What have I done wrong?
The index is zero based, so if you want to treat the first line in the file as 1st rather than 0th, you need to substract 1 from the number before looking it up in the index: open INDEX, "<:raw","$index" or die "Can't open $index for reading: $!
+";
my $len = -s( INDEX );
sysread INDEX, my( $idx ), $len;
close INDEX;
open FILE, "<$oneper" or die "Can't open $oneper for reading: $!";
foreach my $lineNum (sort {$a cmp $b} keys %todo) {
my $offset = unpack 'N', substr $idx, ( $lineNum - 1 ) * 4, 4; ##
+ Modified!!
print "offset is $offset for linenum $lineNum\n<br>";
seek FILE, $offset, 0;
my $line = <FILE>;
print "found line $line\n";
}
That should do the trick.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|