Dipin Krishna

iOS: NSNotificationCenter – broadcast information within a program

Dipin Krishna — Thu, 03 May 2012 21:39:39 +0000

An NSNotificationCenter object (or simply, notification center) provides a mechanism for broadcasting information within a program. An NSNotificationCenter object is essentially a notification dispatch table. Objects register with a notification center to receive notifications (NSNotification objects) using the addObserver:selector:name:object: or addObserverForName:object:queue:usingBlock: methods. Each invocation of this method specifies a set of notifications. Therefore, objects may [...]

iOS: Check whether internet connection is available

Dipin Krishna — Sat, 28 Apr 2012 14:59:50 +0000

Here, i am just checking whether network connectivity is available to a server and its done synchronously. You can use Reachability if you need notifications when there is any change in the network connectivity. For this you have to include the SystemConfiguration.framework in your project. Now add, #import "SystemConfiguration/SystemConfiguration.h" and the below function to your [...]

android.os.NetworkOnMainThreadException due to StrictMode.ThreadPolicy

Dipin Krishna — Thu, 19 Apr 2012 07:43:13 +0000

StrictMode.ThreadPolicy was introduced since API Level 9 and the default thread policy had been changed since API Level 11, which in short, does not allow network operation (include HttpClient and HttpUrlConnection) get executed on UI thread. if you do this, you get NetworkOnMainThreadException.

Remove ui.streamride.net ads injected by ISPs (Asianet in my case)

Dipin Krishna — Sat, 31 Mar 2012 09:04:17 +0000

Read it full here : Asianet(ISP) injecting javascript code(ads) in every webpage requested by the customer Here asianet(ISP) is injecting a javascript code into a website without the permission of the website owner and that’s against law. This is the piece of code they are inserting <br /> <div id="sTREAMrIDE" class="11;68"> </div> <p> <p> [...]

Asianet(ISP) injecting javascript code(ads) in every webpage requested by the customer

Dipin Krishna — Sat, 31 Mar 2012 05:07:17 +0000

Yesterday, while i was browsing the internet, i noticed that an ad is shown on the right side of each webpage i pull from the internet. What i am seeing is an ad that is generated by the javascript, but i am deeply concerned about the other activities it might be doing. [...]

iPhone(iOS) programming: A LOGIN screen which POST data to a url and parses the JSON response

Dipin Krishna — Sat, 24 Mar 2012 05:51:06 +0000

This tutorial will guide you to create a simple app with a Login screen which takes username and password from the user and then posts it to a url and parses the JSON response form the server.

Perl: Process an array or a hash inside a Template

Dipin Krishna — Sat, 17 Mar 2012 05:01:56 +0000

Process and array or a hash inside a perl template #Print an Array named items [% FOREACH item IN items -%] [% item %] [% END -%] #Print a HASH named items [% FOREACH key IN items.keys.sort -%] [% key %]: [% terms.$key %] [% END -%] Enjoy coding!

RubyOnRails: Create a Controller and Views for it using a single command

Dipin Krishna — Sat, 05 Feb 2011 20:14:15 +0000

Lets create a controller named ‘home‘ with views ‘index‘, ‘view2′ view3′. Fortunately, you can do that in a single command. Enter this command in your terminal: $ rails generate controller home index view2 view3 Rails will create several files for you, including app/views/home/index.html.erb. This is the template that will be used to display the results [...]

Magento: Check if an admin is logged in or not

Dipin Krishna — Mon, 17 Jan 2011 06:50:22 +0000

If you are writing a custom module, and you want it to be accessed only by admins, then you possibly need the following code in your controller. //get the admin session Mage::getSingleton('core/session', array('name'=>'adminhtml')); //verify if the user is logged in to the backend if(Mage::getSingleton('admin/session')->isLoggedIn()){ echo "Admin Logged in"; } else { echo "You need to [...]

Perl: Send a chat message to your gmail buddy using Jabber

Dipin Krishna — Thu, 23 Dec 2010 10:06:49 +0000

Net::Jabber provides a Perl user with access to the Jabber Instant Messaging protocol. Net::Jabber is a convenient tool to use for any perl script that would like to utilize the Jabber Instant Messaging protocol. While not a client in and of itself, it provides all of the necessary back-end functions to make a CGI client [...]

Perl: Send a message to a queue or topic using Stomp

Dipin Krishna — Tue, 21 Dec 2010 14:32:17 +0000

Net::Stomp module allows you to write a Stomp client. Stomp is the Streaming Text Orientated Messaging Protocol (or the Protocol Briefly Known as TTMP and Represented by the symbol :ttmp). It’s a simple and easy to implement protocol for working with Message Orientated Middleware from any language. Net::Stomp is useful for talking to Apache ActiveMQ, an open [...]

Perl: Function to print a HASH completely

Dipin Krishna — Wed, 15 Dec 2010 12:25:44 +0000

Below is a perl function that i wrote to print a HASH completely. What i mean by ‘completely’ is that it will expand all hashes and arrays found within the given HASH. sub print_hash { my ($hash,$str) = @_; while( my ($k, $v) = each %{$hash}) { print $str."$k => $v\n"; if( $v =~ /hash/i [...]

Perl: Send bulk mail via SMTP with authentication

Dipin Krishna — Wed, 15 Dec 2010 11:08:13 +0000

This is a tutorial on how to send mails to multiple recipients using Perl Net::SMTP module with authentication. The smtp module implements a client interface to the SMTP and ESMTP protocol, enabling a perl5 application to talk to SMTP servers. The first step is to create a SMTP connection to the server. A new Net::SMTP [...]

Perl: Simple way to read Command line arguments

Dipin Krishna — Tue, 14 Dec 2010 06:06:44 +0000

Parsing command-line arguments in Perl is very easy. All the command-line arguments are present in the array $ARGV. You can get the number of arguments passed as ( $#ARGV + 1 ). Below is a sample Perl script to read the command-line parameters. #!/usr/bin/perl #-------------------------------------------------# # File: argv.pl [...]

Sending Emails Via Gmail SMTP With Perl

Dipin Krishna — Wed, 08 Dec 2010 08:24:48 +0000

This is a tutorial on how to send mails using Perl Net::SMTP module through Gmail SMTP. The smtp module implements a client interface to the SMTP and ESMTP protocol, enabling a perl5 application to talk to SMTP servers. The first step is to create a SMTP connection to the server. A new Net::SMTP object must [...]