Perl printing binary to files - cr lf

Perl printing binary to files - cr lf

Content Index :

Perl printing binary to files - cr lf
Tag : perl , By : Umang
Date : November 28 2020, 01:01 AM

No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

How do I unpack binary files with Perl?

Tag : perl , By : Noah
Date : March 29 2020, 07:55 AM
help you fix your problem I suspect that you are not reading the entire file (the <> operator tries to read a record, using the record seperator $/ which is newline by default). Try changing the read to something like this:
    # Enable slurp mode
    local $/;
    my @values_tmp1 =  unpack("N*", <BIN_FILE1>);
    my @values_tmp2 =  unpack("N*", <BIN_FILE2>);

Binary files printing and desired precision

Tag : file , By : user186435
Date : March 29 2020, 07:55 AM
it helps some times
yes, binary files are more compact, but you lose portability and there are various other potential problems too, so unless your data files are problematically huge, or slow to export/import, it's a good idea to stick with text if you can (you can always compress them for storage, e.g. with zip)
for (i = 0; i < z_size; i++)
    double z = (double)z1[i];
    fwrite(&z, sizeof(double), 1, out);

How to output binary files in Perl?

Tag : perl , By : Ronnie Carlin
Date : March 29 2020, 07:55 AM
I hope this helps . You can use chr(0x41).
For larger structures, you can use pack:
pack('c3', 0x41, 0x42, 0x43) # gives "ABC"

Printing large files using perl CGI

Tag : perl , By : Brian
Date : March 29 2020, 07:55 AM
I wish this help you I need to print text on browser with my perl CGI application, the file i need to print can be of large size 30 - 100MB or more. I have the following code , You mentioned in the comments:
#!/usr/bin/env perl

use strict;
use warnings;

my $CHARS_PER_LINE = 72;
my $text = 'x' x $CHARS_PER_LINE;

for my $i (1 .. 40 * 1024 * 1024 / $CHARS_PER_LINE) {
    print "<br>$text\n";
$ ls -lh ytt.html
-rw-r--r--  1 abc abc    43M Nov 18 13:31 ytt.html

Printing all files in a directory in Perl - will not work

Tag : linux , By : jch
Date : March 29 2020, 07:55 AM
should help you out Here is another place where the very basic troubleshooting step of use strict; and use warnings; has been omitted, and it would have told you exactly what was wrong.
Global symbol "@indir" requires explicit package name (did you forget to declare "my @indir"?)
#!/usr/bin/env perl
use strict;
use warnings;

my $indir = "/usr/bin";

# read in all files from the directory
foreach my $filename ( glob  "$indir/*" ) {
    print "$filename\n";
Related Posts Related QUESTIONS :
  • Is there any way to check whether a file is an empty file using PERL program?
  • Perl Date::Manip detects timezone wrong for EST and EDT
  • Why does the below Perl code show "Use of uninitialized value in concatenation (.) or string" when I try to us
  • How to print part of header and string in another file in Perl
  • Query about how to unpack a packed binary data
  • Can't open perl script "Build.PL": No such file or directory in response to perl Build.PL
  • Is there a way to host a webServer in perl which should in HTTPS
  • How do I concisely check warning categories up to the root of the hierarchy in my package?
  • Use tr with arrays
  • I'm facing problem with the email program in Perl
  • How to install Filter::Crypto module for perl under ubuntu
  • Count tandem repeats in Perl
  • Graph.pm - how to get all paths with particular length?
  • how get the last directory using perl?
  • Perl parsing email body without parts using MIME::Parser
  • Why Perl ignores spaces between a sigil and variable name?
  • Using Perl to replace empty string with space
  • Displaying 12-h time in Perl using DateTime
  • Assign temp file from cgi and read it in .sh
  • why doesn't make -C change $PWD as seen through a scripting language such as Perl?
  • Using Win32::Env perl module, environment variable not setting permanently in windows
  • How to fetch a one table from HTML source file using lwp module?
  • How to process variable dimension array in Perl
  • perl print to a file and STDOUT which is the file
  • Get array in perl from json_encode
  • How to get unicode code points in perl v5.24?
  • using an array as a reference is deprecated in perl
  • Using Perl's File::Basename to rename a file extension
  • Unable to get page via HTTPS with LWP::Simple in Perl
  • Perl DBI case insensitive methods
  • How to resolve @INC related issue in Perl
  • How to do unary and/reduction of bus to a bit in Perl?
  • What does perl -pe "s|$PASSWORD|<PASSWORD>|g"?
  • I want to replace last / by ,
  • Strange regular expression
  • What does "!" mean before a variable in perl
  • Getting the inner hash in Perl
  • perl : can't require $value from other perl file and use it in 3rd perl file
  • perl assign reference to subroutine
  • Troubleshooting Perl CGI app - Can't locate object method "new" via package
  • How can I write a Template.pm filter to generate PNG output from LaTeX source code?
  • Error: Cannot parse function definition from ' hello()' in Mytest.xs, line 9
  • What's the proper way to fork() in FastCGI?
  • How can I use Math::Business::EMA with DBI to calculate exponential moving averages in Perl?
  • How can I print the calling program/module inside a method in Perl?
  • Which module should I use to parse mediawiki text into a Perl data structure?
  • How can I efficiently group a large list of URLs by their host name in Perl?
  • How can I restore STDOUT after redirecting it to a file in a Perl script?
  • How can I parse this configuration file format (allowing comments) in Perl?
  • How To Avoid a Perl script calling an Another Perl Script
  • Perl - Internal File (create and execute)
  • How can I call a PL/Perl function from another PL/Perl function?
  • How can I terminate a system command with alarm in Perl?
  • When should I use a factory to wrap a constructor in Perl?
  • How can I extract sentences with a particular phrase, in Perl?
  • Dequeue an array in perl with thread::queue
  • How do I tell perl to execute a piece of generated Perl code?
  • Why does a positive lookahead lead to captures in my Perl regex?
  • In a digital photo, how can I detect if a mountain is obscured by clouds?
  • How can I pass a hash to a Perl subroutine?
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com