Make $open a global variable and use it instead of 'datafile.name': 
-command => [ \&get_statistics , $open ]

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Variables are global by default - if you don't understand this just take care never to declare it with 'my' ( don't write "my $open='foo';" just "$open='foo';" ). Set the value for $open with your file selection widget and the bind will call the get_statistics routine with the appropriate value ('value of the $open global variable at the time of the button click') as an argument for you.

In reply to Re^7: Perl tk - How to integrate external scripts by chessgui
in thread Perl tk - How to integrate external scripts by Giorgio C

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