C# I have a string in ascii and need to be transformed into hex

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Hello I have a string in ascii and need to be transformed into hex
example :
asci :"

<stx><stx>000000000001000<fs>1000<fs><fs>+0<fs>941<fs><fs><fs><fs><fs><fs><fs><fs><fs><fs><fs>00<fs><fs><fs><etx> "

need convert in :
hex :"

02 02 30 30 30 30 30 30 30 30 30 30 30 31 30 30 30 1C 31 30 30 30 1C 1C 2B 30 1C 39 34 31 1C 1C 1C 1C 1C 1C 1C 1C 1C 1C 1C 30 30 1C 1C 1C 03 14

I have not found any way that the result is of this form "

02 02 30 30 30 30 30 30 30 30 30 30 30 31 30 30 30 1C 31 30 30 30 1C 1C 2B 30 1C 39 34 31 1C 1C 1C 1C 1C 1C 1C 1C 1C 1C 1C 30 30 1C 1C 1C 03 14

thank you and wait for your answer

What I have tried:

C#

public static string ConvertStringToHex(string asciiString)
        {
            string hex = "";
            foreach (char c in asciiString)
            {
                int tmp = c;
                hex += String.Format("{0:x2}", (uint)System.Convert.ToUInt32(tmp.ToString()));
            }
            return hex;
        }

but the result is : >

3c5354583e3c5354583e3030303030303030303030313130303c46533e313233343c46533e3c46533e2b303c46533e3934313c46533e3c46533e3c46533e3c46533e3c46533e3c46533e3c46533e3c46533e3c46533e3c46533e3c46533e30303c46533e3c46533e3c46533e3c4554583e

I need :

02 02 30 30 30 30 30 30 30 30 30 30 30 31 30 30 30 1C 31 30 30 30 1C 1C 2B 30 1C 39 34 31 1C 1C 1C 1C 1C 1C 1C 1C 1C 1C 1C 30 30 1C 1C 1C 03 14

Posted 1-Jul-18 22:54pm

Member 12017921

Updated 2-Jul-18 4:19am

CHill60

v2

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Eric Lynch · Answer 1 · 2018-07-02T03:12:00

If you need to use actual text, like "<stx>", in your string to represent a control character, as other solutions have suggested, you'll need to write a parser.

If, instead, you are unfamiliar with representing them in C# strings, you can use the following:

C#

ConvertStringToHex("\x0002\x0002000000000001000\x001C1000\x001C\x001C+0\x001C941\x001C\x001C\x001C\x001C\x001C\x001C\x001C\x001C\x001C\x001C\x001C00\x001C\x001C\x001C\x0003")

Assuming your string is truly limited to code points from 0-255, and you don't need to parse text like "<stx>", the following will do what you need:

public static string ConvertStringToHex(string asciiString)
{
  var builder = new StringBuilder(asciiString.Length * 3);
  foreach (char c in asciiString)
    if (c < byte.MinValue || c > byte.MaxValue)
      throw new ArgumentException(null, nameof(asciiString));
    else
      builder.AppendFormat("{0:X2} ", (byte)c);
  if (builder.Length > 0)
    builder.Length--;
  return builder.ToString();
}

There are a few things to note in this code.

First, your original code built a string by repeated concatenation. This is a bad idea. A string builder is much more efficient for this sort of operation.

Second, your original code jumped through an awful lot of hoops to get a number from a character. This is unnecessary. You can directly cast a char to most numeric types.

Finally, just in case code points beyond the 0-255 range slip into one of your strings, I added a check and throw an exception to alert the consumer.

CPallini · Answer 2 · 2018-07-01T23:15:00

Solution 1

That doesn't work because the original string contains the textual representation of the control ASCII codes (instead of the actual ones). You have to properly parse it.

Posted 1-Jul-18 23:15pm

CPallini

F-ES Sitecore · Answer 3 · 2018-07-02T00:15:00

You can use regex to split the text into sections of codes and non-codes then parse them accordingly

string ascii = @"<stx><stx>000000000001000<fs>1000<fs><fs>+0<fs>941<fs><fs><fs><fs><fs><fs><fs><fs><fs><fs><fs>00<fs><fs><fs><etx>";

// match any chars in angle brackets, or any groups that are numbers or +
Regex r = new Regex(@"([<]\w+[>]|[\d|+]+)");

MatchCollection mc = r.Matches(ascii);

StringBuilder result = new StringBuilder();

// go through the results
foreach(Match m in mc)
{
    string v = m.Value;

    if (v.StartsWith("<") && v.EndsWith(">"))
    {
        // if it's a code (eg <stx>) use ConvertCodeToHex
        result.Append(ConvertCodeToHex(v));
    }
    else
    {
        // if it's not a code use ConvertStringToHex
        result.Append(ConvertStringToHex(v));
    }
}

string hex = result.ToString();

Now you just need to implement ConvertCodeToHex (there might be a function that does this already)

public static string ConvertCodeToHex(string code)
{
    // add the remaining cases
    switch (code.ToLower())
    {
        case "<stx>":
            return "02";
        default:
            return code;
    }
}

Patrice T · Answer 4 · 2018-07-02T04:20:00

Your problem is that your string is escaped to show you non printable chars.
every char with an ascii value between 0 and 31 is non printable and is showed to you as '<??>' the inner code telling you which code it is.
In order to print the string in hex, you have basically 3 options:
- work with non escaped string in first place.
- reconvert the escaped string to its original form (binary), then print
- handle escaped chars on fly while printing

In order to get the output format you want, you need to add a space between each hex:

C#

public static string ConvertStringToHex(string asciiString)
        {
            string hex = "";
            foreach (char c in asciiString)
            {
                int tmp = c;
                // pay attention to the space at the end of format
                hex += String.Format("{0:x2} ", (uint)System.Convert.ToUInt32(tmp.ToString()));
            }
            return hex;
        }

The only problem is a space at the end of string, to solve it, you need a for loop.

C#

public static string ConvertStringToHex(string asciiString)
        {
            int tmp = asciiString[0];
            string hex = String.Format("{0:x2}", tmp);
            for (int scan= 1; scan<asciiString.length; scan++)
            {
                int tmp = asciiString[scan];
                hex += String.Format(" {0:x2}", tmp);
            }
            return hex;
        }

C# I have a string in ascii and need to be transformed into hex

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