// Nodename is SV* holding "examplenode"
printf("Nodename=[%s]\n", SvPV_nolen(Nodename)); // output: "Nodename=[examplenode]"

sv_utf8_upgrade(Nodename);

wprintf(L"Got [%s]\n", (wchar_t*)SvPVutf8_nolen(Nodename)); // output: "Nodename=[]"