(Lianja) Avoid URLs Matching Any of a Set of Patterns

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".

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loSpider = createobject("CkSpider")

// 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
loSpider.Initialize("www.chilkatsoft.com")

// Add the 1st URL:
loSpider.AddUnspidered("http://www.chilkatsoft.com/")

// Avoid URLs matching these patterns:
loSpider.AddAvoidPattern("*java*")
loSpider.AddAvoidPattern("*python*")
loSpider.AddAvoidPattern("*perl*")

// Begin crawling the site by calling CrawlNext repeatedly.

for i = 0 to 9

    llSuccess = loSpider.CrawlNext()
    if (llSuccess = .T.) then
        // Show the URL of the page just spidered.
        ? loSpider.LastUrl
        // The HTML is available in the LastHtml property
    else
        // Did we get an error or are there no more URLs to crawl?
        if (loSpider.NumUnspidered = 0) then
            ? "No more URLs to spider"
        else
            ? loSpider.LastErrorText
        endif

    endif

    // Sleep 1 second before spidering the next URL.
    loSpider.SleepMs(1000)
next


release loSpider