Question

How to convert a byte array to a hex string in C++

Answer 1

#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>

std::string byteArrayToHexString(const std::vector<unsigned char>& byteArray) {
    std::ostringstream hexStream;
    
    for (unsigned char byte : byteArray) {
        hexStream << std::uppercase << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(byte);
    }
    
    return hexStream.str();
}

int main() {
    std::vector<unsigned char> byteArray = {0x12, 0xAB, 0x3, 0xCD, 0x56, 0xFF};

    // Convert to hex string
    std::string hexString = byteArrayToHexString(byteArray);

    // Output the result
    std::cout << "Hex String: " << hexString << std::endl;
}


/*
run:

Hex String: 12AB03CD56FF

*/

 

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Answer 2

#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>

std::string byteArrayToHexString(const std::vector<unsigned char>& byteArray) {
    std::ostringstream hexStream;
    
    for (unsigned char byte : byteArray) {
        hexStream << std::uppercase << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(byte);
    }
    
    return hexStream.str();
}

int main() {
    std::vector<unsigned char> byteArray = {3, 10, 7, 15, 12, 255};

    // Convert to hex string
    std::string hexString = byteArrayToHexString(byteArray);

    // Output the result
    std::cout << "Hex String: " << hexString << std::endl;
}


/*
run:

Hex String: 030A070F0CFF

*/

 

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