lucamauri.com :: SnipNETs

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SnipNETs
My personal Snippets

Snippet are small fragments of code that can easily created, saved and shared across programmers communities.
This technology has been presented with Visual Studio IDE and it now a widespread way to exchange code among .NET programmers.
Code snippets are embedded in .snippet file, that are plain XML file containing the code along with other useful information regarding the code itself.
In this part of the site you can find a few snippet file created by me, for every snippet you can find a short description on this page and you can directly download the file from here, alternatively you can also go to a page where the code is explained step by step.
You are welcome to send me your comment on these code fragments at snippet@lucamauri.net email address.

Calcolare il CIN di un conto corrente

domenica 08 giugno 2008, 18.39

Il CIN (Control Internal Number) è un tipo di check digit che viene usato dalle banche italiane fin dagli anni '90. E' ancora molto utile in quanto deve essere incorporato nel codice IBAN che da metà del 2008 è sostanzialmente indispensabile per le transazioni monetarie elettroniche.
Pare che su internet ci siano pochissime fonti che spieghino come calcolarlo, l'algoritmo che segue si basa su una spiegazione del modulo Contabilità delle ACG di IBM.
L'ho provato su diversi numeri di C/C e funziona regolarmente.
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VB.net MD4 Message Digest class

domenica 02 marzo 2008, 22.38

First of all I must tell the story of this class.
In first place this is derived in first place from original RSA algorythm, then this class has been implemented by Norbert Hranitzky in Java. This Java class was used by Oren Novotny as base for his excellent C# implementation, finally this class has been translated in VB.net by someone called Bismark Prods in a post at http://www.derkeiler.com/Newsgroups/microsoft.public.dotnet.security/2004-08/0004.html.
This last class was not working and I extensively modified it to make it running right. So, while I have to give credit to others for their job, I am pleased to say that this piece of code is (apparently) the only working VB.net implementation of a MD4 class.

The code is commented so anyone can figure out how the class works. For the people interested in knowing the mathematics behind the algorithm, I suggest the reqading of the original RFC 1320.

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Check and download images

domenica 11 novembre 2007, 17.23

In the following code you can see how to make a conditional download of images.
Let's assume you have a list of image files in a table (from a database, for instance, but any other source will do as well) and the folder on the remote website where the images are.
Those data are set in the very beginning of the file, the only external object you have to instantiate before calling this function is the dataset called dsImgs. Once done, the function will look for all the images in the location and will check if the image already exist on the disk. If this is the case, a check is done on the Last-Modified date and the file is downloaded if the current version is older only.
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WOL .net

martedì 27 marzo 2007, 22.22

Wake-On-LAN (WOL) is a feature of the network interface cards since the late '90s
This functionality was initially conceived by IBM and the widely supported by Intel with NIC's and motherboard's chipset

WOL simply works by broadcasting a so called Magic Packet on the LAN where the device you want to wake-up is on. The Magic Packet is made by a leading HEX string followed by 16 repetition of the target MAC Address.
For the following class to works you must simply create an instance, provide the MAC Address and call the method WakeIt.
The class also includes Intellisense description.

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Statistic .net

venerdì 02 marzo 2007, 09.22

I created this class to help me made the Tag Cloud system for this site. It is a simple class to calculate the arithmetic Mean and the Standard Deviation.
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Get information by WHOIS database

domenica 31 dicembre 2006, 22.55

This simple class help you to programmatically access IP ranges information from WHOIS database. The enumerator in the class already contains the addresses of the three registrars that amanges IP addresses in the World.
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Process text file

domenica 10 dicembre 2006, 15.13

A collection of three simple class that allow you to read files from disk and from internet and write a strem back to a file.
It is a simple task for a programmaer, but it may comes in hand from time to time to have it ready-to-use.
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Extract ED2K links

sabato 09 dicembre 2006, 17.13

Using Regular Expression functions, this class allow you to scan a bunch of text (for esample and HTML page) to extract all the links in ED2K format.
The Collection is exposed by the class.
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Process ED2K links

venerdì 08 dicembre 2006, 15.58

This class show you how to import and process an ED2K link.
ED2K link are links to files in the eDonkey 2000 network, now used both by original vclient and the popular eMule clients.
Every istance of this class represent a single ED2K link that is automatically split into pieces and separated in the proper properties of the class.
From there it is easy to use every single part of the link for your own purpose.
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Risultato del processo OK