my $oExcel = new Spreadsheet::XLSX ;
my $oBook = $oExcel->Parse( $filename) ;

##</code><code>##

my $oBook = Spreadsheet::XLSX->new($filename);

##</code><code>##

sub xls2csv {
   my ($filename, $regions, $rotate) = @_ ;
   my $sheet = 0 ;
   my $output = "" ;   
   
   # extract any sheet number from the region string
   $regions =~ m/^(\d+)-(.*)/ ;

   if( $2) {
      $sheet = $1 - 1 ;
      $regions = $2 ;
    }

    # now extract the start and end regions
    $regions =~ m/(.*):(.*)/ ;

    if( !$1 || !$2) {
        print STDERR "Bad Params";
        return "" ;
    }

   my @start = sheetRef( $1) ;
   my @end = sheetRef( $2) ;
   if( !@start) {
        print STDERR "Bad coordinates - $1";
        return "" ;
   }
   if( !@end) {
        print STDERR "Bad coordinates - $2";
        return "" ;
   }
   
   if( $start[1] > $end[1]) {
        print STDERR "Bad COLUMN ordering\n";
        print STDERR "Start column " . int2col($start[1]);
        print STDERR " after end column " . int2col($end[1]) . "\n";
        return "" ;
   }
   if( $start[0] > $end[0]) {
        print STDERR "Bad ROW ordering\n";
        print STDERR "Start row " . ($start[0] + 1);
        print STDERR " after end row " . ($end[0] + 1) . "\n";
        exit ;
   }
   
   # start the excel object now
my $oBook = Spreadsheet::XLSX -> new($filename);
# my $oExcel = new Spreadsheet::XLSX ;
 #  my $oBook = $oExcel->Parse( $filename) ;
   # open the sheet
   my $oWkS = $oBook->{Worksheet}[$sheet] ;
   # now check that the region exists in the file
   # if not trucate to the possible region
   # output a warning msg
   if( $start[1] < 0) {
        print STDERR int2col( $start[1]) . " < min col " . int2col(0) . " Resetting\n";
        $start[1] = 0 ;
   }
   if( $end[1] > 701) {
        print STDERR int2col( $end[1]) . " > max col " . int2col(701) . " Resetting\n" ;
        $end[1] = 701 ;
   }
   if( $start[0] < 0) {
        print STDERR "" . ($start[0] + 1) . " < min row " . (0 + 1) . " Resetting\n";
        $start[0] = 0 ;
   }
   if( $end[0] > 1048575) {
        print STDERR "" . ($end[0] + 1) . " > max row " . (1048575 + 1) . " Resetting\n";
        $end[0] = 1048575 ;
      }

   my $x1 = $start[1] ;
   my $y1 = $start[0] ;
   my $x2 = $end[1] ;
   my $y2 = $end[0] ;

    if( !$rotate) {       
    for( my $y = $y1 ; $y <= $y2 ; $y++) {
       for( my $x = $x1 ; $x <= $x2 ; $x++) {
          my $cell = $oWkS->{Cells}[$y][$x] ;
          $output .=  $cell->Value if(defined $cell);
          $output .= "," if( $x != $x2) ;
       }
       $output .= "\n" ;
    }
     } else {
    for( my $x = $x1 ; $x <= $x2 ; $x++) {
       for( my $y = $y1 ; $y <= $y2 ; $y++) {
          my $cell = $oWkS->{Cells}[$y][$x] ;
          $output .=  $cell->Value if(defined $cell);
          $output .= "," if( $y != $y2) ;
       }
       $output .= "\n" ;
    }
     }
   
   return $output ;
}