Converting int32 -> hex -> string

Question

I'm reading an integer from the memory (i below). To convert it in to the character that I'm after I do the following:

int i = 99;
string hex = 99.ToString("X"); //"63"
string readable = hex.FromHex(); //"c"

public static string FromHex(this string hex)
{
    hex = hex.Replace("-", "");
    byte[] raw = new byte[hex.Length / 2];
    for (int i = 0; i < raw.Length; i++)
    {
        raw[i] = Convert.ToByte(hex.Substring(i * 2, 2), 16);
    }
    return Encoding.UTF8.GetString(raw);
}

But I suppose there is an easier way to accomplish this?

Zbigniew · Accepted Answer · 2013-08-14 16:26:26Z

2

You can convert it straight to char:

char myChar = (char)99;

or use:

char myChar = Convert.ToChar(99);

answered Aug 14, 2013 at 16:26

Zbigniew

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5 Comments

Tim S. Over a year ago

I may be wrong, but I don't think this decodes using UTF8 encoding, but UTF16. Might not matter if you're only dealing with ordinary characters like c.

Zbigniew Over a year ago

Well, this works for ordinary characters like c. Which I assume to be the case (since Johan hasn't mentioned more).

Zbigniew Over a year ago

It should also work for other characters, e.g. you can try to replace 99 with 1337. It will produce Թ character.

Jon Skeet Over a year ago

@TimS.: I believe the original approach is fundamentally broken anyway. It's unclear what the OP is really trying to achieve, but I suspect this may be it.

Johan Over a year ago

Yup, to clarify it's "a", "b", "c" and "d". So works perfect for me. Thanks

Zeph · Accepted Answer · 2013-08-14 16:30:53Z

1

Try

int i = 99;
var bits = BitConverter.GetBytes(i);
Console.Write("Char: {0}", Encoding.UTF8.GetString(bits));

answered Aug 14, 2013 at 16:30

Zeph

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Comments

Tim S. · Accepted Answer · 2013-08-14 16:39:09Z

1

This should work, assuming UTF8 encoding:

byte[] bytes = BitConverter.GetBytes(i).Where(x => x != 0).ToArray();
string result = Encoding.UTF8.GetString(bytes);

But take note that the endianness of the machine(s) you run this on matters.

edited Aug 14, 2013 at 16:39

answered Aug 14, 2013 at 16:31

Tim S.

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