##
sub chfile
{
.......
my $datafile = "myfile.txt";
my $filename = PerlApp::extract_bound_file($datafile);
die "$datafile not bound to application\n" unless
defined $filename;
my $fh="LEX";
open($fh,'$filename') or die "Can't open $datafile
$filename)\n";
while(){
......
}
}
##
##
Tk:Error:Can't open myfile.txt [\&main::chfile]