Question

Is there a better way from hex to char?

char one = static_cast<char>(0x01);

(asking because of this –> C++ using pointers, nothing is passed )

Also is there a fast way to make a char array out of hex values (eg. 0x12345678 to a char array)?

Answer 1

You can try this:

std::string hexify(unsigned int n)
{
  std::string res;

  do
  {
    res += "0123456789ABCDEF"[n % 16];
    n >>= 4;
  } while(n);

  return std::string(res.rbegin(), res.rend());
}

Credits to STL for the “index into char array” trick.

Also beware when printing chars, which are signed on some platforms. If you want 128 to print as 80 rather than FFFFFFFF, you have to prevent it from being treated as -1 by converting to unsigned char first: hexify((unsigned char)(c));