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You can also pass a valid filehandle to the new() constructor. For example in a CGI program you could do something like this:

binmode(STDOUT);
my $workbook = Spreadsheet::WriteExcel->new(\*STDOUT);
The requirement for binmode() is explained below.

For CGI programs you can also use the special Perl filename '-' which will redirect the output to STDOUT:

my $workbook = Spreadsheet::WriteExcel->new('-');