If you already have a byte array then you will need to know what type of encoding was used to make it into that byte array. For example, if the byte array was created like this: byte[] bytes = Encoding.ASCII.GetBytes(someString); You will need to turn it back into a string like this: string someString = … Read more
On older machines, codes smaller than 8 bits were fairly common, but most of those have been dead and gone for years now. C and C++ have mandated a minimum of 8 bits for char, at least as far back as the C89 standard. [Edit: For example, C90, ยง5.2.4.2.1 requires CHAR_BIT >= 8 and UCHAR_MAX … Read more
The only thing that a computer can store is bytes. To store anything in a computer, you must first encode it, i.e. convert it to bytes. For example: If you want to store music, you must first encode it using MP3, WAV, etc. If you want to store a picture, you must first encode it … Read more
I know it’s equal to sizeof(int). The size of an int is really compiler dependent. Back in the day, when processors were 16 bit, an int was 2 bytes. Nowadays, it’s most often 4 bytes on a 32-bit as well as 64-bit systems. Still, using sizeof(int) is the best way to get the size of … Read more
You opened the file in binary mode: with open(fname, ‘rb’) as f: This means that all data read from the file is returned as bytes objects, not str. You cannot then use a string in a containment test: if ‘some-pattern’ in tmp: continue You’d have to use a bytes object to test against tmp instead: … Read more
MySQL Error #1071 – Specified key was too long; max key length is 767 bytes
Update (2021) – Java 17 now includes java.util.HexFormat (only took 25 years): HexFormat.of().parseHex(s) For older versions of Java: Here’s a solution that I think is better than any posted so far: /* s must be an even-length string. */ public static byte[] hexStringToByteArray(String s) { int len = s.length(); byte[] data = new byte[len / … Read more
The problem is that you’re trying to use a variable that is declared inside a block with a narrower scope (you define crPhoto1Data inside the if block). Another problem is that you’re trying to set it to more than one type. One way solve this is to create the JObject in an if/else statement (or … Read more
Basic approach. Convert to byte array then get the characters you want then format as necesssay. public class Main { public static void main(String[] args) { StringBuilder result = getBinary(“hi there”, 2); System.out.println(result.toString()); } public static StringBuilder getBinary(String str, int numberOfCharactersWanted) { StringBuilder result = new StringBuilder(); byte[] byt = str.getBytes(); for (int i = … Read more