I have a byte[]
array that is loaded from a file that I happen to known contains UTF-8. In some debugging code, I need to convert it to a string. Is there a one liner that will do this?
Under the covers it should be just an allocation and a memcopy, so even if it is not implemented, it should be possible.
string result = System.Text.Encoding.UTF8.GetString(byteArray);
System.Text.Encoding.UTF8.GetString(buf).TrimEnd('\0');
- Hi-Angel 2015-07-27 07:53
Encoding.Ascii
yields same result - Assimilater 2017-06-29 00:02
There're at least four different ways doing this conversion.
Encoding's GetString
, but you won't be able to get the original bytes back if those bytes have non-ASCII characters.
BitConverter.ToString
The output is a "-" delimited string, but there's no .NET built-in method to convert the string back to byte array.
Convert.ToBase64String
You can easily convert the output string back to byte array by using Convert.FromBase64String
.
Note: The output string could contain '+', '/' and '='. If you want to use the string in a URL, you need to explicitly encode it.
HttpServerUtility.UrlTokenEncode
You can easily convert the output string back to byte array by using HttpServerUtility.UrlTokenDecode
. The output string is already URL friendly! The downside is it needs System.Web
assembly if your project is not a web project.
A full example:
byte[] bytes = { 130, 200, 234, 23 }; // A byte array contains non-ASCII (or non-readable) characters
string s1 = Encoding.UTF8.GetString(bytes); // ���
byte[] decBytes1 = Encoding.UTF8.GetBytes(s1); // decBytes1.Length == 10 !!
// decBytes1 not same as bytes
// Using UTF-8 or other Encoding object will get similar results
string s2 = BitConverter.ToString(bytes); // 82-C8-EA-17
String[] tempAry = s2.Split('-');
byte[] decBytes2 = new byte[tempAry.Length];
for (int i = 0; i < tempAry.Length; i++)
decBytes2[i] = Convert.ToByte(tempAry[i], 16);
// decBytes2 same as bytes
string s3 = Convert.ToBase64String(bytes); // gsjqFw==
byte[] decByte3 = Convert.FromBase64String(s3);
// decByte3 same as bytes
string s4 = HttpServerUtility.UrlTokenEncode(bytes); // gsjqFw2
byte[] decBytes4 = HttpServerUtility.UrlTokenDecode(s4);
// decBytes4 same as bytes
var decBytes2 = str.Split('-').Select(ch => Convert.ToByte(ch, 16)).ToArray();
drtf 2014-07-13 14:43
A general solution to convert from byte array to string when you don't know the encoding:
static string BytesToStringConverted(byte[] bytes)
{
using (var stream = new MemoryStream(bytes))
{
using (var streamReader = new StreamReader(stream))
{
return streamReader.ReadToEnd();
}
}
}
Definition:
public static string ConvertByteToString(this byte[] source)
{
return source != null ? System.Text.Encoding.UTF8.GetString(source) : null;
}
Using:
string result = input.ConvertByteToString();
Converting a byte[]
to a string
seems simple but any kind of encoding is likely to mess up the output string. This little function just works without any unexpected results:
private string ToString(byte[] bytes)
{
string response = string.Empty;
foreach (byte b in bytes)
response += (Char)b;
return response;
}
Using (byte)b.ToString("x2")
, Outputs b4b5dfe475e58b67
public static class Ext {
public static string ToHexString(this byte[] hex)
{
if (hex == null) return null;
if (hex.Length == 0) return string.Empty;
var s = new StringBuilder();
foreach (byte b in hex) {
s.Append(b.ToString("x2"));
}
return s.ToString();
}
public static byte[] ToHexBytes(this string hex)
{
if (hex == null) return null;
if (hex.Length == 0) return new byte[0];
int l = hex.Length / 2;
var b = new byte[l];
for (int i = 0; i < l; ++i) {
b[i] = Convert.ToByte(hex.Substring(i * 2, 2), 16);
}
return b;
}
public static bool EqualsTo(this byte[] bytes, byte[] bytesToCompare)
{
if (bytes == null && bytesToCompare == null) return true; // ?
if (bytes == null || bytesToCompare == null) return false;
if (object.ReferenceEquals(bytes, bytesToCompare)) return true;
if (bytes.Length != bytesToCompare.Length) return false;
for (int i = 0; i < bytes.Length; ++i) {
if (bytes[i] != bytesToCompare[i]) return false;
}
return true;
}
}
There is also class UnicodeEncoding, quite simple in usage:
ByteConverter = new UnicodeEncoding();
string stringDataForEncoding = "My Secret Data!";
byte[] dataEncoded = ByteConverter.GetBytes(stringDataForEncoding);
Console.WriteLine("Data after decoding: {0}", ByteConverter.GetString(dataEncoded));
UnicodeEncoding
is the worst class name ever; unicode isn't an encoding at all. That class is actually UTF-16. The little-endian version, I think - Nyerguds 2016-11-17 08:16
Alternatively:
var byteStr = Convert.ToBase64String(bytes);
A Linq one-liner for converting a byte array byteArrFilename
read from a file to a pure ascii C-style zero-terminated string would be this: Handy for reading things like file index tables in old archive formats.
String filename = new String(byteArrFilename.TakeWhile(x => x != 0)
.Select(x => x < 128 ? (Char)x : '?').ToArray());
I use '?'
as default char for anything not pure ascii here, but that can be changed, of course. If you want to be sure you can detect it, just use '\0'
instead, since the TakeWhile
at the start ensures that a string built this way cannot possibly contain '\0'
values from the input source.
BitConverter
class can be used to convert a byte[]
to string
.
var convertedString = BitConverter.ToString(byteAttay);
Documentation of BitConverter
class can be fount on MSDN
To my knowledge none of the given answers guarantee correct behavior with null termination. Until someone shows me differently I wrote my own static class for handling this with the following methods:
// Mimics the functionality of strlen() in c/c++
// Needed because niether StringBuilder or Encoding.*.GetString() handle \0 well
static int StringLength(byte[] buffer, int startIndex = 0)
{
int strlen = 0;
while
(
(startIndex + strlen + 1) < buffer.Length // Make sure incrementing won't break any bounds
&& buffer[startIndex + strlen] != 0 // The typical null terimation check
)
{
++strlen;
}
return strlen;
}
// This is messy, but I haven't found a built-in way in c# that guarentees null termination
public static string ParseBytes(byte[] buffer, out int strlen, int startIndex = 0)
{
strlen = StringLength(buffer, startIndex);
byte[] c_str = new byte[strlen];
Array.Copy(buffer, startIndex, c_str, 0, strlen);
return Encoding.UTF8.GetString(c_str);
}
The reason for the startIndex
was in the example I was working on specifically I needed to parse a byte[]
as an array of null terminated strings. It can be safely ignored in the simple case
byteArr.TakeWhile(x => x != 0)
is a quick and easy way to solve the null termination problem - Nyerguds 2017-09-21 09:11
Try this:
string myresult = System.Text.Encoding.UTF8.GetString(byteArray);
hier is a result where you didnt have to bother with encoding. I used it in my network class and send binary objects as string with it.
public static byte[] String2ByteArray(string str)
{
char[] chars = str.ToArray();
byte[] bytes = new byte[chars.Length * 2];
for (int i = 0; i < chars.Length; i++)
Array.Copy(BitConverter.GetBytes(chars[i]), 0, bytes, i * 2, 2);
return bytes;
}
public static string ByteArray2String(byte[] bytes)
{
char[] chars = new char[bytes.Length / 2];
for (int i = 0; i < chars.Length; i++)
chars[i] = BitConverter.ToChar(bytes, i * 2);
return new string(chars);
}
In adition to the selected answer, if you're using .NET35 or .NET35 CE, you have to specify the index of the first byte to decode, and the number of bytes to decode:
string result = System.Text.Encoding.UTF8.GetString(byteArray,0,byteArray.Length);