how to i get other web meta tags?

nir987 · August 4th, 2011, 08:57 PM

somebody know how?

i mean that i have textbox and button,and for the example textbox.text=http://google.com and then the press button recall from google the meta tags.. like descrption and title...

August 5th, 2011, 03:00 AM

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Imar · August 5th, 2011, 03:54 AM

Hi there,

You can use the WebRequest class to request the page and then retrieve its HTML. You can then parse the HTML for the requestes meta tags. For that you could use the HTML Agility Pack: http://htmlagilitypack.codeplex.com/

For both techniques you'll find plenty of examples on Google.

Cheers,

Imar

nir987 · August 5th, 2011, 05:12 PM

but how i get the meta with WebRequest?
i found in google alot of thing but icant get the meta tag...

Imar · August 5th, 2011, 06:27 PM

Take a look here: http://www.google.com/#sclient=psy&h...ack++find+meta

The first result is a SO post with sample code, but there are many more examples available.

Cheers,
Imar

nir987 · August 5th, 2011, 09:18 PM

how do i make it work

PHP Code:


			
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load



        Dim doc As New HtmlDocument

        doc.LoadHtml("http://p2p.wrox.com")

        Dim node As HtmlNode = doc.DocumentNode.SelectSingleNode("//meta[@name='description']")







        If node.ToString = Not Nothing Then

            Dim str As String = node.GetAttributeValue("content", "")





        End If



    End Sub

?

Imar · August 6th, 2011, 06:33 AM

Did you read the documentation that comes with the HTML Agility Pack? LoadHtml expects an HTML string, not a Web URL.

As hinted in my first reply, you need to use WebRequest to request the page, grab its HTML and feed that to LoadHtml.

Cheers,

Imar

nir987 · August 6th, 2011, 02:15 PM

PHP Code:


			
       Dim URL As String = "http://www.youtube.com/watch?v=66rY3wHSneA"

        Dim request As WebRequest = WebRequest.Create(URL)

        Dim response1 As WebResponse = request.GetResponse()

        Dim reader As StreamReader = New StreamReader(response1.GetResponseStream())

        Dim str As String = reader.ReadLine()



        Response.Write(str)

its write nothing...so i can grab it to loadhtml..
what could be the problem?
i think this is my last issue

Imar · August 6th, 2011, 02:29 PM

ReadLine works for me with your code and returns the doc type. However, you probably want to use ReadToEnd to grab the full HTML. The following works for me and assigns str the meta tag. Notice I also added some Using statements to ensure objects are cleaned up.

Code:

Dim url As String = "http://www.youtube.com/watch?v=66rY3wHSneA"
Dim request As WebRequest = WebRequest.Create(url)
Using response As WebResponse = request.GetResponse()
  Using reader As StreamReader = New StreamReader(response.GetResponseStream())
    Dim result As String = reader.ReadToEnd()
    Dim doc As New HtmlDocument()
    doc.LoadHtml(result)
    Dim node As HtmlNode = doc.DocumentNode.SelectSingleNode("//meta[@name='description']")
    If node.ToString IsNot Nothing Then
      Dim str As String = node.GetAttributeValue("content", "")
    End If
  End Using
End Using

Hope this helps,

Imar

nir987 · August 6th, 2011, 02:39 PM

thanks alot!!! your more than good book!