As you have it, the scope of the lexical variable my $select_input_file is limited to the sub open_file. A quick hack would be to declare it outside of the sub, so it becomes globally visible.

BTW, using strictures would have warned you that $select_input_file within push_button() is not what you thought it is...

In reply to Re^2: Tcl::Tk getOpenFile Not Working - Missing File Operand by almut
in thread Tcl::Tk getOpenFile Not Working - Missing File Operand by phillc

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