Xojo Plugin

Avoid URLs Matching Any of a Set of Patterns

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Demonstrates how to use "avoid patterns" to prevent spidering any URL that matches a wildcarded pattern. This example avoids URLs containing the substrings "java", "python", or "perl". Xojo Plugin

Dim success As Boolean
success = False

Dim spider As New Chilkat.Spider

// The spider object crawls a single web site at a time.  As you'll see
// in later examples, you can collect outbound links and use them to 
// crawl the web.  For now, we'll simply spider 10 pages of chilkatsoft.com
spider.Initialize "www.chilkatsoft.com"

// Add the 1st URL:
spider.AddUnspidered "http://www.chilkatsoft.com/"

// Avoid URLs matching these patterns:
spider.AddAvoidPattern "*java*"
spider.AddAvoidPattern "*python*"
spider.AddAvoidPattern "*perl*"

// Begin crawling the site by calling CrawlNext repeatedly.
Dim i As Int32
For i = 0 To 9

    success = spider.CrawlNext()
    If (success = True) Then
        // Show the URL of the page just spidered.
        System.DebugLog(spider.LastUrl)
        // The HTML is available in the LastHtml property
    Else
        // Did we get an error or are there no more URLs to crawl?
        If (spider.NumUnspidered = 0) Then
            System.DebugLog("No more URLs to spider")
        Else
            System.DebugLog(spider.LastErrorText)
        End If

    End If

    // Sleep 1 second before spidering the next URL.
    spider.SleepMs 1000
Next