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.
Dim spider As 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/")

Dim success As Boolean
success = spider.CrawlNext()

'  Display the outbound links
Dim i As Long
Dim url As String
For i = 0 To spider.NumOutboundLinks - 1
    TextBox1.Text = TextBox1.Text & spider.GetOutboundLink(i) & vbCrLf
Next

'  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 = TextBox1.Text & "-----------------------" & vbCrLf

'  Display the outbound links
For i = 0 To spider.NumOutboundLinks - 1
    TextBox1.Text = TextBox1.Text & spider.GetOutboundLink(i) & vbCrLf
Next

'  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