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Ralf Fassel · Guest

I hoped to find this in the FAQ (lite or book), but didn't.

I need to read N chars from an istream into an stringstream for
further line-by-line processing. The N bytes are supposed to be text
lines, but I cannot directly operate on the lines in the istream via
getline(), since the last line might not have a line separator but
runs directly into binary data.

Right now I do (error and stream state checks omitted)
char buffer[buflen];
istream.read(buffer, buflen);
stringstream.str(std::string(buffer, istream.gcount()));
// now we operate via getline() on the stringstream

Is there a better way? Ideally I would like to omit the temporary
string object and read the buflen bytes into the stringstream
directly. I also tried
istream >> noskipws >> setw(buflen) >> stringstream.rdbuf();

but this reads the whole istream, and I did not find a way to limit to
buflen characters. The setw() obviously only takes effect when
reading into char[].

istream.get(streambuf, size) stops at newlines or delimiters, which I
also don't want here.

Thanks
R'

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Gerhard Wesp · Guest

Ralf Fassel <ralfixx (AT) gmx (DOT) de> wrote: