CODEWITHSUNDEEP
c++formatintdata-conversion
prosseek
prosseek

Reputation: 190979

Printing out byte stream in C++

With the help of this site, C++ int to byte array, I have a code to serialize int to byte stream.

The byte stream data from integer value 1234 is '\x00\x00\x04\xd2' in big endian format, and I need to come up with an utility function to display the byte stream. This is my first version.

#include <iostream>
#include <vector>

using namespace std;

std::vector<unsigned char> intToBytes(int value)
{
    std::vector<unsigned char> result;
    result.push_back(value >> 24);
    result.push_back(value >> 16);
    result.push_back(value >>  8);
    result.push_back(value      );
    return result;
}

void print(const std::vector<unsigned char> input)
{
    for (auto val : input)
        cout << val; // <-- 
}

int main(int argc, char *argv[]) {
    std::vector<unsigned char> st(intToBytes(1234));
    print(st);
}

How can I get correct value on the screen both in decimal and hex?

Upvotes: 3

Views: 17660

Answers (1)

nullptr
nullptr

Reputation: 11058

For hex:

for (auto val : input) printf("\\x%.2x", val);

For decimal:

for (auto val : input) printf("%d ", val);

Upvotes: 13

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