Archive for April, 2008

Creating a chat application using Socket in Silverlight

Posted on April 17, 2008. Filed under: C#, chat application, ruby, silverlight, socket, visual studio 2008 |

Here I will explain how to communicate with the server using the Socket class. The socket class allows Asynchronous communication between the client and server. This application will show how to share data in real-time in two different browser windows using Silverlight.

This application will contain two parts:

  1. Server application using Ruby.
  2. Client application using C# in Silverlight.
Creating the server application:

Making a multi-threaded server application in ruby is really easy and that is the reason I chose Ruby to create the server in least amount of time possible.

   1: require 'socket'
   3: HOST = 'localhost'
   4: PORT = 4505
   6: server =, PORT)
   8: # array to store all the active connections
   9: sessions = []
  10: while (session = server.accept)
  11:   # push the current session(socket) in the array
  12:   sessions << session
  13:   # initialize a new thead for each connection
  14: do |local_session|
  15:     # each time a client sends some data send it to all the connections
  16:     while(true)
  17:       data = local_session.gets
  18:       sessions.each do |s| 
  19:         begin
  20:           s.puts data
  21:         rescue Errno::ECONNRESET
  22:           # an exception is raised, that means the connection to the client is broken
  23:           sessions.delete(s)
  24:         end
  25:       end
  26:     end
  27:   end
  28: end


Here is the pastie.

Save this file as chat_server.rb


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Compiling and Installing GIT on windows under cygwin

Posted on April 11, 2008. Filed under: cygwin, FOSS, GIT, open source, perl, vista, windows |

Using GIT was one of the requirements of one of the project that I am doing. Here is how I installed GIT on Windows.

So What is GIT?

The supplied documentation of GIT says that:

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Here is the link for the wikipedia entry.

Where can I download GIT?

Here is the link.


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New and Improved Sudo for Vista (now remembers credentials)

Posted on April 2, 2008. Filed under: security, sudo, vista, vista, security, windows |

In one of my earlier blog post I shared source code for a simple utility that I had made. It could be used to launch elevated processes from the command line.

So opening a Elevated command prompt was as simple as writing

sudo cmd

Actually the code for this is very simple as it just executes a well documented system function ShellExecute.

I have made some changes to the script and now it remembers the credentials. So once you execute any command, Vista will ask you confirmation only once and any subsequent call won’t ask for the confirmation with the UAC dialog box.


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