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TcpClient

TcpClient

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by Espen Harlinn
A .NET Core client implemented in C# using TcpClient and a multi-threaded server implemented in C++
by Sicppy
A DLL resource to help beginner to intermediate developers open and use sockets in a P2P application.
by Nosey Parker
TcpClient.BeginConnect with timeout
by Craig Baird
A light weight easy to use .NET TCP server library

Latest Articles

by Espen Harlinn
A .NET Core client implemented in C# using TcpClient and a multi-threaded server implemented in C++
by MehreenTahir
This article will help you get started with socket programming in C++. We will build a TCP server and client using boost.asio library in C++.
by Nosey Parker
TcpClient.BeginConnect with timeout
by Sicppy
A DLL resource to help beginner to intermediate developers open and use sockets in a P2P application.

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TcpClient 

11 Jun 2015 by _Asif_
This[^] should give you a good start
17 Feb 2015 by Abhinav S
Links -Sending Files using TCP[^]Creating Simple TCP/IP Server And Client to Transfer Data Using C# / VB.net[^]Video - https://www.youtube.com/watch?v=ujYc6qPgn-8[^]
13 May 2015 by Afzaal Ahmad Zeeshan
A Windows Forms application would be good, but since you're going to allow multiple users to communicate through the same hub (server), ASP.NET would be better. If you do not want to use a website, with a layout and other formalities, ASP.NET Web API[^] would be best for this type of...
28 Dec 2013 by Albert Holguin
This sort of sounds like you may be accidentally using the same socket on different ports. Check to make sure each one has his own socket and they're not somehow using the same socket identifier. Also, make sure that your listening thread isn't terminating early for one reason or another.As...
9 Jun 2015 by AldoBlack
Hello,I have 6 devices, price checkers. I have a project which the client in a supermarket will scan a product on this device and it will return the price of the product. I have managed to connect with one device, get the bar code and send data. But I can not seem to do to connect with...
14 Aug 2014 by Aldrich Logan
actually i dont know how to explain my problem in english cause im not good at but ill tell what im making ... im making a internet cafe management system where in remotely control the clients send message and monitor their consumed time as well as locking their computer shutdown or restart i...
29 Jan 2013 by ali_heidari_
hi....i want to make a small app for connecting to a chat application and get some data! i want know is a generl way to connect with any server and get data or any server must provide some ways to let us connect to it! and if a server didnt do that we cant connect to it?i know how i can...
22 Mar 2013 by Amir Jalilifard
Hi there,I am confused to understand that is this application a Peer to Peer application?WCF TCP-based File Server[^]Is TCP a different concept than P2P?So what is different between net.tcp:// and net.p2p:// in addressing ?
23 Mar 2013 by Amir Jalilifard
So,What about Below application ? Is it a Peer to Peer App?WCF TCP-based File Server[^]
22 Jan 2013 by Andreas Gieriet
See the following two links for a server and a client example in C#:- Server[^]- Client[^]In the examples above, the character encoding is assumed to be ASCII (7-bit ASCII), thus, each buffer can be decoded immediately. If you transport any potentially multi-byte data, you must first...
18 Oct 2012 by Ashok26
I have a VB6 client and server written using WinSock and everything works fine.I am developing a .NET application(Visual Studio 2008).Can I use TCPclient as client to connect to server in WinSock?
7 Nov 2023 by bartello
I wrote a very simple chat server using boost::asio. Everything works as it should. As I just redid the TCPSession class to use "strand", there was an error in the functionality of the class: The server accepts a connection and immediately drops...
12 Aug 2018 by BatLine
I tried turning a console app into an windows form and everything went well until I wanted to make the received message (it's like a chat client) show in a textbox. Client Form: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using...
5 Nov 2012 by bEGI23
I am a bit confused now. I am creating a TCP Chat App (Client-Server) and my questions is im behind a router, im the server. DDo i also have to port-forward the TCP Port to my local computer, like the Client has to do or do i have not because im the server and the server basically waits in...
6 Nov 2012 by bEGI23
I already know how to obtain my IP programmatically but i found out that only the server needs port-forwarding, the client does not have to port-forward since he searches for connection, thanks ExcellentProducts for the tips
25 Oct 2012 by Bello Ibraheem
Am having trouble sending information to a server when the client and server are on different system. but when the Client and Server are on one system everything works perfectly ok.i Get this Exception every time and i have turn off windows firewallEndPointNotFoundExceptionCould not...
22 Aug 2015 by blitzkrieg89
I have created a chat application using TcpClient and TcpListener in Visual Studio.All works fine when I run the server on my computer.I want to host the server application online on the Internet, like GoDaddy.com, so that it can be accessed from anywhere.Is this possible? If not, any...
10 Oct 2012 by Brian C Hart
I am working with VS2008 and .NET 3.5. the server and client are both on Win7.I have a server and a client who are using the STX/ETX protocol. The server opens a TcpListener on port xxxx and what the basic thing is that the server waits for connection to come in on that port, and once a...
24 Mar 2014 by Brian Honde
I managed to create a TCP Server but I want to know how to send an acknowledgement to the client. I am communicating with an HL7 system using a specified port number.
5 Nov 2012 by CafedeJamaica
You can set up a TCPListener depending, if you google the class there is a very straght forwad example.http://msdn.microsoft.com/en-us/library/system.net.sockets.tcplistener.aspx[^]make sure that you select the right version of .net for your client implmentation for the example.
16 Oct 2013 by chester_it21
dear all master,corresponding tag title line above me ,explanation of cases like this :There is a TCP / IP socket server that is already running ...later application TCP / IP would I make must be connected to a TCP / IP Socket Server that is running the ...and his process is ,...
19 Dec 2013 by CHill60
Without seeing the actual code it's quite difficult to assist. However will this article help Multi-threaded Client/Server Socket Class[^]?
4 Nov 2022 by Chris Copeland
In addition to RickZeeland's comment, another important thing to remember when it comes to network/streaming is that there's no guarantee how many bytes you'll receive at any given time. byte[] bytes = new byte[1000000]; ...
28 Sep 2015 by CPallini
Did't you google for[^], did you?
8 Apr 2013 by Craig Baird
A light weight easy to use .NET TCP server library
11 Jun 2015 by dabuskol
Hi,Below the code that I've got from the net to communicate to unix from .net (c#)unfortunately, the code works can connect but return a garbage result.it also displays that I can connect with the ip/port.The objective is to connect to unix with userid/pass and execute a command...
25 Oct 2012 by Dave Kreskowiak
Your firewall is blocking port 8080. You have to "punch a hole" in it to allow inbound connections on that port.
30 Jan 2013 by Dave Kreskowiak
You wouldn't normally do this. At install time, you'd ask the person installing the app for the name of the SQL Server and instance, port number, and credentials to use, giving them the option of using Windows Authentication. You'd then construct the connection string from that information and...
18 Mar 2015 by Dave Kreskowiak
No, this is not how it's done.Think about it. How is the server going to know that there are clients to connect to? How is the server going to find them??It's not.
26 Sep 2022 by Death Smoke
I'm trying to make a connection between two computers both of them are using tp-link adapter , but i'm not receving anything from client . #include #include using namespace std; int main() { ...
3 Dec 2012 by Deenuji
i wanna send one file through ip address i got error like this No connection could be made because the target machine actively refused it 192.168.1.20:80Below coding i written in this program....this is program error or it's related to firewall proble....but in my system i disable the...
23 Apr 2019 by DoingWork
How to detect closed TCP connection when Client disconnected disgracfully i.e sudden power off ? Following method don't work when client disconnects disgracefully. What I have tried: if (socket != null) { bool part1 = socket.Poll(1000,...
16 Nov 2018 by Dominick Marciano
I am trying to connect to mail servers (using a TcpClient) in order to test if an email address is valid without sending an actual email (this is for a client). I am currently using GMail for testing and I am able to successfully connect to the SMTP server. However, when I try to perform a...
18 Dec 2012 by Dominique Krug
HelloI provided a C# application, which to log messages over a TCP/IP connection to a CONSOLE (a TXT file would also go) to transfer and indicate is. Unfortunately this does not function and I didn't know which changes is necessarily thereby the messages over the TCP/IP connection can be...
18 Mar 2015 by E.F. Nijboer
The client has to setup the connection because most clients are behind a router (NAT.) It prevents incoming connections to the client from anyone outside of the NAT. Meaning servers are reachable over the internet and clients are (mostly) not. But polling every x minutes should't be that bad....
23 Mar 2021 by Espen Harlinn
A .NET Core client implemented in C# using TcpClient and a multi-threaded server implemented in C++
6 Nov 2012 by ExcelledProducts
You may need to. If you are using a local IP address of 127.0.0.1 then no any router connected to your network will be able to connect but if you are using a private ip address such as 192.168.1.678 then nobody will be able to connect. You need to find your public IP address....
22 Aug 2015 by F-ES Sitecore
You'll need to hire a shared server with a fixed IP address (a lot of web hosts will offer these). You need a domain registered such that it points to your server (say chat.yourdomain.com), your app needs to run on this machine listening to its given port, and your chat client needs to connect...
6 Oct 2016 by F-ES Sitecore
Host it on what server? On the internet? If so hire a virtual server with (ideally) a fixed IP. You should implement your code as a Windows Service and install the service on your server.
19 Apr 2018 by F-ES Sitecore
Would you want services accessing your USB devices? Of course this isn't possible.
26 Oct 2012 by fam891
Hi all. It turns out that the code was executing properly, and the issue was how the ConnThread was trying to start Timer1 (a timer on my main form). Apparently, a windows.forms.form.timer cannot be accessed by another thread, and VB.NET will not throw an exception when compiling or...
29 Aug 2013 by Garth J Lancaster
Its a bit hard given you havnt told us a whole lot here - for example, do you also have to supply the program/code for the recipient (on the other end of the phone line), or, are you only the client ?If you are only a sender/client, then what file/transfer protocol does the receiver/server...
30 Aug 2013 by Garth J Lancaster
I havnt yet found an open source kermit/xmodem/... protocol implementation - there are commercial ones, some even with C# Classes rather than having to use P/Invoke ..this is an interesting site I found that may have enough get you started on basic c# serial comms...
8 May 2016 by Garth J Lancaster
I hate the way you havnt commented your code, and you've jumbled up your input and output scanners & streams etc of your code for your client and server - makes it real hard to follow !Are you in effect asking about this code p.println("test.txt"); p.flush(); ...
1 Aug 2014 by Gautham Prabhu K
Yes, Its possible.Performance depends on many factors, if you can be a little more specific on points given below I can help you out.1. What machine your running and what technology your using to develop the application.2. How many servers you want to connect in any given point of...
7 Sep 2022 by Gcobani Mkontwana
I a new to WPF but so far managed to create a status bar, but i want to create a grid with columns. I want to create this logic to it; // Requirement that must implement. 0 I need some help, I have status bar but want to implement following...
14 Jul 2014 by George Jonsson
Microsoft has some pretty good examples for sockets, both synchronous and asynchronous.It is a good start for you I think.Socket Code Examples[^]When it comes to your wish to make the server send a command and the client to wait, what you basically want is to let the client become the...
25 Oct 2015 by George Jonsson
Try using NetworkStream[^] instead of StreamReader and StreamWriterHave a look at this example.TcpClient.GetStream Method[^]
9 Jun 2014 by gggustafson
Remember, the server has no idea how much data is being sent. And, if the client disconnects after sending the last message but before the server has read the last message, the connection will be lost and it will appear that you have lost data. Here's a thought on what you can...
26 Mar 2013 by giri001
Hi ALL,i write a TCP client which able to communicate with Server but each time i am getting different-different string .RT832RTRT8RT832R but on hyperterminal i am always getting proper string like RT832RT832RT832RT832below my code: private static void...
6 Sep 2017 by Graeme_Grant
There are plenty of articles right here on Code Project that cover this topic: TCP - CodeProject search[^] - Pick one.
5 Apr 2021 by Greg Utas
If you want to look at some C++ code for a thread that handles TCP, on either the server or client side, here[^] is an example. Start in the Enter function on line 332. This has been tested under load on Windows. The comments in its header[^]...
12 Nov 2023 by headshot9x
I have a WinForms application C#. In here, I used TcpClient/Socket and NetworkStream. I have created multiple thread to handle sending/receiving from client/server. Assuming I'm forced to use TcpClient/Socket, I won't use other libraries or...
24 Oct 2017 by Hendrik Vis
I'm trying to connect to a server coded using C++ and an openssl wrapper. I'm using C#. The server has provided me with: 1. A certificate (.crt - header of "-----BEGIN TRUSTED CERTIFICATE-----") 2. A private, encrypted key (.key - header of "-----BEGIN ENCRYPTED PRIVATE KEY-----"). This key is...
14 Apr 2017 by Hitmanlima
I send the image to the server, I noticed that it is receiving the image in several packages, I tried to join the buffers, but it is not working, if I put the image in the picturebox without joining the buffers the image is incomplete My project consists of several clients and a server that...
14 Apr 2017 by Hitmanlima
My solution is: Sending Img Dim netStream As NetworkStream Dim Formatter As IFormatter = New BinaryFormatter() Formatter.Serialize(netStream, img) Receive Img Dim netStream As NetworkStream Dim Formatter As IFormatter = New BinaryFormatter() Dim img As Image =...
18 Jan 2019 by HobbyProggy
Hi there, to enhance my current Software i wanted to switch the datalogic to a server application that has faster connection to the database and is able to cache data. So far i wrote a working server app and a client that connects to this server. Currently i am experiencing a performance issue...
18 Mar 2018 by honeyashu
In my C# code I am receiving a byte[1024] from a DLL through TCP link. Code I did for this I am attaching below. The workflow is An asynchronous packet gets received at tcp port into a byte array, which then gets copied to a different array for processing. This copied array then gets...
21 Dec 2021 by Hu Christian
Hi, I'm using Net.Sockets TCPClient to record data from a instrument. Because I need to continuously listen the output data from the instrument, then according to the data to communicate with some commands, I run the program with a thread(named...
10 Jun 2015 by jdeep84
I would suggest to write down one broker service/ message queue which will collect product scan results from the devices in async manner and then fetch it to the price service to return appropriate price of product.
19 Dec 2012 by Jibesh
Read about .Net Remoting herea-simple-remoting-example-in-c/[^]dotnetremoting[^]
27 Oct 2014 by Jochen Arndt
Just pass the file descriptor, arr and size to the write function. The type of the buffer pointer does not care as far as the count parameter specifies a valid number of bytes contained in the buffer. See also man 2 write[^].The write function just transfers data. It does not care what kind...
25 Jul 2018 by Jochen Arndt
The problem is that the process who owned the socket (your tcplistener application) did not perform a proper shutdown of the related connections and / or sockets. In such cases, the port is blocked for some time - or even until reboot - before it can be reused. To avoid this, you have to...
19 Oct 2016 by johannesnestler
Have a look on MSDN and inspect this sample to see a way how you could do it (it reads till but just replace with your special character(s)https://msdn.microsoft.com/de-de/library/fx6588te(v=vs.110).aspx
29 Apr 2013 by Kasn nimith
Do routers block TCP clients ? , Is skype not using a TCP client socket ? Does skype use a TCP client ? ,IF skype not use tcp client, then how Skype connect to each other ? When TCP Listener is available on internet, Does TCP clients get blocked when try to connect to TCP Socket server...
16 Oct 2018 by Kornfeld Eliyahu Peter
TcpListener.AcceptTcpClient is a blocking method. It will not return until a connection made... In your case it means that no connection on that address and port... As you state that some test software does recognize the device, you probably have the wrong settings (IP/port)...
11 Apr 2014 by laxman ghadage
hi, I have written for connectivity using tcpclient.but after every successful transaction it creates new session for each request.please do help..thanks in advance.my code is as..namespace CBS{ class TCPListner { private static string hostName = ""; ...
23 Mar 2013 by Leo Chapiro
No, it is not a P2P application. If you are looking for a such one, take a look: A simple peer to peer chat application using WCF netPeerTcpBinding[^]This application is merely a TCP-based file server, it has no features to connect different clients like a P2P server would do.
4 Aug 2019 by Leonid Kazakov
I create a list of connections using TcpConnectionInformation, after it I find in that list the address which used in my program by the external IP RemoteEndPoint. Which command used to close the found connection? This task is similar to the Russinovich TCPView program. private void...
4 Aug 2019 by Leonid Kazakov
First of all visit CurrPorts: Monitoring TCP/IP network connections on Windows and download programm CurrPorts. It seems that C # cannot solve the problem of closing the port. We will use the utility: private void ClearConnection() { string programma = Directory.GetCurrentDirectory() +...
18 Jan 2023 by Les Wilkinson
Hello, I'm using an rpi pico-w as a tcp client in a logging project (written in 'C'). By copying the examples, the code is running. After successfully communicating a number of times the "tcp_client_open" function fails when "tcp_new_ip_open"...
16 Mar 2024 by Line Item
I would try running this from a command line, with some adjustments for that to make it a simple command. Get that to work then add to that a little at a time. Maybe then try moving that to PowerShell. Get that to work then add more until you...
5 Nov 2012 by m.bleimuth
Hi,i am trying to write some kind of a simple information System. My Server is written in c#, it sends every minutes udp heartbeats with Server Information (ip, port of the Server). Now i want to write a simple Website with html and JavaScript that connects to my Server and receives data...
5 May 2017 by m88120
I want to connect the Tcp client application to multiple socket listener.Is it is possible to make this type of connection if yes, please explain what can do to perform this.My scenario is:I have number of Socket listener and one TCP client, I want Tcp client make connection to all the...
7 Sep 2022 by Maciej Los
Start here: How to: Create a Grid Element - WPF .NET Framework | Microsoft Docs[^]
27 Jul 2021 by Magic Wonder
Dear All, Here I have a client whose code is as below. This code is connects to server and runs perfectly when server is up. Issue is if server is down then it gives System.StackOverFlowException after 100 loops. However, if server is up and...
21 Jun 2015 by Mahmoud_Gamal
i need help to send unsigned character over tcp in unix but it case error in this linevoid Write(char * a,int size){ unsigned char dt []=a;// erorr write(Socket,a,2); // error }
27 Oct 2014 by Mahmoud_Gamal
i solve it temporary like this void WriteU(unsigned char buff[], int size){ int h ; h = write( m_Client->Socket,buff,size);// printf("\n data write \n %i",h);}why i tired my self if there is another way
18 Mar 2015 by manchanx
I don't think this makes a lot of sense. However, if you really want to do that, you can just keep the client trying to connect in a loop.
29 Jan 2013 by Marco Bertschi
This tutorial[^] helped me.
14 Jul 2014 by Matt Harber
Gday Guys/Girls,I am trying to create a TCP server and clients. I want the server to be able to handle multiple active clients 24/7 (approx 10-15 clients, possibly more). The server will send a string to the client and the client runs a command based on the string sent. I have a basic TCP...
15 Jul 2014 by Matthew Dennis
// assuming you have created a CancellationToken so you can cancel the Telnet Monitors.List telnetTasks = new List();for (var i = 0; i
22 Oct 2018 by MehreenTahir
This article will help you get started with socket programming in C++. We will build a TCP server and client using boost.asio library in C++.
16 Jan 2018 by Member 10296419
Hi i have client and server and work fine.Server send file to client and client receive it good,But when i try again to resend another file server and client they lose communication.Please Help me?thks Server Code: Private Sub Button1_Click(sender As Object, e As EventArgs) Handles...
11 Dec 2013 by Member 10440446
Hi guys, any idea on how am I suppose to create an application on C# 5.0 using async await Telnet client.My scenario is that I have to telnet multiple servers at the same time. Also, i need it to check the servers continuously just like a ping /t function.Thanks much.. :)
19 Dec 2013 by Member 10478484
I'm writing an application that has to make a connection on a socket to a set IP and port. During the lifetime of this socket connection, I'm required to listen on a specific port and respond when a message is received on the same port.The application is part of a complex multi threaded...
7 Jul 2016 by Member 10710536
I would like to write a programm to communicate with a modbus TCP/IP slave.I found some library's but they are all for .net.I would like to use windows UWP. So i believe i have to have a library for the .NETcore.Can someone help me with thisWhat I have tried:I already tried...
15 May 2014 by Member 10821675
So I'm working on a TCP client-server blackjack game and I'm having a bit of trouble understanding how threads work here:import java.net.*;import java.util.*;import java.io.*; public class Game{ public final int MAX_NUM_PLAYERS = 2; public ArrayList...
27 Jan 2015 by Member 11406566
Hi guys,I work for a company that provide service to track vehicles with gps devices, rigth now I need to find a way to send commands to an enfora devices over the air using the tcp protocol, I have tried many ways with no results unfortunately. I just can send commands via sms.I would...
8 Dec 2015 by Member 11543226
I have form 2 class to handle connected clients, and i have datagridview in that i added one button column and now i have to do is what , send data to connected client without clients request, the data which need to send to client is in another method other than dgv event. public class...
19 Oct 2016 by Member 11543226
I have written a code to receive data from networkstream and if data contains first character "$" then i identify this data as barcodes data, but sometimes when data is large like 7000byte at that time data coming in packets of different sizes but some bytes not detected as they miss "$" symbol...
13 May 2015 by Member 11687571
Good day dear programmers , hopefully soon I become a colleague :) . I am just new to programming , but still I have had some experience with programming in Access VB and a a small overview over VB.Net . But let's get to the question . I want to build a nice app with a Server side and...
2 Jun 2015 by Member 11723960
I need make a chat where i achieve connect a tcp client C# with client html, but there are not a lot of information about what i want to do, if someone already did something like this, i'd appreciate your help. Basically I'm trying make a windows form application to send text to client html on...
4 Jun 2015 by Member 11742086
Hi, did you solve your problem? I’m able to send commands via TCP with no problems but it seems like the device is ignoring them. How is the package format you’re using? Could you provide an example byte per byte of a valid AT command sent over TCP?I could give you the the Java class I’m...
6 Oct 2016 by Member 12682888
I am working on vehicle Tracking System. I did TCP listner server. I want to host this on server. how do i achieve it? or other than winform their is any way in .Net ThanksWhat I have tried:I am working on vehicle Tracking System. I did TCP listner server. I want to host this on...
6 Oct 2016 by Member 12682888
thank for quick reply.I implement code in Windows Service. when i start service port goes open its OK, while after client connect its work, but when client send data to server automatically service stop.i dont know exact reason please help me
30 Jun 2020 by Member 12885549
I am creating an app which has to wait for TCP messages and when there's one - create text file with that message data. For that I created .NET core console application. However I stumbled upon problem that after writing message/getting exception...
31 Jul 2017 by Member 13337752
I've made a client/Server app using TCP sockets, but clients stuck too often and they throw "Connection timed out" while reading for new messages from the Server. On both apps im using this: try{ do{ message=(String) input.readLine(); ...
12 Jan 2018 by Member 13479861
Hi, I am testing a Tcp client C# windows form application I am able to send data to Tcp server Software(Hercules 3.2.8) But when i sent data from Tcp server to windows form then i am getting the following error: System.InvalidOperationException: Cross-Thread operation not valid: Control...
19 Apr 2018 by Member 13695363
I would like to communicate with a USB device attached to a client system via Internet, I have to connect to the port the device is connected to on the client side, and then invoke the execution of a function on my side, So in a scence I need to communicate with that USB device without having...