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Seek function not working in perl


Seek function not working in perl

By : user2956868
Date : November 22 2020, 03:03 PM
This might help you You cannot seek on a pipe.
Either use a temporary file or store the data in memory.
code :


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Perl seek function

Perl seek function


By : Praveen Kumar
Date : March 29 2020, 07:55 AM
it helps some times This problem was solved. Thank you very much. , Before we start,
code :
use Fcntl qw( SEEK_SET );

open IN, "<./test.txt";
seek(IN,10,SEEK_SET);
read IN, $temp, 5;

seek(IN,20,SEEK_SET);
close(IN);
         +--------------------------  0: Initially.
         |         +---------------- 10: After seek($fh, 10, SEEK_SET).
         |         |    +----------- 15: After reading "KLMNO".
         |         |    |    +------ 20: After seek($fh, 20, SEEK_SET).
         |         |    |    |
         v         v    v    v     
file:    ABCDEFGHIJKLMNOPQRSTUVWXYZ
indexes: 01234567890123456789012345
         +--------------------------  0: Initially.
         |         +---------------- 10: After seek($fh, 10, SEEK_CUR).
         |         |    +----------- 15: After reading "KLMNO".
         |         |    |         +- 25: After seek($fh, 10, SEEK_CUR).
         |         |    |         |
         v         v    v         v 
file:    ABCDEFGHIJKLMNOPQRSTUVWXYZ
indexes: 01234567890123456789012345
Seek function not working on flowplayer

Seek function not working on flowplayer


By : Marita Plair
Date : March 29 2020, 07:55 AM
this one helps. It does not look like you are calling the seek method in the correct way. When you bind to the ready event it gives you a couple of parameters. The first argument is the jQuery event object and the second provides a handle on the player API.
From the api parameter you should then be able to call seek
code :
flowplayer(function (api, root) {

    api.bind("ready", function (e, api) {
        api.seek(30);
    });
});
Read & Seek in gzip files Perl

Read & Seek in gzip files Perl


By : Lilek
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can only seek in regular files, not in the output of programs or STDIN etc. If you want to do this, you need to add a buffering layer yourself, but note that you might to need to buffer the whole uncompressed file just to be able to seek in it.
Even if you don't gunzip with an external program, but use something like IO::Gzip you will not be able to seek, because the inherent way gzip (and other compressions) work, is that you need to read all the previous data to be able to decompress the data at the current file position. There are ways around it to limit the amount of necessary previous data, but then you would need to specifically prepare your gzip file and it will grow bigger. I'm not aware of any module which implements this currently, but I did a proof-of-concept once so I know it works.
Perl: seek to and read bits, not bytes

Perl: seek to and read bits, not bytes


By : user2325876
Date : March 29 2020, 07:55 AM
I hope this helps . If n is a multiple of m, and m is one of 1, 2, 4, 8, 16, 32, and on some platforms, 64, you can read the whole file into a string and use vec for this.
(Admittedly a fairly constraining case, but a common one.)
code :
discard = n % 8;
startbyte = (n - discard) / 8
bits = m + discard
bytes = int( (bits + 7) / 8 )
seek to startbyte
read bytes into string
@list = split //, unpack "${bits}b", string
splice( @list, 0, $discard ) 
splice( @list, $m, @list )
Perl: How come "seek" is not working

Perl: How come "seek" is not working


By : Asikhia Oziegbe Eseo
Date : March 29 2020, 07:55 AM
Any of those help Files don't have line numbers. They don't even have lines. Files just have bytes. That means you can't just ask the system "What line of the file is at this position?"
But, since you're seeking to the start of the file, all you need is to reset $..
code :
use Fcntl qw( SEEK_SET );

seek($txtfile, 0, SEEK_SET)
   or die("seek: $!\n");

$. = 0;
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