Avoiding Outbound Links Matching Patterns

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The spider accumulates outbound links when crawling. Your program may specify any number of "avoid patterns" to prevent any link matching at least one of the wildcarded patterns from being added.

//  The Chilkat Spider component/library is free.
Chilkat.Spider spider = new Chilkat.Spider();

//  First, we'll get the outbound links for a page in the
//  Google directory.  Then we'll add some avoid patterns
//  and then re-fetch, to see it work...

spider.Initialize("directory.google.com");
spider.AddUnspidered("http://directory.google.com/Top/Recreation/Food/Cheese/");

bool success;
success = spider.CrawlNext();

//  Display the outbound links
int i;
string url;
for (i = 0; i <= spider.NumOutboundLinks - 1; i++) {
    textBox1.Text += spider.GetOutboundLink(i) + "\r\n";
}

//  The output:
//  http://www.cheese.com/
//  http://www.cheesediaries.com/
//  http://www.WisDairy.com/
//  http://www.newenglandcheese.com
//  http://www.ilovecheese.com
//  http://www.cheesefromspain.com
//  http://www.realcaliforniacheese.com/
//  http://www.frencheese.co.uk/
//  http://www.cheesesociety.org/
//  http://www.specialcheese.com/queso.htm
//  http://www.franceway.com/cheese/intro.htm
//  http://www.foodsubs.com/Chesfirm.html
//  http://www.cheeseboard.co.uk/
//  http://www.thecheeseweb.com/
//  http://www.vtcheese.com/
//  http://www.coldbacon.com/cheese.html
//  http://www.norwegiancheeses.co.uk/
//  http://www.reluctantgourmet.com/cheese.htm
//  http://www.lancewood.co.za/
//  http://www.switzerlandcheese.ca
//  http://www.frenchcheese.dk/
//  http://www.dolcevita.com/cuisine/cheese/cheese.htm
//  http://cheeseisland.net/
//  http://www.cheestrings.ca/
//  http://www.dreamcheese.co.uk
//  http://hgic.clemson.edu/factsheets/HGIC3506.htm
//  http://www.epicurious.com/cooking/how_to/food_dictionary/entry?id=1815
//  http://www.mousetrapcheese.co.uk
//  http://taquitos.net/yum/gc.shtml
//  http://www.greek-recipe.com/static/greek-cheese
//  http://www.park.org/Netherlands/pavilions/food_and_markets/cheese/introduction.html
//  http://www.dairyfarmers.org/engl/recipes/4_1.asp
//  http://www.prairieridgecheese.com/wischeesguid.html
//  http://dmoz.org/cgi-bin/add.cgi?where=Recreation/Food/Cheese
//  http://dmoz.org/about.html
//  http://dmoz.org/cgi-bin/apply.cgi?where=Recreation/Food/Cheese

//  Do it again, but this time with avoid patterns.
spider.Initialize("directory.google.com");
spider.AddUnspidered("http://directory.google.com/Top/Recreation/Food/Cheese/");

//  Add some avoid patterns:
spider.AddAvoidOutboundLinkPattern("*dmoz.org*");
spider.AddAvoidOutboundLinkPattern("*?id=*");
spider.AddAvoidOutboundLinkPattern("*.co.uk*");
success = spider.CrawlNext();

textBox1.Text += "-----------------------" + "\r\n";

//  Display the outbound links
for (i = 0; i <= spider.NumOutboundLinks - 1; i++) {
    textBox1.Text += spider.GetOutboundLink(i) + "\r\n";
}

//  Output:
//  http://www.cheese.com/
//  http://www.cheesediaries.com/
//  http://www.WisDairy.com/
//  http://www.newenglandcheese.com
//  http://www.ilovecheese.com
//  http://www.cheesefromspain.com
//  http://www.realcaliforniacheese.com/
//  http://www.cheesesociety.org/
//  http://www.specialcheese.com/queso.htm
//  http://www.franceway.com/cheese/intro.htm
//  http://www.foodsubs.com/Chesfirm.html
//  http://www.thecheeseweb.com/
//  http://www.vtcheese.com/
//  http://www.coldbacon.com/cheese.html
//  http://www.reluctantgourmet.com/cheese.htm
//  http://www.lancewood.co.za/
//  http://www.switzerlandcheese.ca
//  http://www.frenchcheese.dk/
//  http://www.dolcevita.com/cuisine/cheese/cheese.htm
//  http://cheeseisland.net/
//  http://www.cheestrings.ca/
//  http://hgic.clemson.edu/factsheets/HGIC3506.htm
//  http://taquitos.net/yum/gc.shtml
//  http://www.greek-recipe.com/static/greek-cheese
//  http://www.park.org/Netherlands/pavilions/food_and_markets/cheese/introduction.html
//  http://www.dairyfarmers.org/engl/recipes/4_1.asp
//  http://www.prairieridgecheese.com/wischeesguid.html