Decode an Encoded String

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5.00/5 (1 vote)

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I have been looking for a couple days now and apparently I am not entering the correct search terms to find what I am looking for, so thank you in advance for any help.

I am receiving a string that is encoded from an external datasource so I can't change how I'm receiving the data. My problem is that all the samples I find always talk about using the Encoder class to encode the string into byte[] format and how to decode a byte[] object back to a string.

If someone has a solution or can point me in the right direction it would be appreciated.

so for example:
string strEncoded = "544d444e5036";
As Espen points out this is a hex string so the better question I should have asked is how to get a string storing hex data loaded into a byte[]. I have posted a solution below.

It should decode to "TMDNP6"

It should be a utf-7 or utf-8 encode.

Thanks!!

Posted 5-Aug-11 6:33am

jetskij16

Updated 8-Aug-11 6:52am

v4

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walterhevedeich 5-Aug-11 12:34pm

Do you know or have the code of how the string was encoded?

jetskij16 5-Aug-11 12:52pm

utf-8 or utf-7 this one is 7 but the encoding varies from them.

2 solutions

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jetskij16 · Accepted Answer · 2011-08-08T06:44:00

C#

string data = "544d444e5036";
byte[] tempArray = new byte[data.Length / 2];
for (int i = 0; i < tempArray.Length; i++)
{
   tempArray[i] = Convert.ToByte(data.Substring(i * 2, 2), 16);
}

string decode = Encoding.UTF7.GetString(tempArray);

Espen your suggestions and links lead me to find a solution like the one I'm posting above. Which was found here[^]

If anyone has any comments on the above let me know.

Thank you for your help!

Espen Harlinn · Accepted Answer · 2011-08-05T06:54:00

Solution 1

Here is an extended ascii table:http://www.commfront.com/ascii-chart-table.htm[^]

Hex value of T=54
Hex value of M=4D
Hex value of D=44
Hex value of N=4E
Hex value of P=50
Hex value of 6=36

Convert pairs of charaters to bytes using NumberStyles.HexNumber[^] with the Byte.TryParse[^] method.

This will result in a byte[] array containing the bytes ready for conversion with the Encoding.ASCII.GetChars[^]

Best regards
Espen Harlinn

Posted 5-Aug-11 6:54am

Espen Harlinn

Comments

walterhevedeich 5-Aug-11 12:56pm

Very good advice. My 5.

Espen Harlinn 5-Aug-11 13:01pm

Thanks Walter :)

RaisKazi 5-Aug-11 13:38pm

My 5!

Espen Harlinn 5-Aug-11 13:40pm

Thank you, RaisKazi!

thatraja 5-Aug-11 21:47pm

Simple & Nice

Espen Harlinn 6-Aug-11 5:40am

Thank you, thatraja!

Sergey Alexandrovich Kryukov 6-Aug-11 3:39am

Simple and nice, my 5, yes, but I have no idea how it may make any sense -- but this is OP's problem. I would not try to answer though.
--SA

Espen Harlinn 6-Aug-11 5:40am

Thanks Sergey!

Kim Togo 8-Aug-11 15:39pm

My 5 Espen. Nice.

Espen Harlinn 8-Aug-11 16:35pm

Thank you, Kim!