if (dta_vcr.size() > 0) {
f_name = dta_vcr.at(0);
f_name = W1Util::concat_paths(mon_dr, f_name);
if (dta_vcr.size() > 0) {
f_name = dta_vcr.at(0);
f_name = W1Util::concat_paths(mon_dr, f_name);
if (size > 0) {
f_name = d_vcr.at(size - 1);
f_name = W1Util::concat_paths(mon_dr, f_name);
if (size > 0) {
f_name = d_vcr.at(size - 1);
f_name = W1Util::concat_paths(mon_dr, f_name);