You're not closing your Excel file after writing to it. Add an explicit $workbook->close() before calling get_max_row_col(), and your script will work.

While I'm at it, allow me to suggest doing proper error checking, too. Quoting Spreadsheet::ParseExcel's documentation (emphasis mine):

If an error occurs parse() returns undef. In general, programs should contain a test for failed parsing as follows:

    my $parser   = Spreadsheet::ParseExcel->new();
    my $workbook = $parser->parse('Book1.xls');

    if ( !defined $workbook ) {
        die $parser->error(), ".\n";
    }
[download]

Adding error checking to your code then yields:

No Excel data found in file at 1098852.pl line 32.
[download]

Which might already have given you a clue as to what's going wrong.

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