VB.NET

Getting Started Spidering a Site

See more Spider Examples

This is a very simple "getting started" example for spidering a web site. As you'll see in future examples, the Chilkat Spider library can be used to crawl the Web. For now, we'll concentrate on spidering a single site. VB.NET

Dim success As Boolean = 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/")

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

    success = spider.CrawlNext()
    If (success = True) Then
        ' Show the URL of the page just spidered.
        Debug.WriteLine(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
            Debug.WriteLine("No more URLs to spider")
        Else
            Debug.WriteLine(spider.LastErrorText)
        End If

    End If

    ' Sleep 1 second before spidering the next URL.
    spider.SleepMs(1000)
Next