Month: April 2014

Abstract classes vs. interfaces

Usar interfaces cuando se esperan cambios frecuentes en el código. Interfaces es un método más flexible que herencia para manejar opciones de comportamiento. Una clase abstracta funciona de manera similar pero además permite definir comportamientos comunes, forzando a las subclases a definir los comportamientos especializados. Una clase abstracta se parece a una interface en que ambos son una especie de contrato de como se debe comportar la clase en el mundo exterior. Resumiendo; interfaces permite a una clase tener varios padres, pero una interface no implementa ningún método, solo especifica que métodos se deben implementar.

Una clase abstracta no se puede instanciar pero puede implementar algunos métodos ( o todos). Interfaces hacen oficial la separación entre implementación y la firma de una clase, mientras que una clase abstracta permite definir comportamiento común, pero por lo mismo es más fácil romper el código en cascada al hacer un cambio. La siguiente tabla compara interfaces y clases abstractas en C#

Interface Abstract class
Una clase puede heredar múltiples interfaces. Una clase solo puede heredar de una clase abstracta.
sin implementación por defecto. Implementación por defecto.
Solo Static final constants. Constantes pueden ser estáticas y de instancia.
La interface define las características periféricas de una clase. Una clase abstracta define el comportamiento interno de una clase.
Si las implementaciones solo se parecen en la firma, entonces es mejor usar interfaces. Si las varias implementaciones usan comportamientos comunes, es mejor usar una clase abstracta.
Ejecución Lenta. Ejecución rápida.
Es necesario revisar todas las implementaciones para  agregar funcionalidad. Se puede agregar el nuevo método a la clase abstracta y todas las implementaciones lo incorporan.

http://www.javaworld.com/javaworld/javaqa/2001-04/03-qa-0420-abstract.html?page=1
http://www.codeproject.com/csharp/abstractsvsinterfaces.asp
C# Interface Based Development

Quick Response Code

QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed for the automotive industry in Japan; a barcode is an optically machine-readable label that is attached to an item and that records information related to that item: The information encoded by a QR code may be made up of four standardized types (“modes”) of data (numeric, alphanumeric, byte / binary, Kanji) or, through supported extensions, virtually any type of data.[1]

The QR Code system has become popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes. Applications include product tracking, item identification, time tracking, document management, general marketing, and much more.[2]

A QR code consists of black modules (square dots) arranged in a square grid on a white background, which can be read by an imaging device (such as a camera) and processed using Reed-Solomon error correction until the image can be appropriately interpreted; data is then extracted from patterns present in both horizontal and vertical components of the image.[2]

PHP QR Code is open source (LGPL) library for generating QR Code, 2-dimensional barcode. Based on libqrencode C library, provides API for creating QR Code barcode images (PNG, JPEG thanks to GD2). Implemented purely in PHP, with no external dependencies (except GD2 if needed).

Some of library features includes:

  • Supports QR Code versions (size) 1-40
  • Numeric, Alphanumeric, 8-bit and Kanji encoding. (Kanji encoding was not fully tested, if you are japan-encoding enabled you can contribute by verifing it 🙂 )
  • Implemented purely in PHP, no external dependencies except GD2
  • Exports to PNG, JPEG images, also exports as bit-table
  • TCPDF 2-D barcode API integration
  • Easy to configure
  • Data cache for calculation speed-up
  • Provided merge tool helps deploy library as a one big dependency-less file, simple to “include and do not wory”
  • Debug data dump, error logging, time benchmarking
  • API documentation
  • Detailed examples
  • 100% Open Source, LGPL Licensed

MarkAny

MarkAny is a Korean rights management company, which has licensed Digimarc’s audio watermarking patents for combating music piracy. The most likely source is the software supplied with a Samsung MP3 player. Your PC will probably be running MAAgent.exe from C:Program FilesMarkAnyContentSafer (if it’s in a different folder, a file of the same name could be malware). You don’t need it.

It is almost certainly part of your samsung mobile phone driver package and intended to stop pirated music being downloaded by or played through the mobile phone.It came along with http://www.samsung.com/uk/support/mo…OFTWARE.MANUAL

it appears to be needed for you to use the samsung store and also does something when you conver videos to play on the mobile phone

You have 2 choices:
leave it alone or uninstall everything samsung related & don’t use of buy their products