Convert an ASCII std::string to hex

Question

is there an easy way to convert an ASCII std::string to HEX? I don\'t want to convert it to a number, I only want to convert each ASCII character to it\'s HEX value. The out

Answer 1

If you don't care about the 0x it's easy to do using std::copy:

#include <algorithm>
#include <sstream>
#include <iostream>
#include <iterator>
#include <iomanip>

namespace {
   const std::string test="hello world";
}

int main() {
   std::ostringstream result;
   result << std::setw(2) << std::setfill('0') << std::hex << std::uppercase;
   std::copy(test.begin(), test.end(), std::ostream_iterator<unsigned int>(result, " "));
   std::cout << test << ":" << result.str() << std::endl;
}

Answer 2

This answer to another question does what you want, I think. You'd have to add a " " as separator argument for the ostream_iterator to get whitespaces between the characters.