C# ByteString to ASCII String

Question

I am looking for a smart way to convert a string of hex-byte-values into a string of 'real text' (ASCII Characters).

For example I have the word "Hello" written in Hexadecimal ASCII: 48 45 4C 4C 4F. And using some method I want to receive the ASCII text of it (in this case "Hello").

// I have this string (example: "Hello") and want to convert it to "Hello".
string strHexa = "48454C4C4F";

// I want to convert the strHexa to an ASCII string.
string strResult = ConvertToASCII(strHexa);

I am sure there is a framework method. If this is not the case of course I could implement my own method.

Thanks!

You have two problems. First you must convert the hexadecomal string to a byte array, after which you can call Encoding.ASCII.GetString(byteArray). — CodeCaster
– CodeCaster, Commented Feb 12, 2014 at 10:42
First convert the hex string to to bytes, then use Encoding.ASCII (or better, UTF8) to convert the bytes to a string. — CodesInChaos
– CodesInChaos, Commented Feb 12, 2014 at 10:42

L.B · Accepted Answer · 2014-02-12 10:44:04Z

2

var str = Encoding.UTF8.GetString(SoapHexBinary.Parse("48454C4C4F").Value); //HELLO

PS: SoapHexBinary is in System.Runtime.Remoting.Metadata.W3cXsd2001 namespace

answered Feb 12, 2014 at 10:44

L.B

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8 Comments

M. Mimpen Over a year ago

Don't you think that using System.Runtime is a bit of farfetched to convert the hexadecimal string to a byte array? As a new programmer on your team I would blink twice before understanding.

Henk Holterman Over a year ago

But then with Encoding.ASCII

yohannist Over a year ago

@L.B, quick question, why //HELL ?

El Mac Over a year ago

Ok but I have one more problem. If I have letters like äöü they will get 'destroyed'. Is there a way to transform this input value from ASCII to unicode or something that can display special characters? I get the input string from a piece of hardware which I can't change.

L.B Over a year ago

@ElMac it is surely not ASCII. try to use different encodings such as Windows-1252, Windows-1254 etc. Usage: Encoding.GetEncoding("Windows-1252").GetString(....)

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Community · Accepted Answer · 2017-05-23 10:33:22Z

2

I am sure there is a framework method.

A a single framework method: No.

However the second part of this: converting a byte array containing ASCII encoded text into a .NET string (which is UTF-16 encoded Unicode) does exist: System.Text.ASCIIEncoding and specifically the method GetString:

string result = ASCIIEncoding.GetString(byteArray);

The First part is easy enough to do yourself: take two hex digits at a time, parse as hex and cast to a byte to store in the array. Seomthing like:

byte[] HexStringToByteArray(string input) {
  Debug.Assert(input.Length % 2 == 0, "Must have two digits per byte");
  var res = new byte[input.Length/2];

  for (var i = 0; i < input.Length/2; i++) {
    var h = input.Substring(i*2, 2);
    res[i] = Convert.ToByte(h, 16);
  }

  return res;
}

Edit: Note: L.B.'s answer identifies a method in .NET that will do the first part more easily: this is a better approach that writing it yourself (while in a, perhaps, obscure namespace it is implemented in mscorlib rather than needing an additional reference).

edited May 23, 2017 at 10:33

CommunityBot

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answered Feb 12, 2014 at 10:52

Richard

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1 Comment

M. Mimpen Over a year ago

The Assert() is a nice touch, good to see it being used in a easy and proper way!

jiten · Accepted Answer · 2014-02-12 11:00:29Z

0

  StringBuilder sb = new StringBuilder();  
  for (int i = 0; i < hexStr.Length; i += 2)
    {
        string hs = hexStr.Substring(i, 2);
        sb.Append(Convert.ToByte(hs, 16));
    }

edited Feb 12, 2014 at 11:00

answered Feb 12, 2014 at 10:53

jiten

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1 Comment

Richard Over a year ago

One question: why unsigned int as an intermediate type rather than byte?

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