Try: printf(“%04x”,a); 0 – Left-pads the number with zeroes (0) instead of spaces, where padding is specified. 4 (width) – Minimum number of characters to be printed. If the value to be printed is shorter than this number, the result is right justified within this width by padding on the left with the pad character. … Read more
Starting with Python 3.6, you can: >>> value = 42 >>> padding = 6 >>> f”{value:#0{padding}x}” ‘0x002a’ for older python versions use the .format() string method: >>> “{0:#0{1}x}”.format(42,6) ‘0x002a’ Explanation: { # Format identifier 0: # first parameter # # use “0x” prefix 0 # fill with zeroes {1} # to a length of n … Read more
Convert.ToInt32(“3A”, 16)
The deserialize_with attribute The easiest solution is to use the Serde field attribute deserialize_with to set a custom serialization function for your field. You then can get the raw string and convert it as appropriate: use serde::{de::Error, Deserialize, Deserializer}; // 1.0.94 use serde_json; // 1.0.40 #[derive(Debug, Deserialize)] struct EtheriumTransaction { #[serde(deserialize_with = “from_hex”)] account: u64, … Read more
echo -n “Hello” | od -A n -t x1 Explanation: The echo program will provide the string to the next command. The -n flag tells echo to not generate a new line at the end of the “Hello”. The od program is the “octal dump” program. (We will be providing a flag to tell it … Read more
Like so? static void Main() { byte[] data = FromHex(“47-61-74-65-77-61-79-53-65-72-76-65-72”); string s = Encoding.ASCII.GetString(data); // GatewayServer } public static byte[] FromHex(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 raw; }
The number 0 in {0:X} refers to the position in the list or arguments. In this case 0 means use the first value, which is Blue. Use {1:X} for the second argument (Green), and so on. colorstring = String.Format(“#{0:X}{1:X}{2:X}{3:X}”, Blue, Green, Red, Space); The syntax for the format parameter is described in the documentation: Format … Read more
Whoa. You’re really over-complicating it by a very long distance. Try: >>> print(hex(0x12ef ^ 0xabcd)) 0xb922 You seem to be ignoring these handy facts, at least: Python has native support for hexadecimal integer literals, with the 0x prefix. “Hexadecimal” is just a presentation detail; the arithmetic is done in binary, and then the result is … Read more
Another way to do this is by using the bitstring module: >>> from bitstring import BitArray >>> input_str=”0xff” >>> c = BitArray(hex=input_str) >>> c.bin ‘0b11111111’ And if you need to strip the leading 0b: >>> c.bin[2:] ‘11111111’ The bitstring module isn’t a requirement, as jcollado‘s answer shows, but it has lots of performant methods for … Read more
Luminosity Contrast algorithm I think the best way is the Luminosity Contrast algorithm: function getContrastColor($hexColor) { // hexColor RGB $R1 = hexdec(substr($hexColor, 1, 2)); $G1 = hexdec(substr($hexColor, 3, 2)); $B1 = hexdec(substr($hexColor, 5, 2)); // Black RGB $blackColor = “#000000”; $R2BlackColor = hexdec(substr($blackColor, 1, 2)); $G2BlackColor = hexdec(substr($blackColor, 3, 2)); $B2BlackColor = hexdec(substr($blackColor, 5, 2)); … Read more