:
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.
We are creating a Who wants to be a millionaire style game in VB. Our server is pulling information such as questions and answers from a Access Database and sending them to the contestants (Clients). All transfer of information is directly from the server to each client. One of the "Life Lines" we want to use is "Ask a friend", where one client is able to Instant message another client for a short time to get help on the question.
I am using Powerpacks from Microsoft. Especiallly the Printform routine. When i run it on my PC it runs fine, But when i install the development on the clients PC i get a error that says that the powerpack is not ibstalled? Do i need to add some reference? Will this be solved if i complie the solution with VB 2010 because i see the powerpacks is part of 2010? What if i install the poerpack on the clients PC?
installed in a another system. For some quite time, the client system is sync with my system. I have updated its database, i also updated the clients executable files. I have never tough any references in the system.My question is, an error occurs occasionally which is "Object reference not set to an instance of an object". This error does not occur in my development environment but is displayed on the client's PC
I have written a code for sending emails using my vb.net application,ok.Now i want to inform my client if and only if he is not connected to the internet before the sending emails.so it means the purpose of my code will be to check if he is online or nt and if not then inform him to get online and then try sending the email.How to do this?
I have google it but I couldn't find the answers. So basically I want to make a Client-Server chat. I just want to creating each server for the clients to entered the chat room with each different server, e.g: client 1 and client 2 entered chat server 1 (just a name of a room), client 3 and client 4 entered chat server 2 and so on. How I can do that?
