Visual FoxPro

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". Visual FoxPro

LOCAL lnSuccess
LOCAL loSpider
LOCAL i

lnSuccess = 0

loSpider = 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
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

    lnSuccess = loSpider.CrawlNext()
    IF (lnSuccess = 1) 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