c++ - Random characters in stringstream -

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i'm writing program searches files. block of code writes folder name stringstream, preceding "./" can used change directory. changes directory , informs user of change.

stringstream maindir; maindir << "./" << crntmainfile; maindir.str().copy(maindirectory, 260, 0); _chdir(maindirectory); std::cout << maindirectory; std::cout << "main directory changed: " << maindirectory << "\n";

my problem maindirectory has bunch of characters @ end. i'm assuming has fact it's 260 length array maybe 20 characters in , characters whatever happens occupying unwritten memory. if problem, how fix it?

edit: i've determined crntmainfile null terminated, terminator lost when it's written maindir. what's causing this? << not write null characters stringstreams? how fix it?

edit: solved problem doing maindir.put(0); after maindir << "./" << crntmainfile; manually null terminate string.

std::string::copy not append null character @ end of copied content.

why don't this

maindir << "./" << crntmainfile ; maindir >> maindirectory; maindir.clear();

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