Looks like Spreadsheet::BasicRead doesn't have the ability to select sheet by name. But it does allow you to select each sheet by number, and then query its name... so:
sub sheetNames {
my $xlsx = shift;
my %ret;
my $sheet = $xlsx->getFirstSheet;
while ($sheet) {
$ret{$xlsx->currentSheetName} = $xlsx->currentSheetNum;
$sheet = $xlsx->getNextSheet;
}
return %ret;
}
sub selectSheet {
my ($xlsx,$name) = @_;
my %available = sheetNames $xlsx;
$xlsx->setCurrentSheetNum($available{$name});
}
And then before your csv export code runs, do:
selectSheet $ss2, 'My Great Sheet';
Error checking should be added of course, currently it'll just silently fail if the sheet you choose doesn't actually exist.