Xbase++

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". Xbase++

LOCAL nSuccess
LOCAL oSpider
LOCAL i

nSuccess := 0

oSpider := CreateObject("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
oSpider:Initialize("www.chilkatsoft.com")

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

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

//  Begin crawling the site by calling CrawlNext repeatedly.

FOR i := 0 TO 9

    nSuccess := oSpider:CrawlNext()
    IF (nSuccess == 1)
        //  Show the URL of the page just spidered.
        ? oSpider:LastUrl
        //  The HTML is available in the LastHtml property
    ELSE
        //  Did we get an error or are there no more URLs to crawl?
        IF (oSpider:NumUnspidered == 0)
            ? "No more URLs to spider"
        ELSE
            ? oSpider:LastErrorText
        ENDIF

    ENDIF

    //  Sleep 1 second before spidering the next URL.
    oSpider:SleepMs(1000)
NEXT

oSpider:destroy()