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Read HTML from a website using Webrowser or another method

Posted on 2010-11-23
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Last Modified: 2012-06-27
Hi I have a website that divided into 4 frames. I'm trying to create an application that will constantly run on my PC as a task looking for certain text in the HTML in a frame.

When it finds the text it would alert the user by presenting a pop-up message. This is basically a monitoring website that checking network nodes. Instead of staring at the screen looking for critical messages I would like to be notified when there is an alert.

What would be the best way to set this up?

Thanks
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Question by:rkckjk
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3 Comments
 
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Accepted Solution

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Erick37 earned 500 total points
ID: 34202283
You can navigate the html by loading the page into an HTMLDocument, then get the specific element you are looking for.

The following requires a reference to microsoft.mshtml



Imports mshtml

...

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

		Dim oDoc As New HTMLDocument
		Dim doc As New HTMLDocument
		Dim mElement As mshtml.IHTMLElement
		Dim mECol As mshtml.IHTMLElementCollection

		''must to put some HTML in the DOM before using it
		Dim iDoc2a As IHTMLDocument2 = DirectCast(oDoc, IHTMLDocument2)
		Dim iDoc4 As IHTMLDocument4 = DirectCast(oDoc, IHTMLDocument4)

		iDoc2a.write("<html></html>")
		iDoc2a.close()


		doc = DirectCast(oDoc.createDocumentFromUrl("http://www.google.com", ""), HTMLDocument)

		While doc.readyState <> "complete"
			''Application.DoEvents()
			System.Threading.Thread.Sleep(10)
		End While

		mECol = doc.getElementsByTagName("td")

		For i As Integer = 0 To mECol.length - 1
			mElement = DirectCast(mECol.item(i), IHTMLElement)
			Debug.WriteLine(mElement.tagName & " : " & mElement.innerText)
		Next

	End Sub

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LVL 21

Expert Comment

by:Alpesh Patel
ID: 34205191
Hi,

If you are browsing from internet then best way to create webrequest for the same url and get the pure HTML in response.

In next compare it with your value if match pop up to user.
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Author Comment

by:rkckjk
ID: 34205302
PatelAlpesh, could you show me the code for this?
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