Tizen Forums

Please be sure the point of this problem between file open or data reading.

please see the full path in the runtime whether it's correct or not first.

for tip,

you could make the full path simply,

char buf[PATH_MAX];

snprintf(buf, sizeof(buf), "%s/%s", app_get_data_path(), "input.txt");

fyi, about fstream
https://developer.tizen.org/forums/general-support/including-cc-libs
Alexey.