如何将字节数组转换为十六进制字符串,反之亦然?
当前回答
这是一篇很棒的帖子。我喜欢瓦利德的解决方案。我还没有通过帕特里奇的测试,但似乎很快。我还需要反向过程,将十六进制字符串转换为字节数组,因此我将其作为Waleed解决方案的反向来编写。不确定它是否比托马拉克的原始解决方案更快。同样,我也没有通过帕特里奇的测试运行相反的过程。
private byte[] HexStringToByteArray(string hexString)
{
int hexStringLength = hexString.Length;
byte[] b = new byte[hexStringLength / 2];
for (int i = 0; i < hexStringLength; i += 2)
{
int topChar = (hexString[i] > 0x40 ? hexString[i] - 0x37 : hexString[i] - 0x30) << 4;
int bottomChar = hexString[i + 1] > 0x40 ? hexString[i + 1] - 0x37 : hexString[i + 1] - 0x30;
b[i / 2] = Convert.ToByte(topChar + bottomChar);
}
return b;
}
其他回答
两个mashup,将两个半字节操作合并为一个。
可能非常有效的版本:
public static string ByteArrayToString2(byte[] ba)
{
char[] c = new char[ba.Length * 2];
for( int i = 0; i < ba.Length * 2; ++i)
{
byte b = (byte)((ba[i>>1] >> 4*((i&1)^1)) & 0xF);
c[i] = (char)(55 + b + (((b-10)>>31)&-7));
}
return new string( c );
}
Decadent linq与比特黑客版本:
public static string ByteArrayToString(byte[] ba)
{
return string.Concat( ba.SelectMany( b => new int[] { b >> 4, b & 0xF }).Select( b => (char)(55 + b + (((b-10)>>31)&-7))) );
}
并反转:
public static byte[] HexStringToByteArray( string s )
{
byte[] ab = new byte[s.Length>>1];
for( int i = 0; i < s.Length; i++ )
{
int b = s[i];
b = (b - '0') + ((('9' - b)>>31)&-7);
ab[i>>1] |= (byte)(b << 4*((i&1)^1));
}
return ab;
}
这是一篇很棒的帖子。我喜欢瓦利德的解决方案。我还没有通过帕特里奇的测试,但似乎很快。我还需要反向过程,将十六进制字符串转换为字节数组,因此我将其作为Waleed解决方案的反向来编写。不确定它是否比托马拉克的原始解决方案更快。同样,我也没有通过帕特里奇的测试运行相反的过程。
private byte[] HexStringToByteArray(string hexString)
{
int hexStringLength = hexString.Length;
byte[] b = new byte[hexStringLength / 2];
for (int i = 0; i < hexStringLength; i += 2)
{
int topChar = (hexString[i] > 0x40 ? hexString[i] - 0x37 : hexString[i] - 0x30) << 4;
int bottomChar = hexString[i + 1] > 0x40 ? hexString[i + 1] - 0x37 : hexString[i + 1] - 0x30;
b[i / 2] = Convert.ToByte(topChar + bottomChar);
}
return b;
}
我怀疑这样的速度会使大多数其他测试失败。。。
Public Function BufToHex(ByVal buf() As Byte) As String
Dim sB As New System.Text.StringBuilder
For i As Integer = 0 To buf.Length - 1
sB.Append(buf(i).ToString("x2"))
Next i
Return sB.ToString
End Function
扩展方法(免责声明:完全未经测试的代码,BTW…):
public static class ByteExtensions
{
public static string ToHexString(this byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
{
hex.AppendFormat("{0:x2}", b);
}
return hex.ToString();
}
}
使用Tomalak的三种解决方案之一(最后一种是字符串上的扩展方法)。
为了方便以后复制和粘贴,将几个答案合并到一个类中:
/// <summary>
/// Extension methods to quickly convert byte array to string and back.
/// </summary>
public static class HexConverter
{
/// <summary>
/// Map values to hex digits
/// </summary>
private static readonly char[] HexDigits =
{
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
/// <summary>
/// Map 56 characters between ['0', 'F'] to their hex equivalents, and set invalid characters
/// such that they will overflow byte to fail conversion.
/// </summary>
private static readonly ushort[] HexValues =
{
0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100,
0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100,
0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x000A, 0x000B,
0x000C, 0x000D, 0x000E, 0x000F
};
/// <summary>
/// Empty byte array
/// </summary>
private static readonly byte[] Empty = new byte[0];
/// <summary>
/// Convert a byte array to a hexadecimal string.
/// </summary>
/// <param name="bytes">
/// The input byte array.
/// </param>
/// <returns>
/// A string of hexadecimal digits.
/// </returns>
public static string ToHexString(this byte[] bytes)
{
var c = new char[bytes.Length * 2];
for (int i = 0, j = 0; i < bytes.Length; i++)
{
c[j++] = HexDigits[bytes[i] >> 4];
c[j++] = HexDigits[bytes[i] & 0x0F];
}
return new string(c);
}
/// <summary>
/// Parse a string of hexadecimal digits into a byte array.
/// </summary>
/// <param name="hexadecimalString">
/// The hexadecimal string.
/// </param>
/// <returns>
/// The parsed <see cref="byte[]"/> array.
/// </returns>
/// <exception cref="ArgumentException">
/// The input string either contained invalid characters, or was of an odd length.
/// </exception>
public static byte[] ToByteArray(string hexadecimalString)
{
if (!TryParse(hexadecimalString, out var value))
{
throw new ArgumentException("Invalid hexadecimal string", nameof(hexadecimalString));
}
return value;
}
/// <summary>
/// Parse a hexadecimal string to bytes
/// </summary>
/// <param name="hexadecimalString">
/// The hexadecimal string, which must be an even number of characters.
/// </param>
/// <param name="value">
/// The parsed value if successful.
/// </param>
/// <returns>
/// True if successful.
/// </returns>
public static bool TryParse(string hexadecimalString, out byte[] value)
{
if (hexadecimalString.Length == 0)
{
value = Empty;
return true;
}
if (hexadecimalString.Length % 2 != 0)
{
value = Empty;
return false;
}
try
{
value = new byte[hexadecimalString.Length / 2];
for (int i = 0, j = 0; j < hexadecimalString.Length; i++)
{
value[i] = (byte)((HexValues[hexadecimalString[j++] - '0'] << 4)
| HexValues[hexadecimalString[j++] - '0']);
}
return true;
}
catch (OverflowException)
{
value = Empty;
return false;
}
}
}
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