Avoiding Outbound Links Matching Patterns

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.

Download Chilkat Spider ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    SPIDERXLib_TLB,
    SPIDERXLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
spider: TSpider;
success: Integer;
i: Integer;
url: String;

begin
//  The Chilkat Spider component/library is free.
spider := TSpider.Create(Self);

//  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/');

success := spider.CrawlNext();

//  Display the outbound links

for i := 0 to spider.NumOutboundLinks - 1 do
  begin
    Memo1.Lines.Add(spider.GetOutboundLink(i));
  end;

//  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();

Memo1.Lines.Add('-----------------------');

//  Display the outbound links
for i := 0 to spider.NumOutboundLinks - 1 do
  begin
    Memo1.Lines.Add(spider.GetOutboundLink(i));
  end;

//  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

end;