Decode Base64 and Signed 16 Bits Conversion

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Hi everyone,

I have a file with a Base64 string that i have to decode into numbers, and i don't know how to do this in C#.

I know how to convert to binary,using Convert.FromBase64String. However i've got to obtain numbers like coordenates X/Y to plot this into a graph, because this is a ECG signal.

Here's a little piece of signal: HgAeAA8AGQAbAB4AFgAZABsAGwAZABsAIwAgABkAGQAZACAAEQAZACMAIAAj

Hope you can help me, thanks

Posted 10-Jul-13 6:09am

CDCC8

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-07-10T06:13:00

Solution 1

Here: http://msdn.microsoft.com/en-us/library/system.convert.aspx[^].

Look for *Base64* methods of this class.

—SA

Posted 10-Jul-13 6:13am

Sergey Alexandrovich Kryukov

Comments

CDCC8 10-Jul-13 12:28pm

Further Information: I know this data is 16bits Signed.

I've already used Convert.FromBase64String but all i get is strang characters in the command line

here's my code:

public static string Decode(string stringEncoded)
{
// Converte a String em Base64 em Array de Bytes.
byte[] encodedDataAsBytes = System.Convert.FromBase64String(stringEncoded);

// Retorna a String decodificada.
return UnicodeEncoding.Default.GetString(encodedDataAsBytes);
}

CDCC8 10-Jul-13 12:36pm

Can you give me other suggestions?

Sergey Alexandrovich Kryukov 10-Jul-13 14:25pm

I answered your question, that's it. Everything else is absolutely uncertain.

When you say "this data is 16-bit signed", it's next to saying nothing, because signing is not reversable (you can only read signed data or only write encrypted data when you have a public key), and, in all case, you need to know exact version of encryption algorithm and one or both keys, depending on what you need. Public-key encryption is meant to be unbreakable, don't even try. As a matter of fact, I doubt that anything could be "16-bit signed": people don't use just 16 bits for signing, usually it's 1K or more. It could be something else. What? You don't give any information on it.

—SA