String to ascii hex/int value

Question

I am trying to convert a string to a vector of ASCII value uint8_t

For example, if I have a string that is "500" I would want a vector that is {53, 48, 48} where these values are hex 0x35, 0x30, 0x30. This is what I am currently doing and it is not working

#include <iostream>
#include <string>
#include <vector>
int main() {
    std::string number = "500";
    std::vector<std::uint8_t> bytes;
    for (auto& c : number)
        bytes.push_back(static_cast<std::uint8_t>(c));

    for (auto& c : bytes)
        std::cout << c << std::endl;
    return 0;
}

But I just get 5, 0, 0 as output where I was expecting 53, 48, 48

You haven't written any code that would convert anything to a displayable hex representation. If that's what you want, which isn't clear. — , Apr 30 '19 at 23:00
@NeilButterworth I was just hoping to get the integer value, I will edit the question. — user2840470, Apr 30 '19 at 23:02

score 1 · Answer 1 · edited Apr 30 '19 at 23:28

1

std::cout << c << std::endl; is writing std::uint8_t as a character (see this question for details). You have to cast it to an integer to actually get the result you want.

For example (wandbox link):

std::cout << static_cast<int>(c) << std::endl;

edited Apr 30 '19 at 23:28

Remy Lebeau

555,201
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answered Apr 30 '19 at 23:13

Serikov

1,159
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String to ascii hex/int value

1 Answers1