passing data from byte array(with zeros) to istringstream(stringstream)

Question

why this code

char magicData [] = { 0x00i8, 0xfdi8, 0xffi8, 0xfci8, 0x00i8,
                      0xf3i8, 0xf4i8, 0xf5i8, 0x00i8};
std::string s;
std::istringstream ss(magicData, sizeof(magicData));
while(std::getline(ss, s))
{
std::cout << s << std::endl;
}

don't produce any output? (using stringstream instead of istringstream doesn't help). As result i expect 2 line of string (without 0x00 at end). How to solve it?

I think, you should check description of `std::istringstream` constructors to start with... — lapk, Nov 13 '13 at 11:19

score 1 · Answer 1 · edited Aug 29 '20 at 10:59

1

std::istringstream doesn't have a constructor that takes an array. You're actually calling the constructor that takes a C-style string and an openmode. All you need for this to work is:

std::istringstream ss(std::string(magic, magic + sizeof(magic)));

edited Aug 29 '20 at 10:59

John Leuenhagen

576
7
23

answered Nov 13 '13 at 12:47

David G

94,763
41
167
253

magicData does not include '\0'. Your answer and OP example will produce UB. – zoska Nov 13 '13 at 12:54
but... `char magicData[] = "line1\n line 2\n";` works => istringstream have this such of constructor – sbel Nov 13 '13 at 13:01

passing data from byte array(with zeros) to istringstream(stringstream)

1 Answers1