Re: Issue destroying image using perl/TK

[lamprecht]

my $fn =@_;

does not do what you think it does

Cheers, Christoph

[AnomalousMonk]

Specifically,
    my $fn = @_;
initializes  $fn with the number of elements in the  @_ array (array evaluated in scalar context). What is almost certainly wanted is
    my ($fn) = @_;
or better yet
    my $fn = shift;
to initialize  $fn with the first element (index 0) of the array, Update: which, in this case, is an object reference by which an object method is called.

[nikwasi]

This did the trick. Thanks

@_ is the list of incoming parameters to a subroutine. What is the significants of () around the scaler pv?

[lamprecht]

() make the left hand side a list. Arrays return their elements when evaluated in list context.

See also perldata :

Assignment is a little bit special in that it uses its left argument t
+o determine the context for the right argument. Assignment to a scala
+r evaluates the right-hand side in scalar context, while assignment t
+o an array or hash evaluates the righthand side in list context. Assi
+gnment to a list (or slice, which is just a list anyway) also evaluat
+es the righthand side in list context.


Cheers, Christoph