string askForFilename(string defFilename) {
    WINDOW* dialog;
    FORM* form;
    FIELD* fields[2];
    int key = 0;

    //creating a form
    fields[0] = new_field(1, 26, 0, 0, 0, 0);
    fields[1] = 0;
    set_field_buffer(fields[0], 0, defFilename.c_str());

    //options
    form = new_form(fields);
    set_field_back(fields[0], A_UNDERLINE);
    //field_opts_off(fields[0], O_STATIC);
    set_max_field(fields[0], 26);

    //creating a window
    dialog = newwin(5, 30, 8, 25);
    mvwaddstr(dialog, 1, 6, "Podaj nazwe pliku:");
    keypad(dialog, true);
    box(dialog, 0 , 0);
    wrefresh(dialog);

    //binding
    set_form_win(form, dialog);
    set_form_sub(form, derwin(dialog, 1, 26, 3, 2));

    //running a form…
    post_form(form);

    //…and driving it
    while (key != 10) {
        wrefresh(dialog);

        key = wgetch(dialog);

        switch(key) {
            case KEY_LEFT: {
                form_driver(form, REQ_PREV_CHAR);
                break;
            } case KEY_RIGHT: {
                form_driver(form, REQ_NEXT_CHAR);
                break;
            } case KEY_BACKSPACE: {
                form_driver(form, REQ_DEL_PREV);
                break;
            } case KEY_DC: {
                form_driver(form, REQ_DEL_CHAR);
                break;
            } default: {
                form_driver(form, key);
            }
        }
    }

    //saving a value
    defFilename = stripSpace(field_buffer(fields[0], 0));

    //destroying window and form
    unpost_form(form);
    free_form(form);
    free_field(fields[0]);
    wclear(dialog);
    wrefresh(dialog);
    delwin(dialog);
    refresh();

    return defFilename;
}