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Using int as numeric string representation in C #

I'm trying to use an integer as a numeric representation of a string, for example storing "ABCD" as 0x41424344. However, when it comes to output, I need to convert the integer back to 4 ASCII characters. Right now I am using bit shifts and masking as shown below:

int value = 0x41424344;
string s = new string (
              new char [] { 
                 (char)(value >> 24), 
                 (char)(value >> 16 & 0xFF),
                 (char)(value >> 8 & 0xFF),
                 (char)(value & 0xFF) });

Is there a cleaner way to do this? I tried various roles, but the compiler complained about this as expected.

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5 answers 


int value = 0x41424344;
string s = Encoding.ASCII.GetString(
               BitConverter.GetBytes(value).Reverse().ToArray());


(The above assumes you are on a little-endian system. For big-endian you can just drop the part .Reverse().ToArray()

, although if you are on a little-endian system it will probably make sense for you to just store "ABCD" as 0x44434241, if possible.)

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The characters are 16 bits, so you need to encode them into eight bit values ​​in order to pack them into an integer. You can use class Encoding

to convert between characters and bytes and class BitConverter

to convert between bytes and integer

Here's a conversion in both directions:

string original = "ABCD";

int number = BitConverter.ToInt32(Encoding.ASCII.GetBytes(original), 0);

string decoded = Encoding.ASCII.GetString(BitConverter.GetBytes(number));

Note that the byte order of integers depends on the security of the computer. On a small system system, the numeric value "ABCD" would be 0x44434241. To get the reverse order, you can reverse the byte array:



byte[] data = Encoding.ASCII.GetBytes(original);
Array.Reverse(data);
int number = BitConverter.ToInt32(data, 0);

byte[] data2 = BitConverter.GetBytes(number);
Array.Reverse(data2);
string decoded = Encoding.ASCII.GetString(data2);

Or, if you are using framework 3.5:

int number =
  BitConverter.ToInt32(Encoding.ASCII.GetBytes(original).Reverse().ToArray() , 0);

string decoded =
  Encoding.ASCII.GetString(BitConverter.GetBytes(number).Reverse().ToArray());
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public string ConvertToHex(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;
}

It will convert the string to hex as you need.

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public static string ToHexString(string value)
{
    return value.Aggregate(new StringBuilder("0x"),
        (sb, c) => sb.AppendFormat("{0:x2}", (int)c)).ToString();
}
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if the string is never longer than 8 characters and is some sort of Hexstring, you can use the base variable 16 will consider the conversion functions from the Convert class.

string s = "ABCD";
uint i = Convert.ToUInt32( s, 16 );
MessageBox.Show( Convert.ToString( i, 16 ) );

Regards Sorry,

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