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module to go with s1 web grab example
Intersystem Communications example from a Well House Consultants training course
More on Intersystem Communications [link]

This example is described in the following article(s):
   • Perl Socket Programming Examples - [link]

Source code: myweblib.pm Module: P224

# These are the subs to go with the structured progamming
# network client example. In this case, we're writing our
# own socket based code to access a web server; it's a
# demonstation, as you would probably use the LWP module
# for a web server, but on the current course we were talking
# about writing servers to use the customer's own protocol
# and this was just an example.

use Socket;

sub get_connection {

        # Called with a host and port. Sets up a TCP connection.

        ($host,$port) = @_;
        $port ||= 80;
        $iaddr = inet_aton($host);
        $paddr = sockaddr_in($port,$iaddr);
        $proto = getprotobyname("tcp");
        socket (SOCK, PF_INET, SOCK_STREAM, $proto)
                or die ("no free sockets\n");
        connect (SOCK, $paddr)
                or die ("$host not responding\n");
        }

sub do_httpd {

        # Very simple http demonstration using HTTP/1.0
        # So will need extending if you want to call up
        # pages from a virtual server which need 1.1

        print SOCK "GET $_[0] HTTP/1.0\n\n";
        @gotten = <SOCK>;
        }

sub sockbuffer {

        # Turn buffering on and off on the socket

        select SOCK;
        $|= $_[0];
        select STDOUT;
        }

sub getlinks {

        # Look for "href" attributes

        @rs = ();
        foreach $line(@_) {
        if ($line =~ /href="?([^" >]+)/) {
                push @rs,"$1\n";
        }
        }
        return @rs;
        }

1;

Learn about this subject
This module and example are covered on our public Perl Extra course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

Books covering this topic
Yes. We have over 700 books in our library. Books covering Perl are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Intersystem Communications" training module. You'll find a description of the topic and some other closely related examples on the "Intersystem Communications" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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