None of the suggestions have worked, but I found a solution. In my
VRML.pm file, in any subroutine printing output, I added a myprint
argument and where the subroutine originally invoked &printout,
I changed it to invoke \&myprint, where @lines is an array of lines
to be printed:
sub egg { # prints a 3d egg.
my %args=(myprint => \&printout, xaxis => 10, ...);
# Produces lines of wrl output in @lines ...
$myprint=$args{myprint};
&{$myprint}(\@lines);
}
In DrillPressTable.pl, which uses VRML.pm, I added a global $Fh,
and changed the invocation of mystart, and its code, and myprint's
code as well:
my $Fh; # w/b set in mystart.
&mystart($LumberFile,LF);
sub mystart {
my($file,$fh)=@_;
open($fh,"> $file")
|| die("ERROR: Unable to open $file for output");
$Fh=$fh;
my @lines=split(/\n/,<<END);
#VRML V2.0 utf8
NavigationInfo { headlight TRUE }
...
END
&myprint(\@lines);
}
sub myprint {
my($lines)=@_;
foreach my $line (@{$lines}) {
print $Fh "$line\n";
}
}
So now in DrillPressTable.pl I can direct lines of output to
multiple file handles, and I don't need to change any of the 70-odd
perl programs that use my VRML.pm. They'll just take the default
of &printout, which prints to STDOUT, just like before.
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