Convert bytes array to Hexadecimal String [duplicate]

Question

Here is a that I write for Print a byte array to hex String , but now I want to save them as std::string and use it later

here is my code

typedef std::vector<unsigned char> bytes;
void printBytes(const bytes &in)
{
    std::vector<unsigned char>::const_iterator from = in.begin();
    std::vector<unsigned char>::const_iterator to = in.end();
    for (; from != to; ++from) printf("%02X", *from);
}

what can I do ?, I want to save it as a string not print(Show) in console window? any idea!

"in C++ there is no function like StringBuilder" - yes, there is. It's called std::ostringstream. — Remy Lebeau
– Remy Lebeau, Commented Feb 25, 2017 at 1:48

Remy Lebeau · Accepted Answer · 2017-05-25 14:09:54Z

3

Use std::ostringstream:

typedef std::vector<unsigned char> bytes;
std::string BytesToStr(const bytes &in)
{
    bytes::const_iterator from = in.cbegin();
    bytes::const_iterator to = in.cend();
    std::ostringstream oss;
    for (; from != to; ++from)
       oss << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(*from);
    return oss.str();
}

edited May 25, 2017 at 14:09

answered Feb 25, 2017 at 1:52

Remy Lebeau

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4 Comments

johnthagen Over a year ago

static_cast<int>() would be more idiomatic in C++ than the C-style cast (int).

johnthagen Over a year ago

If you want to append the 0x to the front, use std::showbase

anc Over a year ago

@phoenix how would you go about converting this string back?

Remy Lebeau Over a year ago

@anc: you can use std::hex and std::setw() with std::istringstream and operator>>

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