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Think about Loose Coupling

Stock Quotes

by scribe (Initiate)
on May 24, 2000 at 20:39 UTC ( #14594=sourcecode: print w/replies, xml ) Need Help??
Category: Utility / Web
Author/Contact Info
Description: Retrieves basic stock quotes from yahoo.
Uses IO::Socket to connect to webserver.
Can only retrieve one quote at a time now.

Sample output:
(( ELON 51.625 -3.5625 ) ( 49 -- 56.5 ) ( Vol: 1646200 ))
#!/usr/bin/perl -w
# Steven Rutter <>

use IO::Socket;
use strict;

if ($#ARGV < 0) { die "usage: $0 <symbol>\n" }

my $symbol = $ARGV[0];
my $server = '';
my $serverPort = '80';
my $get = "/d/quotes.cgi?s=$symbol&f=sl1d1t1c1ohgv&e=.csv";

my $remote = new IO::Socket::INET (
                  Reuse=>1 ) or die $!;

$remote -> autoflush(1);

print $remote "GET $get HTTP/1.0\n\n";

my $quote;

while ( my $raw = <$remote>) {

  # "USVOE.OB",2.75,"4/12/2000","4:00PM",-0.3125,3.0625,3.160000,2.656
  # symb, price, lastTrade, lastTradeTime, change, high, low, volume

  if ( $raw =~ /\"/ ) {
    $quote = $raw;

close $remote;

$quote =~ s/\"//g;
$quote =~ s/^M//g;
chomp $quote;
my @qarray = split(/,/, $quote);

print "(( $qarray[0] $qarray[1]  $qarray[4] ) ( $qarray[7] -- $qarray[
+6] ) ( Vol: $qarray[8] ))\n";

Replies are listed 'Best First'.
RE: Stock Quotes
by KM (Priest) on May 24, 2000 at 20:57 UTC
    This wheel has already been invented, very well in fact. Look at Finance::YahooQuote and Finance::QuoteHist and Finance::Quote.


      I'm hesitant to use too many non-standard modules.
      This may be because I am new to this.

      Is it common practice to use all the modules you
      can? I worry about it's portability then - what if the
      system doesn't have the module installed and the
      admins are slow/reluctant to install it?


      plus I had fun ;)
        It is good to have fun and learn. And, have fun learning. One of the reasons I have done Perl all these years is that I always have fun with it, unlike other languages where I didn't find it fun to be using and writing.

        Anyways, don't be hesitant to use modules that aren't part of the distrobution. There is a lot of useful modules out there that will save you time and headaches. To learn, it is always good to read the modules POD and source to see what makes it tick.

        Unless you are using a module which is specific to Win32, or *nix specific, then don't worry about portability. Many modules work fine on many platforms. If you have a reluctant sysadmin, you can still install modules under your home directory. Then you can change @INC to look there, or PERL5LIB.

        In order to allow users to install their own modules I have sometimes aliased 'perl' with 'perl -I/path/to/their/modules' which has worked nicely.

        Hope this helps.


        I wholeheartedly agree with KM. Just for the sake of completeness, I will mention some arguments against using non-standard modules:
        • Learning how to do something yourself may be a worthwhile learning experience.
        • The module that does what you need may include a lot of extra functionality that you are not going to use. In those cases, sometimes it's good to peek under the hood and only extract the functionality you need (giving proper credit, and ideally asking for permission from the author) and putting it directly in your program
        Of course, this only applies to modules that do relatively simple things. If you need to do database access or write a CGI script. By all means, please, use the modules. There's no need to reinvent the wheel, particularly when it's a complex wheel.


Re: Stock Quotes
by mga (Initiate) on Mar 07, 2001 at 20:11 UTC
    hello i downloaded the code and uploaded to my server (haven't modified yet... just testing) and i get the following error: apache: [Wed Mar  7 10:03:33 2001] [error] [client] Premature end of script headers: /u/web/alleat/cgi-local/ can't make the darn thing work... any help will be appreciated
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Node Type: sourcecode [id://14594]
[ambrus]: qQUkZTmHTuKxStGT- BzTIK9gdudif7TkTLI t3mnF144UaAZjkknXY 8nN-QM19wHBsTrp5vB lEYU_Kksa7X1RIBB4x EWLD5X7SW3jGX5ryfN OMn_yL5FTdQxzjhtyX mKN9sjUCzBNHK5Rrp0 S2WMUvIb1i9aZFgjtq VR0GH1bjPMvm1G16iz hBqc1U6toPd4FbJOFj VsOeT745AN1_pO88rD SRAYKtBZwCZedESZmN mvutrOTHiSNwflB- pRfn_k
[Eily]: so far it seems to work
Your Mother reminds the monks they should be grateful not to share an office, lest they be subjugated to constant inanities like, "Czech please!"
[LanX]: what's strange is that the "Cowboy you said this already" message is missing #dqiwd
[LanX]: YM: BTW learn to mute your humanity
[Your Mother]: Cumin? Now I want tacos...
[Eily]: there should be an option in grep for fuzzy order of the letters in the pattern
[Eily]: as in "I might have inverted two, but my eyes misread in the some order as my fingers mistype"

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