How To Query Google Feed Without Downloading Entire Feed?

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How To Query Google Feed Without Downloading Entire Feed?

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johnywhy
GB - Newbie

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Joined: Dec 2007
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Post: #1

How To Query Google Feed Without Downloading Entire Feed?

is it possible to query a feed for a particular value, without
downloading the entire feed?

specifically, i want to query the following feed for LastBuildDate,
which is in the header of the feed:

http://gdata.youtube.com/feeds/api/playl...results=50

it appears at the bottom of this feed fragment:

<?xml version="1.0" encoding="utf-8" ?>
- <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"
xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005">
- <channel xmlns:cfi="http://www.microsoft.com/schemas/rss/core/2005/
internal" cfi:lastdownloaderror="None">
<link>http://www.youtube.com/view_play_list?p=9A337BB0628CF018</
link>
- <image>
<url>http://www.youtube.com/img/pic_youtubelogo_123x63.gif</url>
<title>Impeach</title>
<link>http://www.youtube.com/view_play_list?p=9A337BB0628CF018</
link>
</image>
<cf:guid isPermaLink="false">http://gdata.youtube.com/feeds/api/
playlists/9A337BB0628CF018</cf:guid>
<atom:updated>2007-12-05T09:45:26Z</atom:updated>
<lastBuildDate>Wed, 05 Dec 2007 09:45:26 GMT</lastBuildDate>

Browser e O.S.:

08-12-2007 11:04 PM

Langy
Administrator

Posts: 8.460
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Joined: Sep 2007
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Post: #2

RE: How To Query Google Feed Without Downloading Entire Feed?

Hi,

u must use this code and customize it with your feed url

Code:

<?php

$insideitem2 = false;

$tag2 = "";

$title2 = "";

$description2 = "";

$link2 = "";

function startElement2($parser2, $name2, $attrs2) {

global $insideitem2, $tag2, $title2, $description2, $link2;

if ($insideitem2) {

$tag2 = $name2;

} elseif (strtolower($name2) == "item") {

$insideitem2 = true;

}

}

function endElement2($parser2, $name2) {

global $insideitem2, $tag2, $title2, $description2, $link2;

if (strtolower($name2) == "item") {

printf("<strong><a href='%s' title='Click to view' target='_blank'>%s</a></strong><div>",

trim($link2),trim($title2),trim($title2));

printf("%s</div><br />",trim($description2));

$title2 = "";

$description2 = "";

$link2 = "";

$insideitem2 = false;

}

}

function characterData2($parser2, $data2) {

global $insideitem2, $tag2, $title2, $description2, $link2;

if ($insideitem2) {

switch (strtolower($tag2)) {

case "title":

$title2 .= $data2;

break;

case "description":

$description2 .= $data2;

break;

case "link":

$link2 .= $data2;

break;

}

}

}

$xml_parser2 = xml_parser_create();

xml_set_element_handler($xml_parser2, "startElement2", "endElement2");

xml_set_character_data_handler($xml_parser2, "characterData2");

$fp2 = fopen("http://feeds.feedburner.com/Googlebig","r")

or die("Error reading RSS data.");

while ($data2 = fread($fp2, 4096))

xml_parse($xml_parser2, $data2, feof($fp2))

or die(sprintf("XML error: %s at line %d",

xml_error_string(xml_get_error_code($xml_parser2)),

xml_get_current_line_number($xml_parser2)));

fclose($fp2);

xml_parser_free($xml_parser2);

?>

u must replace this

Code:

$fp2 = fopen("http://feeds.feedburner.com/Googlebig","r")

with this

Code:

$fp2 = fopen("http://gdata.youtube.com/feeds/api/playlists/9A337BB0628CF018?start-index=1&max-results=50","r")

"There is no patch for human stupidity" - K. D. M.

Browser e O.S.:

09-12-2007 05:54 PM

johnywhy
GB - Newbie

Posts: 3
Group: Registered
Joined: Dec 2007
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Post: #3

RE: How To Query Google Feed Without Downloading Entire Feed?

many thanks, but i've found php5 "get_headers" function. it does the trick.

now my difficult question is "how to call an external PHP file asynchonously WITHOUT shelling out to the system?

i don't have shell access on my shared hosting service, so i cannot use "popen". at least, popen is not working for me here. am i doing something wrong?

PHP Code:

<?php

$myhandle = popen("http://picnictoimpeach.us/remote.php5");

?>

This post was last modified: 09-12-2007 08:43 PM by johnywhy.

Browser e O.S.:

09-12-2007 08:21 PM

Langy
Administrator

Posts: 8.460
Group: Administrators
Joined: Sep 2007
Status: Offline
Reputation: 10

Post: #4

RE: How To Query Google Feed Without Downloading Entire Feed?

ok well,

u can use api feeds of Google in ajax

This is an example:

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

  <head>

    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>

    <title>Google AJAX Feed API - Simple Example</title>

    <script type="text/javascript" src="http://www.google.com/jsapi?key=***YOUR KEY****"></script>

    <script type="text/javascript">

    google.load("feeds", "1");

    function initialize() {

      var feed = new google.feeds.Feed("****FEED RSS****");

      feed.load(function(result) {

        if (!result.error) {

          var container = document.getElementById("feed");

          for (var i = 0; i < result.feed.entries.length; i++) {

            var entry = result.feed.entries[i];

            var div = document.createElement("div");

            div.appendChild(document.createTextNode(entry.title));

            container.appendChild(div);

          }

        }

      });

    }

    google.setOnLoadCallback(initialize);

    </script>

  </head>

  <body>

    <div id="feed"></div>

  </body>

</html>

You must change this with your key:

Code:

<script type="text/javascript" src="http://www.google.com/jsapi?key=***YOUR KEY****"></script>

Go here for generation key page http://code.google.com/apis/ajaxfeeds/signup.html

"There is no patch for human stupidity" - K. D. M.

Browser e O.S.:

09-12-2007 09:22 PM

johnywhy
GB - Newbie

Posts: 3
Group: Registered
Joined: Dec 2007
Status: Offline
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Post: #5

RE: How To Query Google Feed Without Downloading Entire Feed?

sorry to confuse the issue, but i dont need the google api stuff now. i'm using a simple php5 "get_headers". but thanks for the awesome response!

however, if you can tell me what's wrong with my script above, that would be fantastic, but it's off-topic.

This post was last modified: 09-12-2007 09:41 PM by johnywhy.

Browser e O.S.:

09-12-2007 09:40 PM

Langy
Administrator

Posts: 8.460
Group: Administrators
Joined: Sep 2007
Status: Offline
Reputation: 10

Post: #6

RE: How To Query Google Feed Without Downloading Entire Feed?

sorry but i dont use php5

"There is no patch for human stupidity" - K. D. M.

Browser e O.S.:

09-12-2007 10:26 PM

free0
GB - Junior Member

Posts: 24
Group: Registered
Joined: Apr 2010
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Post: #7

RE: How To Query Google Feed Without Downloading Entire Feed?

thank's men ...
we can prove the best ...and mor time ...we can try again
sharing your help and go...

Browser e O.S.:

24-04-2010 10:17 PM

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