Hex String To Byte Array Python

Only problem is that cant cast my bool array into Byte. In this Java tutorial, I will show you how to convert Byte array to BLOB in Java. After that we will show how to use that byte array to display image on web page. I want to convert from String to Byte whereas the resulted Array equal to my first Important note: I do not know the Without knowing the code page that used to get the original array myArray i want that: convert from Byte array to string then to Byte array again Not from string to Byte array then to string. Decimal Number To Byte(s) And String To Byte(s) Converter. Strings are stored with two bytes per character. Generally, I'm dealing with a byte stream that I want to output as a string of hex. The prefix is a signed integer (thus 4 bytes) 8 TAG_String A length-prefixed modified UTF-8 string. com/public/qlqub/q15. I've been told that I can do this via SQL but after a lot of Googling & trying to guess my way through it as a layperson I haven't had any success. First of all, the byte type in Java is an 8-bit signed two's complement integer. Using that you can get the String from a byte array. How to: Convert Between Hexadecimal Strings and Numeric Types (C# Programming Guide) 07/20/2015; 3 minutes to read +6; In this article. Whenever the Python script compiles, it automatically generates a compiled code called as byte code. py Original values: (1, 'ab', 2. Base64 encode your data in a hassle-free way, or decode it into human-readable format. One of its bytes represents output states. Convert string to char array. The hexadecimal string representation of a single byte requires two characters, so a hex representation of a bytes string will be twice the length. byteorder ) returns a hex string in small letter. bitLen() can be modified to also provide the count of the number of set bits in the integer. length* 2 );. If the String instance didn't hold a value in the range that fits in a byte, it will be truncated to fit, so be aware that that can happen. I've been told that I can do this via SQL but after a lot of Googling & trying to guess my way through it as a layperson I haven't had any success. BillWoodruff 29-Nov-13 2:23am Every ASCII character in a string, if converted to hex, takes two bytes to represent. Python HOME Python Intro Python Get Started Python Syntax Python Comments Python Variables Python Numbers Python Casting Python Strings Python Operators Python Lists Python Tuples Python Sets Python Dictionaries Python IfElse Python While Loops Python For Loops Python Functions Python Lambda Python Arrays Python Classes/Objects Python. By mkyong Code snippets to show you how to convert string to bytes and vice #string P. When you read any kind of file from a hard disk you get back an array of bytes, whether that data be a jpeg image or some text or anything. Array of dbus. String strHEX; byte byteVal = 0x0F; // To read back as a hex format strHEX = string. The above would be the preferred method if you want to concatenate only two byte strings. Byte arrays are objects in python. String to Hexadecimal. Until it is absolute necessary, DO NOT convert between string and byte array. Thus the ability to type it (in case of unchecked user input) creates a vulnerability known as null byte injection and can lead to security exploits. An array is instantiated with an argument describing the type of data to be allowed, and possibly an initial sequence of data to store in the array. I am using the following code to do this: function toHexString(bytes) { return bytes. Guessed on your output image it's a charset problem. A null-terminated byte string (NTBS) is a sequence of nonzero bytes followed by a byte with value zero (the terminating null character). Java Byte Code is the language to which Java source is compiled and the Java Virtual Machine understands. Strings in 3. The binary representation of the id is compatible with Mongo 12 byte Object IDs. The Python 2 str class, which is limited to single-byte ASCII characters does two separate things: it represents text as well as a collection of bytes. We also have a finalPath where the bytes are to be written. Today we will learn how to convert String to byte array in java. The format function converts the bytes in hexadecimal format. Here we will take an integer value in hexadecimal format and then extract all 4 bytes in different four variables. Use that to get a numeric value. In fact, it can be done in a single line. Thank-you. Python中byte、hex、string转换 2015年04月10日 14:33:46 woodboy000 阅读数 2766 版权声明:本文为博主原创文章,遵循 CC 4. This is only showing you what is in index 0, and not the full array (use a for loop), also the result you are seeing is the character based on value in index 0. We use %02X to print two places (02) of Hexadecimal (X) value and store it in the string st. Until it is absolute necessary, DO NOT convert between string and byte array. A null-terminated byte string (NTBS) is a sequence of nonzero bytes followed by a byte with value zero (the terminating null character). You might want to look at the struct module. Here we will take an integer value in hexadecimal format and then extract all 4 bytes in different four variables. Is there a script to convert objectSID to readable string during user account (byte array) to Decimal string (SDDL) (byte array) to Hex string. Appends the string str to this byte array. 0 by-sa 版权协议,转载请附上原文出处链接和本声明。. com/ Please Like and Share :) Download source. Generating a consistent HMAC SHA1 across multiple languages and mirror the java byte array (byte[]) mechanism. How to Convert a List to String HowTo; Python How-To's; How to Convert Int to Bytes in Python 2 and Python 3; How to Convert Int to Bytes in Python 2 and Python 3. 7下面字节 数组 ( Byte Array)和 16进制 字符串(HexString)转化 12-21 阅读数 5156. Please try again later. C# Convert String to Byte Array This C# article converts a string to a byte array. Data-type of the resulting array; default: float. We have seen that the data stored in the memory of a computer depends on which architecture the CPU uses. DIR folder without any extensions. com/public/qlqub/q15. import time import serial import sys import binascii import inspect # This function takes a command string and sends individual bytes. What's the correct way to convert bytes to a hex string in Python 3? I see claims of a bytes. Idiom #176 Hex string to byte array. Following is a complete list of Python 3. This page provides Java source code for dpg. Use that to get a numeric value. Using this hex string, we convert it to an integer, telling the int() function that it's a base 16 string (because hex is base 16). Hi, Right now I'm trying to write a list of hex values (strings) to a disk file in Python 3. Email codedump link for Converting a hex string to a byte array. Byte, not a Python array, so Python's standard array module is not going to help you. Note that generators should return byte strings for Python 3k. encoding (Optional) - if source is a string, the encoding of the string. The type of an unprefixed string literal is const char [N], where N is the size of the string in code units of the execution narrow encoding, including the null terminator. But I'll assume you mean an array of bytes. I need to hash them using SHA-256 & generate an individual hash for each email address. See, the difference between C and something like Python is, that Python has two sorts of strings: the normal string, which would be including UTF16 and the byte string, which would be considered pure 8 bit data. String strHEX; byte byteVal = 0x0F; // To read back as a hex format strHEX = string. You can prefix it with "b" to get a bytes object or use. In this example, the format specifier calls for an integer or long value, a two character string, and a floating point number. The hex() function converts an integer to the corresponding hexadecimal number in string form and returns it. For example, "6E-1D-9A-00". Often, some kind of separator is used to make the encoded data easier for human reading. I can not just send a string. However, I don't think I stated clearly what I needed. I have a byte array and want convert it into hex string. Python String to bytes conversion can be done in two ways: Using bytes() constructor and passing string and encoding as argument. Byte arrays are objects in python. If you have this prefix and a. Python program to convert hex string to decimal In Python, element conversion has been a very useful utility as it offers it in a much simpler way that other languages. We need to prepare hex string before could convert hex to a byte array and vice versa, and I noticed many forum create a small function to do the conversion from string to hex and convert a string to byte. Convert byte array to hex string in Java - CodeSpeedy. I have a windows 1251 encoded string that needs to be converted to HEX or binary (but if I manage to convert it to one of the two, I'll be able to convert it to the other). It is a small code that you create for a project, combierte small chains hex to bytes that return by a list of corresponding bytes. If len is negative, the length of the string will be determined automatically using qstrlen(). Cycle through the array picking 16 bits of data at a time from the digits and then accumulate the new hex string. 7下面字节 数组 ( Byte Array)和 16进制 字符串(HexString)转化 12-21 阅读数 5156. The method using the math module is much faster, especially on huge numbers with hundreds of decimal digits. The binary representation of the id is compatible with Mongo 12 byte Object IDs. In the above program, we have a byte array named bytes. 代写MIPS指令转换器,在MIPS指令和MIPS语言进行转换。 Introduction. We need to prepare hex string before could convert hex to a byte array and vice versa, and I noticed many forum create a small function to do the conversion from string to hex and convert a string to byte. What's the correct way to convert bytes to a hex string in Python 3? I see claims of a bytes. x, bytes in python3). toString(16) }). For example, chr(97) returns the string 'a'. This example shows you how to use the BitConverter class to convert an array of bytes to an int and back to an array of bytes. Java Byte Code is the language to which Java source is compiled and the Java Virtual Machine understands. ) Size of the data (how many bytes is in e. encoding (Optional) - if source is a string, the encoding of the string. I am a Java novice and ended up using BigInteger and watching out for leading hex zeros. String to byte array. Data-type of the resulting array; default: float. The String class has a toInt() method. Obtain the char that corresponds to each value in a hexadecimal string. If you prefix it with "u" you get a "unicode" object which is stored as Unicode code points. "02" in format is used to pad required leading zeroes. Please guide me. The variable arguments must be C types and must correspond exactly to the format characters in the format string. To do that use the byte value as you would an integer value. 1, “Configuring the Server”. c0ffee bytes. 当我们解析通信协议或者16进制文件,java程序一般会把内容转换成byte[],就会涉及到字符和数组的转换。查了很多资料,有很多大神写了解决此问题的方法,但是现在根据我的实际情况,站在巨人的肩膀上,进. In this conversion you would not need to generate the intermediate byte array as you could go directly to the hexadecimal string. Only problem is that cant cast my bool array into Byte. The string representation uses base32 hex (without padding) for better space efficiency when stored in that form (20 bytes). But be careful about the direction:. I couldn't have phrased it better than the person that posted the same question here. Bytes objects are immutable sequences of single bytes in the range between o and 255 (inclusive). How to convert hex string into int in Python? Python Server Side Programming Programming. source (Optional) - source to initialize the array of bytes. C# Convert String to Byte Array This C# article converts a string to a byte array. Return Value: This method returns a string of hexadecimal pairs separated by hyphens, where each pair represents the corresponding element in value. Introduction Return the integer represented by the given array of bytes. Every byte of data is converted into the corresponding 2-digit hex representation. encoding (Optional) - if source is a string, the encoding of the string. com In this tutorial, we will show you how to convert hex to a byte array and vice verse in vb. bitLenCount() In common usage, the "bit count" of an integer is the number of set (1) bits, not the bit length of the integer described above. The struct module includes functions for converting between strings of bytes and native Python data types such as numbers and strings. com I write a lot of ad-hoc protocol analysers using Python. Thus the ability to type it (in case of unchecked user input) creates a vulnerability known as null byte injection and can lead to security exploits. Apologies if this has been asked before, I couldn't find what I needed to do in my googling. byteorder ) returns a hex string in capital letters. To convert hex string to byte array, you need to first get the length of the given string and include it while creating a new byte array. Often, some kind of separator is used to make the encoded data easier for human reading. Ways to construct a byte array using the bytearray function: 1) Using a string as a source for the bytearray: A string is nothing but a collection of characters and each character of the string is represented by a numeric value. Take a C printf()-style format string and a variable number of arguments, calculate the size of the resulting Python bytes object and return a bytes object with the values formatted into it. The following code snippet converts different float, long, short, char, and boolean values to a byte array and vice-versa. Let me clarify something at the beginning, by array, you probably mean list in Python. But I cannot understand this. Thus the ability to type it (in case of unchecked user input) creates a vulnerability known as null byte injection and can lead to security exploits. python hex to byte A count of 0 specifies a byte value of 0x90. Python language interpreter has various built-in functions for different types of tasks and manipulation. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created. Whenever I want to check string length / byte count, I just enter len some string in my address bar. Unlike compiled languages that have to be specifically compiled for each different type of computers, a Java program only needs to be converted to byte code once, after which it can run on any platform for which a Java Virtual Machine exists. Base64 encode your data in a hassle-free way, or decode it into human-readable format. The join function allows to join the hexadecimal result into a string. The example converts the packed value to a sequence of hex bytes for printing with binascii. Python 3 output:. png image file to embedded C/C++ code style array or string: {HEX: \x. The ability to represent a null character does not always mean the resulting string will be correctly interpreted, as many programs will consider the null to be the end of the string. I am looking for a way to convert a long string (from a dump), that represents hex values into a byte array. We should get equal size of ASCII value byte array and hex value byte array. If this instance is null or an empty string (""), the returned array is empty and has a zero length. For example, the character array {' \x63 ', ' \x61 ', ' \x74 ', ' \0 '} is an NTBS holding the string "cat" in ASCII encoding. However, I don't think I stated clearly what I needed. Take a C printf()-style format string and a variable number of arguments, calculate the size of the resulting Python bytes object and return a bytes object with the values formatted into it. an iterable, it must be an iterable of integers in the range 0-256, which are used to initialize the array. Here is an example:. , so I know a lot of things but not a lot about one thing. X's str and unicode types have morphed into 3. First we make a Java program which is going to input an image and then convert it into byte array and then. Ok, having cleared that, getting the the size of a list or tuple (or array, if you will), is pretty straighforward. Also, it doesn't match the byte type of the function; crc is a byte[] or byte*. And sometimes you'll have source code written in other programming languages that contain the equivalent of Byte[] arrays which you want to extract and convert into something more PowerShell-malleable, which is not hard if you paste that code into a here-string in your shell and then convert that string into a Byte[] array. The resulting string is therefore twice as long as the length of data. Generally, I'm dealing with a byte stream that I want to output as a string of hex. The string representation uses base32 hex (without padding) for better space efficiency when stored in that form (20 bytes). This function is added to the built-in namespace by the site module. decode codecs, and have tried other possible functions of least astonishment without. Converting byte array to String in Java. The bytes object can be produced in either 'C' or 'Fortran', or 'Any' order (the default is 'C'-order). You may have to register or Login before you can post: click the register link above to proceed. Though, once I have the actual byte values in an array I would know what to do. ) Size of the data (how many bytes is in e. toString(int, redix) where int is byte to be converted and redix is 16 for hexadecimal format. Thus, the 4 byte array "1234" would be converted to the 2 byte array // // 0x12,0x34. Convert a hexadecimaly encoded text into an decoded string or download as a file using this free online hex to text decoder utility. a2b_hex (hexstr) ¶ binascii. I am a Java novice and ended up using BigInteger and watching out for leading hex zeros. com my_byte_array is a byte array variable. Also remember to define the class before calling unserialize(). The Hex Byte values may or may not be space separated. source (Optional) - source to initialize the array of bytes. (ByteArray)和16进制. TAG_Byte_Array A length-prefixed array of signed bytes. Code #1: If a string, must provided encoding and errors parameters, bytearray() converts the string to bytes using str. Do you have an example of what input will translate to what output?-Peter. It is a small code that you create for a project, combierte small chains hex to bytes that return by a list of corresponding bytes. tobytes (order='C') ¶ Construct Python bytes containing the raw data bytes in the array. Conversion problems. The bytes type behaves almost as a string or a list, and is really practical to deal with binary files. Guessed on your output image it's a charset problem. Here, we will learn how to copy complete structure into a character array (byte array) in C programming language? Such kind of requirement may occur many times, when you want to write a complete buffer into the memory or keep the data save into a character buffer. Unlike compiled languages that have to be specifically compiled for each different type of computers, a Java program only needs to be converted to byte code once, after which it can run on any platform for which a Java Virtual Machine exists. An image is essentially a file. Use unpack() to extract data from its packed representation. chr(i)¶ Return the string representing a character whose Unicode codepoint is the integer i. You can get the value of a single byte by using an index like an array, but the values can not be modified. The base64, base32, and base16 encodings convert 8 bit bytes to values with 6, 5, or 4 bits of useful data per byte, allowing non-ASCII bytes to be encoded as ASCII characters for transmission over protocols that require plain ASCII, such as SMTP. Simple, elegant and efficient - what is it that makes developers go for the most complex solutions when you can do something like this. Ways to construct a byte array using the bytearray function: 1) Using a string as a source for the bytearray: A string is nothing but a collection of characters and each character of the string is represented by a numeric value. Base64 encode your data in a hassle-free way, or decode it into human-readable format. Online tool for hex decoding a string. I wish to convert this Hex String into a byte array so that I can shift each value out and convert it into its proper. hex() function is one of the built-in functions in Python3, which is used to convert an integer number into it's corresponding hexadecimal form. How to initialise array elements with hexadecimal values in c programming language, here is the program in which I am declaring an array by initialising elements with one byte hexadecimal values. Built-in Functions¶¶. This form allows you to generate random bytes. bitstring is a pure Python module designed to help make the creation and analysis of binary data as simple and natural as possible. The hex characters are then stored as the two byte string representation of the characters. Sign in Sign up. This is only showing you what is in index 0, and not the full array (use a for loop), also the result you are seeing is the character based on value in index 0. It is useful when optimizing certain methods. There's a big difference between the hex string "0x0" and the null byte "\x0". If you use some library like pillow to load the jpeg then you'll get back an Image object instead of the bytes. string aString = " 10"; byte aByte = (byte)Integer. Every byte of data is converted into the corresponding 2-digit hex representation. Online tool for hex decoding a string. On Python 3. However, there are many differences in strings and Byte objects. We need to prepare hex string before could convert hex to a byte array and vice versa, and I noticed many forum create a small function to do the conversion from string to hex and convert a string to byte. Python has provided library to handle bit maniputation in most cases, however, I can not find a good way to convert a 8-bit single byte to signed int type using built-in lib. Paste a string, get a hexadecimal. You can pick an encoding for the strings to encode and decode in; the default is utf-8. String to byte array. Here we will take an integer value in hexadecimal format and then extract all 4 bytes in different four variables. Hi, I looked thru modules binascii and struct but not found a way to convert hexadecimal value to a string of hex values according to ascii table. Return Value: This method returns a string of hexadecimal pairs separated by hyphens, where each pair represents the corresponding element in value. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created. chr(i)¶ Return the string representing a character whose Unicode codepoint is the integer i. String inputString = "this is input String"; System. Java Code import org. x has two types that can be used to store a string: str: raw byte data; each element represents a single byte, which can range in value from 0-255. for example: '707974686f6e2d666f72756d2e696f' -> 'python-forum. This module performs conversions between Python values and C structs represented as Python strings. encode() is used to turn a Unicode string into a regular string, and. To extract hex data. The formatting of the individual hex_byte is similar to an sprintf in C. Often, some kind of separator is used to make the encoded data easier for human reading. Convert a String to int: 2. The Bytes Type. msg (outlook mail) to pdf using java 1 day ago. array of n elements into a hex string? For e. Edit: I think there is a problem with my program design. An object of type Byte contains a single field whose type is byte. Split(' ') method when you have a string which represents bytes separated by spaces such as "33 47 82". And I want to convert it to a 4 byte hexadecimal value. When you read any kind of file from a hard disk you get back an array of bytes, whether that data be a jpeg image or some text or anything. toString() 2. String inputString = "this is input String"; System. define a macro HEXTOBYTE that uses HEXTONIBBLE to get a byte from a hex initialize your array with HEXTOBYTE parameterized correctrly If your KEY is not in form of a string, i. Hi, I looked thru modules binascii and struct but not found a way to convert hexadecimal value to a string of hex values according to ascii table. hex string to byte array, C. hex() function is one of the built-in functions in Python3, which is used to convert an integer number into it's corresponding hexadecimal form. The string is written in a simple template language: characters are usually copied literally into the function's output, but format specifiers, which start with a % character, indicate the location and method to translate a piece of data (such. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Convert bytes to int or int to bytes in. There's a big difference between the hex string "0x0" and the null byte "\x0". Python Bytes, Bytearray: Learn Bytes literals, bytes() and bytearray() functions, create a bytes object in Python, convert bytes to string, convert hex string to bytes, numeric code representing a character of a bytes object in Python, define a mapping table characters for use with a bytes object in Python, convert bytes to hex in Python, how to get the character from the numeric code in bytes. C# Convert String to Byte Array This C# article converts a string to a byte array. Load the first byte of a binary integer loadBinInt1() Load the second byte of a binary integer loadBinInt2() Load a binary PUT loadBinPut() Load a binary string loadBinString() Load binary unicode sequence loadBinUnicode() Load an associative array (Python dictionary) loadDict() Load an empty list sequence loadEmptyList() Load a float value. Hex strings generally have a "0x" prefix. C/C++ function to Convert Hex String to Decimal Number May 7, 2014 No Comments c / c++ , code , code library , programming languages , tricks In C/C++ header file stdlib. If you are about to ask a "how do I do this in python" question, please try r/learnpython, the Python discord, or the #python IRC channel on FreeNode. Byte to Hex-String Conversion If this is your first visit, be sure to check out the FAQ by clicking the link above. Python Research Centre. Python bytes, bytearray Examples (memoryview) Use the bytes, bytearray and memoryview types. byteorder ) returns a hex string in capital letters. August 21, 2019 Can anyone identify this encoding? Im working on a program to interface with some hardware that is sending data that has been encoded and wrapped to send within a CDATA block in an XML document. The only gotcha's with this method is if your object member names or values may somehow contain the odd "~~NULL_BYTE~~" string. We need to prepare hex string before could convert hex to a byte array and vice versa, and I noticed many forum create a small function to do the conversion from string to hex and convert a string to byte. Parameters specify the subset as an offset in the input array, the number of elements in the array to convert, and whether to insert line breaks in the return value. It is easy for humans to read and write. In Python 2, the maketrans function is in the module string instead of str. The routine returns the decompressed data, unless data input data ends in an orphaned repeat indicator, in which case the Incomplete exception is raised. Bytes objects can also be created with literals, see String and Bytes literals. activestate. The returned bytes object is therefore twice as long as the length of data. We use %02X to print two places (02) of Hexadecimal (X) value and store it in the string st. In Python 2, both str and bytes are the same typeByte objects whereas in Python 3 Byte objects, defined in Python 3 are “sequence of bytes” and similar to “unicode” objects from Python 2. python str byte hex. zfill is used to fill the left zero if the number is smaller than 128. An image is essentially a file. map(function(byte) { return (byte & 0xFF). And the converted byte array can be used to get back the original image. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created. I was unable to find any built in method for doing this. Decodes Hex data into octects: 2. The following should read a hex string such as "ece998a2fb" into vector 236 233 152 162 251. Single-byte members of a vector are displayed as an integer array. The join function allows to join the hexadecimal result into a string. In CodeSpeedy I always try to give you the best and easy solution to any coding problem. In the above program, we have a byte array named bytes. In this example, the format specifier calls for an integer or long value, a two character string, and a floating point number. One header value is the Date, and it's represented as follows (in hex): 85 04 57 E2 A2 49 0x85 is the "Date" header, 0x04 is the data length (4 bytes) and the 4 following bytes represent the date (timestamp). b'\xFE\xFF' another more flexible way is to have hex function accept a format. 3: public String toString() Converts the buffer content into a string. unhexlify(). possdibly because you are working on python 3 and I am on 2. public static string ByteArrayToString(byte[] byteArray) { var hex = new StringBuilder(byteArray. Meet Base64 Decode and Encode, a simple online tool that does exactly what it says; decodes Base64 encoding and encodes into it quickly and easily. Converting from a Byte array in ANSI format to a string the japanese characters should be converted to hex representation of its value while english characters. When you print a byte string, Python prefers to display it using ASCII characters where possible regardless of whether it was constructed from backslash escapes or not. Python is a high-level language that was not designed for memory-level operations, so it does lack some of the bit- and byte-level manipulation tools and types that would be helpful when working with OptoMMP. If source is iterable, such as list, it must be an iterable of integers in the range 0 <= x < 256, which are used as the initial contents of the array. Average numbers in array in C Programming; Add minimum number to an array so that the sum becomes even in C programming; Will a finally block execute after a return statement in a method in Java? C program to find the length of a string? C Program to Check if a Given String is a Palindrome? Concatenate a string given number of times in C++. python documentation: encode/decode to hex no longer available. Byte to Hex-String Conversion If this is your first visit, be sure to check out the FAQ by clicking the link above. The text features of str gain the features from the Unicode String class, unicode. convert them to four bit nibbles ] NIBBLES=: (2 2 ^ 4) #: RANDOM_BYTES 14 4 14 3 11 7 15 15 7 10. Codespeedy. encoding (Optional) - if source is a string, the encoding of the string. Convert Hex String to byte Array in Java Java 8 Object Oriented Programming Programming To convert hex string to byte array, you need to first get the length of the given string and include it while creating a new byte array. Patch provided by Shane StClair (Axiom Data Science) References #3750 for trunk PostGIS 2. Net, every string has a character set and encoding. toString(int, redix) where int is byte to be converted and redix is 16 for hexadecimal format. Purpose: The base64 module contains functions for translating binary data into a subset of ASCII suitable for transmission using plaintext protocols. Here we will take an integer value in hexadecimal format and then extract all 4 bytes in different four variables. Ways to construct a byte array using the bytearray function: 1) Using a string as a source for the bytearray: A string is nothing but a collection of characters and each character of the string is represented by a numeric value.