HTML parsing with VB.Net

Question

Does anybody know of a good way of parsing HTML in VB.Net.

I found a solution somewhere on the net using MSHTML.

I tried using it and to get it to work I had to add some code to my project:

Public Enum HRESULT
    S_OK = 0
    S_FALSE = 1
    E_NOTIMPL = &H80004001
    E_INVALIDARG = &H80070057
    E_NOINTERFACE = &H80004002
    E_FAIL = &H80004005
    E_UNEXPECTED = &H8000FFFF
End Enum

<ComVisible(True), ComImport(), Guid("7FD52380-4E07-101B-AE2D-08002B2EC713"), _
    InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)> _
Public Interface IPersistStreamInit : Inherits IPersist
    Shadows Sub GetClassID(ByRef pClassID As Guid)
    <PreserveSig()> Function IsDirty() As Integer
    <PreserveSig()> Function Load(ByVal pstm As UCOMIStream) As HRESULT
    <PreserveSig()> Function Save(ByVal pstm As UCOMIStream, _
        <MarshalAs(UnmanagedType.Bool)> ByVal fClearDirty As Boolean) As HRESULT
    <PreserveSig()> Function GetSizeMax(<InAttribute(), Out(), _
    MarshalAs(UnmanagedType.U8)> ByRef pcbSize As Long) As HRESULT
    <PreserveSig()> Function InitNew() As HRESULT
End Interface

<ComVisible(True), ComImport(), Guid("0000010c-0000-0000-C000-000000000046"), _
    InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)> _
Public Interface IPersist
    Sub GetClassID(ByRef pClassID As Guid)
End Interface

Declare Function CreateStreamOnHGlobal Lib "ole32" (ByVal hGlobal As IntPtr, ByVal fDeleteOnRelease As Boolean, _
    ByRef ppstm As UCOMIStream) As Long
' Please note that i copied above IPersistStream definition from sp!ke. I owe him a drink ;).

End Class

And now I'm getting obsolete warnings:

Warning 1   'System.Runtime.InteropServices.UCOMIStream' is obsolete: 'Use System.Runtime.InteropServices.ComTypes.IStream instead. http://go.microsoft.com/fwlink/?linkid=14202'.

I didn't like the fact that I had to use the MSHTML stuff (cause I think IE uses it also, and we all know that IE sucks :) ) and that I had to add code the make it work.

Don't want to start a browser-war thread so neglect my last remark. :)

Is there a different (/better) approach of parsing html-pages in VB.Net.

Basically what I'm trying to do is get all the links (<a> tags) and embeds (<object> tag) on a page.

Thanks in advance for all you help!

Chandu · Accepted Answer · 2010-12-25 16:27:30Z

2

You can use HTML Agility Pack

answered Dec 25, 2010 at 16:27

Chandu

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Manish Pansiniya · Accepted Answer · 2010-12-25 16:27:47Z

2

use

Html Agility Pack. Its best one out there. It can be done without browser.

http://htmlagilitypack.codeplex.com/

answered Dec 25, 2010 at 16:27

Manish Pansiniya

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erinus · Accepted Answer · 2010-12-25 16:28:16Z

0

In WinForm App, you can create an object of WebBrowser and let it load page, then you can find any tag name and data by dom node.

answered Dec 25, 2010 at 16:28

erinus

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