From this below script I am able to extract all links of particular website,
But i need to know how I can generate data from extracted links especially like eMail, Phone number if its there
Please help how i will modify the existing script and get the result or if you have full sample script please provide me.
Private Sub btnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGo.Click
'url must be in this format: http://www.example.com/
Dim aList As ArrayList = Spider("http://www.qatarliving.com", 1)
For Each url As String In aList
lstUrls.Items.Add(url)
Next
End Sub
Private Function Spider(ByVal url As String, ByVal depth As Integer) As ArrayList
'aReturn is used to hold the
list of urls
Dim aReturn As New ArrayList
'aStart is used to hold the new urls to be checked
Dim aStart As ArrayList = GrabUrls(url)
'temp array to hold data being passed to new arrays
Dim aTemp As ArrayList
'aNew is used to hold new urls before being passed to aStart
Dim aNew As New ArrayList
'add the first batch of urls
aReturn.AddRange(aStart)
'if depth is 0 then only return 1 page
If depth < 1 Then Return aReturn
'loops through the levels of urls
For i = 1 To depth
'grabs the urls from each url in aStart
For Each tUrl As String In aStart
'grabs the urls and returns non-duplicates
aTemp = GrabUrls(tUrl, aReturn, aNew)
'add the urls to be check to aNew
aNew.AddRange(aTemp)
Next
'swap urls to aStart to be checked
aStart = aNew
'add the urls to the main
list
aReturn.AddRange(aNew)
'clear the temp array
aNew = New ArrayList
Next
Return aReturn
End Function
Private Overloads Function GrabUrls(ByVal url As String) As ArrayList
'will hold the urls to be returned
Dim aReturn As New ArrayList
Try
'regex string used: thanks google
Dim strRegex As String = "<a.*?href=""(.*?)"".*?>(.*?)</a>"
'i used a webclient to get the source
'web requests might be faster
Dim wc As New WebClient
'put the source into a string
Dim strSource As String = wc.DownloadString(url)
Dim HrefRegex As New Regex(strRegex, RegexOptions.IgnoreCase Or RegexOptions.Compiled)
'parse the urls from the source
Dim HrefMatch As Match = HrefRegex.Match(strSource)
'used later to get the base domain without subdirectories or pages
Dim BaseUrl As New Uri(url)
'while there are urls
While HrefMatch.Success = True
'loop through the matches
Dim sUrl As String = HrefMatch.Groups(1).Value
'if it's a page or sub directory with no base url (domain)
If Not sUrl.Contains("http://") AndAlso Not sUrl.Contains("www") Then
'add the domain plus the page
Dim tURi As New Uri(BaseUrl, sUrl)
sUrl = tURi.ToString
End If
'if it's not already in the
list then add it
If Not aReturn.Contains(sUrl) Then aReturn.Add(sUrl)
'go to the next url
HrefMatch = HrefMatch.NextMatch
End While
Catch ex As Exception
'catch ex here. I left it blank while debugging
End Try
Return aReturn
End Function
Private Overloads Function GrabUrls(ByVal url As String, ByRef aReturn As ArrayList, ByRef aNew As ArrayList) As ArrayList
'overloads function to check duplicates in aNew and aReturn
'temp url arraylist
Dim tUrls As ArrayList = GrabUrls(url)
'used to return the
list
Dim tReturn As New ArrayList
'check each item to see if it exists, so not to grab the urls again
For Each item As String In tUrls
If Not aReturn.Contains(item) AndAlso Not aNew.Contains(item) Then
tReturn.Add(item)
End If
Next
Return tReturn
End Function
