The extra two digits are used to define the colors’ transparency, or alpha channel. Android uses the ARGB format (or AARRGGBB as you use in your example). For more (Android-specific) information, take a look at the Color documentation.
It is also important to note that ord(‘q’) can return different numbers if you have NumLock activated (maybe it is also happening with other keys). For example, when pressing c, the code: key = cv2.waitKey(10) print(key) returns 1048675 when NumLock is activated 99 otherwise Converting these 2 numbers to binary we can see: 1048675 = … Read more
String.format(“%02X”, value); If you use X instead of x as suggested by aristar, then you don’t need to use .toUpperCase().
Joshua Weinberg’s answer is mostly correct, however the 0x prefix is optional when scanning hexadecimal integers. If you have a string in the format #01FFFFAB, you can still use NSScanner, but you can skip the first character. unsigned result = 0; NSScanner *scanner = [NSScanner scannerWithString:@”#01FFFFAB”]; [scanner setScanLocation:1]; // bypass ‘#’ character [scanner scanHexInt:&result];
If I understand you correctly, this should do the trick. You’ll need add using System.IO at the top of your file if you don’t already have it. public bool ByteArrayToFile(string fileName, byte[] byteArray) { try { using (var fs = new FileStream(fileName, FileMode.Create, FileAccess.Write)) { fs.Write(byteArray, 0, byteArray.Length); return true; } } catch (Exception ex) … Read more
You can now do: let n = 14 var st = String(format:”%02X”, n) st += ” is the hexadecimal representation of \(n)” print(st) 0E is the hexadecimal representation of 14 Note: The 2 in this example is the field width and represents the minimum length desired. The 0 tells it to pad the result with … Read more
If you want to convert hex to rgb you can use sscanf: <?php $hex = “#ff9900”; list($r, $g, $b) = sscanf($hex, “#%02x%02x%02x”); echo “$hex -> $r $g $b”; ?> Output: #ff9900 -> 255 153 0
printf(“%02X:%02X:%02X:%02X”, buf[0], buf[1], buf[2], buf[3]); For a more generic way: int i; for (i = 0; i < x; i++) { if (i > 0) printf(“:”); printf(“%02X”, buf[i]); } printf(“\n”); To concatenate to a string, there are a few ways you can do this. I’d probably keep a pointer to the end of the string … Read more
result = bytes.fromhex(some_hex_string)
Here’s a short way to convert it to hex: public String toHex(String arg) { return String.format(“%040x”, new BigInteger(1, arg.getBytes(/*YOUR_CHARSET?*/))); }