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• In C#, how to check if a TCP port is available?

  - by Ali

  In C# to use a TcpClient or generally to connect to a socket how can I first check if a certain port is free on my machine? more info: This is the code I use: TcpClient c; //I want to check here if port is free. c = new TcpClient(ip, port);

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• Event Listner in php

  - by isurulucky

  Hi, I want my web server to notify me through a php page when an event occurs at a another TCP server, to which the php page has successfully connected via a socket. The event is like the TCP server want to send a message to the web server, etc. Is there any way to accomplish this and/or any references on how to do it??? Thank You!!

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• server push or client push is better ?

  - by akshay

  I am developing a chat website using jsp/servlet.I will be hosting my website on gooogle appengine .Now i have some doubts regarding whether to use server push or client pull technology 1)If i use server push and if i dont close the response of servlet will it cause the server to go slow?How many simultanious connection can a tyicall tomcat server can handle if i keep the socket open for the entire chat session between 2 clinets?? 2)Will server push or clinet push be better??

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• How can I display a Perl/Tk window in the bottom righthand corner?

  - by pavun_cool

  I have planned to do the chatting the exercise Perl socket. In this I want to display the require window using Perl/Tk. Here my requirement is that the window has to display in the bottom right corner. It is like Gmail Chat window. What do I need to achieve this? By default it displays in top left corner.

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• Clojure best way to achieve multiple threads?

  - by user286702

  Hello! I am working on a MUD client written in Clojure. Right now, I need two different threads. One which receives input from the user and sends it out to the MUD (via a simple Socket), and one that reads and displays output from the MUD, to the user. Should I just use Java Threads, or is there some Clojure-specific feature I should be turning to?

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• .NET Application broken on one PC, unhandleable exception

  - by Bobby

  Hello people. I have a .NET 2.0 application with nothing fancy in it. It worked until yesterday on every PC I installed or copied it to, no matter if 2.0, 3.0, 3.5 or 3.5 SP1 was installed, no matter if it was Win2000, XP or even Win7 (in total 100+ machines). Yesterday I did my normal installation procedure and wanted to start it one time to check if everything is working...and it wasn't. The program crashed hard leaving me with the uninformative "Do you wanna report this error?" dialog. The problem is an exception in the Main(String[] args) routine of my application. The event viewer is showing the following entry: Event Type: ErrorEvent Source: .NET Runtime 2.0 Error Reporting Event Category: None Event ID: 5000 Date: 05/05/2010 Time: 16:09:09 User: N/A Computer: myClientPC Description: EventType clr20r3, P1 apomenu.exe, P2 1.4.90.53, P3 4bdedea4, P4 system.configuration, P5 2.0.0.0, P6 4889de74, P7 1a6, P8 136, P9 ioibmurhynrxkw0zxkyrvfn0boyyufow, P10 NIL. Well...great information. After a lot of searching I finally was able to get further information about this exception (by adding a handler for UnhandledExceptions directly in My.MyApplication.New(), Application.Designer.vb): System.Configuration.ConfigurationErrorsException Configuration system failed to initialize at System.Configuration.ClientConfigurationSystem.EnsureInit(String configKey) at System.Configuration.ClientConfigurationSystem.PrepareClientConfigSystem(String sectionName) at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName) at System.Configuration.ConfigurationManager.GetSection(String sectionName) at System.Configuration.PrivilegedConfigurationManager.GetSection(String sectionName) at System.Net.Configuration.SettingsSectionInternal.get_Section() at System.Net.Sockets.Socket.InitializeSockets() at System.Net.Sockets.Socket.get_SupportsIPv4() at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.get_HostName() at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.RegisterChannel(Boolean SecureChannel) at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine) at MyAppNameHere.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:Line 81. And at this point I'm stuck...I'm out of ideas. I'm not using any kind of configuration system from the framework (no reference to System.Configuration, and there never was a MyAppnameHere.exe.config generated or distributed, nor have I seen this error before). I also found a bug report at Microsoft (Google Cache) about this bug (in another context, though). But as it seems, they won't even look at it. Every help is greatly appreciated! Edit: I'm using Visual Studio 2008 Prof.. Crash happens in Release- and Debug-Build on the client machine. Debugging the application directly on this machine is out of question I fear, 300+ Miles and they only have two computers to work with.

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• PHP REST Clients

  - by Jamie Rumbelow

  I'm trying to connect to a RESTful web service, but I'm having some troubles, especially when sending data over PUT and DELETE. With cURL, PUT requires a file to send, and DELETE is just weird. I'm perfectly capable of writing a client using PHP's socket support and writing the HTTP headers myself, but I wanted to know whether you guys have ever used or seen a REST client for PHP?

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• HTTP basic authentication using sockets in python

  - by user352958

  How to connect to a server using basic http auth thru sockets in python .I don't want to use urllib/urllib2 etc as my program does some low level socket I/O operations

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• Postergres could not connect to server

  - by Gary Lai

  After I did brew update and brew upgrade, my postgres got some problem. I tried to uninstall postgres and install again, but it didn't work as well. This is the error message.(I also got this error message when I try to do rake db:migrate) $ psql psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"? How can I solve it? Mac version: Mountain lion. homebrew version: 0.9.3 postgres version: psql (PostgreSQL) 9.2.1 And this is what I did. 12:30 ~/D/works$ brew uninstall postgresql Uninstalling /usr/local/Cellar/postgresql/9.2.1... 12:31 ~/D/works$ brew uninstall postgresql Uninstalling /usr/local/Cellar/postgresql/9.1.4... 12:31 ~/D/works$ psql --version bash: /usr/local/bin/psql: No such file or directory 12:33 ~/D/works$ brew install postgresql ==> Downloading http://ftp.postgresql.org/pub/source/v9.2.1/postgresql-9.2.1.tar.bz2 Already downloaded: /Library/Caches/Homebrew/postgresql-9.2.1.tar.bz2 ...... ...... ==> Summary /usr/local/Cellar/postgresql/9.2.1: 2814 files, 38M, built in 2.7 minutes 12:37 ~/D/works$ initdb /usr/local/var/postgres -E utf8 The files belonging to this database system will be owned by user "laigary". This user must also own the server process. The database cluster will be initialized with locale "en_US.UTF-8". The default text search configuration will be set to "english". initdb: directory "/usr/local/var/postgres" exists but is not empty If you want to create a new database system, either remove or empty the directory "/usr/local/var/postgres" or run initdb with an argument other than "/usr/local/var/postgres". 12:39 ~/D/works$ mkdir -p ~/Library/LaunchAgents 12:39 ~/D/works$ cp /usr/local/Cellar/postgresql/9.2.1/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/ 12:39 ~/D/works$ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist homebrew.mxcl.postgresql: Already loaded 12:39 ~/D/works$ pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start server starting 12:39 ~/D/works$ env ARCHFLAGS="-arch x86_64" gem install pg Building native extensions. This could take a while... Successfully installed pg-0.14.1 1 gem installed 12:42 ~/D/works$ psql --version psql (PostgreSQL) 9.2.1 12:42 ~/D/works$ psql psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

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• multiple Thrift services on one transport

  - by kert

  Just seeking confirmation here : apache Thrift protocol does not seem to support running multiple services on one transport endpoint ? ( a socket, file, whatever ) I cant seem to figure out how to do something like this in Thrift: service otherService { void dosomething() } service rootService { otherService getOtherService() } There does not seem to be any concept of passing in and out service handles, ultimately limited by the protocol. Looks like you can not run two services on one transport pipe. Correct ?

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• django web server chat

  - by imran-glt

  Hi can any body suggest me an idea about how can i create a chat interface between the friend list which i have created for my application. actually a want to create a chat server. i have a friends list in my django model. if more then one person is online at the same time then they chat with one another. for this purpose do i have to create a socket or is there any other way to do it. Thanks

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• Azure and native code

  - by bertelmonster2k

  It looks like you can host native code on Azure: http://msdn.microsoft.com/en-us/library/dd573362.aspx. Is it possible to run a socket server (listening tcp/udp) here? And even hosting a CLR on top?

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• How to send a HTTP "Bad Request" Response

  - by michael

  Hi, I am writing a C program which needs to send back a HTTP Bad Response. This is what I write to socket. HTTP/1.1 400 Bad Request\r\n Connection: close\r\n \r\n My question is why the broswer still spinning (like appear it is still loading something? Am I missing header in the Http response? OR I miss something else? Thank you.

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• printStackTrace in java?

  - by Venkats

  I am go through a socket program. In that printStackTrace is caught by the catch block. Actully what it is? catch(IOException ioe) { ioe.printStackTrace(); } I am unaware of it. For what they are used?

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• What is a cross platform way of reading sysctl information?

  - by Crazy Chenz

  What is a cross platform / portable way of reading sysctl information? I want to know things like max open files, max open files per process, socket buffer sizes, max threads, max threads per process, etc.

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• C# : How Can I tranfer data through internet from client to server ?

  - by Harun

  Hello, I am developing a server client application . Where Client will send a huge amount of data to server through internet. However I have done some asynchronous socket programing before. Can I use same code here ? Thanks.

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• How to Profile R Code that Includes SNOW Cluster

  - by James

  Hi, I have a nested loop that I'm using foreach, DoSNOW, and a SNOW socket cluster to solve for. How should I go about profiling the code to make sure I'm not doing something grossly inefficient. Also is there anyway to measure the data flows going between the master and nodes in a Snow cluster? Thanks, James

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• Running Network Application on port Server side give me error how can i solve it?

  - by Phsika

  if i run Server App. Exception occurs: on Dinle.Start() System.Net.SocketException - Only one usage of each socket address (protocol/network address/port) is normally permitted How can i solve this error? Server.cs using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO; using System.Net; using System.Net.Sockets; using System.Threading; namespace Server { public partial class Server : Form { Thread kanal; public Server() { InitializeComponent(); try { kanal = new Thread(new ThreadStart(Dinle)); kanal.Start(); kanal.Priority = ThreadPriority.Normal; this.Text = "Kanla Çalisti"; } catch (Exception ex) { this.Text = "kanal çalismadi"; MessageBox.Show("hata:" + ex.ToString()); kanal.Abort(); throw; } } private void Server_Load(object sender, EventArgs e) { Dinle(); } private void btn_Listen_Click(object sender, EventArgs e) { Dinle(); } void Dinle() { // IPAddress localAddr = IPAddress.Parse("localhost"); // TcpListener server = new TcpListener(port); // server = new TcpListener(localAddr, port); //TcpListener Dinle = new TcpListener(localAddr,51124); TcpListener Dinle = new TcpListener(51124); try { while (true) { Dinle.Start(); Exception is occured. Socket Baglanti = Dinle.AcceptSocket(); if (!Baglanti.Connected) { MessageBox.Show("Baglanti Yok"); } else { TcpClient tcpClient = Dinle.AcceptTcpClient(); if (tcpClient.ReceiveBufferSize 0) { byte[] Dizi = new byte[250000]; Baglanti.Receive(Dizi, Dizi.Length, 0); string Yol; saveFileDialog1.Title = "Dosyayi kaydet"; saveFileDialog1.ShowDialog(); Yol = saveFileDialog1.FileName; FileStream Dosya = new FileStream(Yol, FileMode.Create); Dosya.Write(Dizi, 0, Dizi.Length - 20); Dosya.Close(); listBox1.Items.Add("dosya indirildi"); listBox1.Items.Add("Dosya Boyutu=" + Dizi.Length.ToString()); listBox1.Items.Add("Indirilme Tarihi=" + DateTime.Now); listBox1.Items.Add("--------------------------------"); } } } } catch (Exception ex) { MessageBox.Show("hata:" + ex.ToString()); } } } }

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• Know if the client has terminated while using sockets in C..

  - by shadyabhi

  Suppose, I have a connected socket after writing this code.. if ((sd = accept(socket_d, (struct sockaddr *)&client_addr, &alen)) < 0) { perror("accept failed\n"); exit(1); } How can I know at the server side that client has exited.

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• 3d engine with telnet access

  - by zaf

  Does anyone know of a open source 3d engine which can be operated via telnet? What I'm looking for is scripting via a socket connection. To allow for world creation and/or camera movement. Does anybody know of any that has this built in or very, very easy to add as a plugin or script? The platform is not crucial.

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• Sending Large Data > 1 MB through Windows Sockets viz using the Send function

  - by user66854

  Hi all, I am looking to send a large message 1 MB through the windows sockets send api . Is there a efficient way to do this , i do not want to loop and then send the data in chunks . I have read somewhere that you can increase the socket buffer size and that could help . Could anyone please elobrate on this . Any help is appreciated

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• Is 'epoll' the essential reason that Tornadoweb(or Nginx) is so fast?

  - by Mickey Shine

  Tornadoweb and Nginx are popular web servers for the moment and many benchmarkings show that they have a better performance than Apache under certain circumstances. So my question is: Is 'epoll' the most essential reason that make them so fast? And what can I learn from that if I want to write a good socket server?

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• Are there any protocols/standards on top of TCP optimized for high throughput and low latency?

  - by Nosrama

  Are there any protocols/standards that work over TCP that are optimized for high throughput and low latency? The only one I can think of is FAST. At the moment I have devised just a simple text-based protocol delimited by special characters. I'd like to adopt a protocol which is designed for fast transfer and supports perhaps compression and minification of the data that travels over the TCP socket.

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• implementing proxy support in C, is there any library for that?

  - by Sabya

  Hi, I want to implement proxy support in my application. There are two parts that needs to be implemented: Detection of proxy details (protocol, host, port): I am using libproxy for that. Connecting to the the proxy server and telling it to relay the packets. Get the connected socket and then use it in your application. Is there library for the #2 part?

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• How to simulate a dial-up connection for testing purposes?

  - by mawg

  I have to code a server app where clients open a TCP/IP socket, send some data and close the connection. The data packets are small < 100 bytes, however there is talk of having them batch their transactions and send multiple packets. How can I best simulate a dial-up ut connection (using Delphy & Indy components, just FYI)? Is it as simple as open connection wait a while (what is the definition of "a while"?) close connection

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