我的表单上有一个 webbrowser 控件，当我导航到某个页面时，它会打开一个弹出窗口，在当前默认的窗口浏览器中打开该页面，在本例中为 IE。我想访问此页面的源代码。我不想关闭它，我只想抓取 html。谢谢你的帮助。
问问题
1950 次
1 回答
0
编辑：
解决方案：
eWebbrowser.vb：
Imports System
Imports System.Text
Imports System.Windows.Forms
Imports System.ComponentModel
Imports System.Collections.Generic
Imports System.Runtime.InteropServices
Imports System.Security.Permissions
<PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _
<System.Runtime.InteropServices.ComVisibleAttribute(True)> _
Public Class eWebbrowser
Inherits System.Windows.Forms.WebBrowser
#Region " COM Imports Etc..."
<StructLayout(LayoutKind.Sequential)> _
Public Structure OLECMDTEXT
Public cmdtextf As UInt32
Public cwActual As UInt32
Public cwBuf As UInt32
Public rgwz As Char
End Structure
<StructLayout(LayoutKind.Sequential)> _
Public Structure OLECMD
Public cmdID As Long
Public cmdf As UInt64
End Structure
' Interop - IOleCommandTarget (See MSDN - http://support.microsoft.com/?kbid=311288)
<ComImport(), Guid("b722bccb-4e68-101b-a2bc-00aa00404770"), _
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)> _
Public Interface IOleCommandTarget
Sub QueryStatus(ByRef pguidCmdGroup As Guid, ByVal cCmds As UInt32, _
<MarshalAs(UnmanagedType.LPArray, SizeParamIndex:=1)> ByVal prgCmds As OLECMD, _
ByRef pCmdText As OLECMDTEXT)
Sub Exec(ByRef pguidCmdGroup As Guid, ByVal nCmdId As Long, _
ByVal nCmdExecOpt As Long, ByRef pvaIn As Object, _
ByRef pvaOut As Object)
End Interface
Private cmdGUID As New Guid(&HED016940, -17061, _
&H11CF, &HBA, &H4E, &H0, &HC0, &H4F, &HD7, &H8, &H16)
#Region " Commands Enumeration "
'There are a ton of ole commands, we are only using a couple, msdn research will
'allow you to figure out which ones you want to use.
Enum oCommands As Long
Options
Find = 1
ViewSource = 2
'////////////////////////////////////////
ID_FILE_SAVEAS = 32771
ID_FILE_PAGESETUP = 32772
ID_FILE_IMPORTEXPORT = 32774
ID_FILE_PRINTPREVIEW = 32776
ID_FILE_NEWIE = 32779
ID_FILE_NEWMAIL = 32780
PID_FILE_NEWINTERNETCALL = 32781
ID_FILE_ADDTRUST = 32782
ID_FILE_ADDLOCAL = 32783
DLCTL_BGSOUNDS = &H40
DLCTL_DLIMAGES = &H10
DLCTL_DOWNLOADONLY = &H800
DLCTL_FORCEOFFLINE = &H10000000
DLCTL_NO_BEHAVIORS = &H800
DLCTL_NO_CLIENTPULL = &H20000000
DLCTL_NO_DLACTIVEXCTLS = &H400
DLCTL_NO_FRAMEDOWNLOAD = &H1000
DLCTL_NO_JAVA = &H100
DLCTL_NO_METACHARSET = &H10000
DLCTL_NO_RUNACTIVEXCTLS = &H200
DLCTL_NO_SCRIPTS = &H80
'DLCTL_OFFLINE DLCTL_OFFLINEIFNOTCONNECTED
DLCTL_OFFLINEIFNOTCONNECTED = &H80000000
DLCTL_PRAGMA_NO_CACHE = &H4000
DLCTL_RESYNCHRONIZE = &H2000
DLCTL_SILENT = &H40000000
DLCTL_URL_ENCODING_DISABLE_UTF8 = &H20000
DLCTL_URL_ENCODING_ENABLE_UTF8 = &H40000
DLCTL_VIDEOS = &H20
End Enum
#End Region
#End Region
'Just a little easier way to get at it.
Public ReadOnly Property CurrentURL() As String
Get
Return Me.Document.Url.ToString
End Get
End Property
Public Sub New()
MyBase.New()
End Sub
#Region " Dialogs "
Public Sub ShowOpen()
Dim cdlOpen As New OpenFileDialog
Try
cdlOpen.Filter = "HTML Files (*.htm)|*.htm|HTML Files (*.html)|*.html|TextFiles" & _
"(*.txt)|*.txt|Gif Files (*.gif)|*.gif|JPEG Files (*.jpg)|*.jpeg|" & _
"PNG Files (*.png)|*.png|Art Files (*.art)|*.art|AU Fles (*.au)|*.au|" & _
"AIFF Files (*.aif|*.aiff|XBM Files (*.xbm)|*.xbm|All Files (*.*)|*.*"
cdlOpen.Title = " Open File "
cdlOpen.ShowDialog()
If cdlOpen.FileName > Nothing Then
Me.Navigate(cdlOpen.FileName)
End If
Catch ex As Exception
Throw New Exception(ex.Message.ToString)
End Try
End Sub
Public Sub ShowSource()
Dim cmdt As IOleCommandTarget
Dim o As Object = Nothing
Dim oIE As Object = Nothing
Try
cmdt = CType(Me.Document.DomDocument, IOleCommandTarget)
cmdt.Exec(cmdGUID, oCommands.ViewSource, 1, o, o)
Catch ex As Exception
Throw New Exception(ex.Message.ToString, ex.InnerException)
Finally
cmdt = Nothing
End Try
End Sub
Public Sub ShowFindDialog()
Dim cmdt As IOleCommandTarget
Dim o As Object = Nothing
Dim oIE As Object = Nothing
Try
cmdt = CType(Me.Document.DomDocument, IOleCommandTarget)
cmdt.Exec(cmdGUID, oCommands.Find, 0, o, o)
Catch ex As Exception
Throw New Exception(ex.Message.ToString, ex.InnerException)
Finally
cmdt = Nothing
End Try
End Sub
Public Sub AddToFavorites(Optional ByVal strURL As String = "", Optional ByVal strTitle As String = "")
Dim oHelper As Object = Nothing
Try
oHelper = New ShellUIHelper
oHelper.AddFavorite(Me.Document.Url.ToString, Me.DocumentTitle.ToString)
Catch ex As Exception
Throw New Exception(ex.Message.ToString)
End Try
If oHelper IsNot Nothing AndAlso Marshal.IsComObject(oHelper) Then
Marshal.ReleaseComObject(oHelper)
End If
End Sub
Public Sub ShowOrganizeFavorites()
'Organize Favorites
Dim helper As Object = Nothing
Try
helper = New ShellUIHelper()
helper.ShowBrowserUI("OrganizeFavorites", 0)
Finally
If helper IsNot Nothing AndAlso Marshal.IsComObject(helper) Then
Marshal.ReleaseComObject(helper)
End If
End Try
End Sub
Public Sub SendToDesktop()
'Shortcut to desktop
Dim helper As Object = Nothing
Try
helper = New ShellUIHelper()
helper.AddDesktopComponent(Me.Document.Url.ToString, "website")
Finally
If helper IsNot Nothing AndAlso Marshal.IsComObject(helper) Then
Marshal.ReleaseComObject(helper)
End If
End Try
End Sub
''' <summary>
''' This Will launch the internet option dialog.
''' </summary>
''' <remarks></remarks>
Public Sub ShowInternetOptions()
Shell("rundll32.exe shell32.dll,Control_RunDLL inetcpl.cpl,,0", vbNormalFocus)
End Sub
Public Sub ShowPrivacyReport()
Shell("rundll32.exe shell32.dll,Control_RunDLL inetcpl.cpl,,2", vbNormalFocus)
End Sub
#End Region
#Region " Extended "
<ComImport(), _
Guid("34A715A0-6587-11D0-924A-0020AFC7AC4D"), _
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch), _
TypeLibType(TypeLibTypeFlags.FHidden)> _
Public Interface DWebBrowserEvents2
<DispId(250)> _
Sub BeforeNavigate2(<[In](), MarshalAs(UnmanagedType.IDispatch)> ByVal pDisp As Object, _
<InAttribute(), MarshalAs(UnmanagedType.BStr)> ByRef URL As String, _
<InAttribute()> ByRef flags As Object, _
<InAttribute(), MarshalAs(UnmanagedType.BStr)> ByRef targetFrameName As String, _
<InAttribute()> ByRef postdata As Object, _
<InAttribute(), MarshalAs(UnmanagedType.BStr)> ByRef headers As String, _
<InAttribute(), OutAttribute()> ByRef cancel As Boolean)
'Note: Postdata is a SafeArray but for some reason, if I do a proper declaration, the event will not be raised:
'<[In](), MarshalAs(UnmanagedType.SafeArray, safearraysubtype:=VarEnum.VT_UI1)> ByRef postdata() As Byte, _
<DispId(273)> _
Sub NewWindow3(<InAttribute(), MarshalAs(UnmanagedType.IDispatch)> ByVal pDisp As Object, _
<InAttribute(), OutAttribute()> ByRef cancel As Boolean, _
<InAttribute()> ByRef Flags As Object, _
<InAttribute(), MarshalAs(UnmanagedType.BStr)> ByRef UrlContext As String, _
<InAttribute(), MarshalAs(UnmanagedType.BStr)> ByRef Url As String)
End Interface
Public Enum NWMF
NWMF_UNLOADING = &H1&
NWMF_USERINITED = &H2&
NWMF_FIRST_USERINITED = &H4&
NWMF_OVERRIDEKEY = &H8&
NWMF_SHOWHELP = &H10&
NWMF_HTMLDIALOG = &H20&
NWMF_FROMPROXY = &H40&
End Enum
Private cookie As AxHost.ConnectionPointCookie
Private wevents As WebBrowserExtendedEvents
'This method will be called to give you a chance to create your own event sink
Protected Overrides Sub CreateSink()
'MAKE SURE TO CALL THE BASE or the normal events won't fire
MyBase.CreateSink()
wevents = New WebBrowserExtendedEvents(Me)
cookie = New AxHost.ConnectionPointCookie(Me.ActiveXInstance, wevents, GetType(DWebBrowserEvents2))
End Sub
Protected Overrides Sub DetachSink()
If Not cookie Is Nothing Then
cookie.Disconnect()
cookie = Nothing
End If
MyBase.DetachSink()
End Sub
'This new event will fire when the page is navigating
Public Delegate Sub WebBrowserNavigatingExtendedEventHandler(ByVal sender As Object, ByVal e As WebBrowserNavigatingExtendedEventArgs)
Public Event NavigatingExtended As WebBrowserNavigatingExtendedEventHandler
'This event will fire when a new window is about to be opened
Public Delegate Sub WebBrowserNewWindowExtendedEventHandler(ByVal sender As Object, ByVal e As WebBrowserNewWindowExtendedEventArgs)
Public Event NewWindowExtended As WebBrowserNewWindowExtendedEventHandler
Protected Friend Sub OnNavigatingExtended(ByVal Url As String, ByVal Frame As String, ByVal Postdata As Byte(), ByVal Headers As String, ByRef Cancel As Boolean)
Dim e As WebBrowserNavigatingExtendedEventArgs = New WebBrowserNavigatingExtendedEventArgs(Url, Frame, Postdata, Headers)
RaiseEvent NavigatingExtended(Me, e)
Cancel = e.Cancel
End Sub
Protected Friend Sub OnNewWindowExtended(ByVal Url As String, ByRef Cancel As Boolean, ByVal Flags As NWMF, ByVal UrlContext As String)
Dim e As WebBrowserNewWindowExtendedEventArgs = New WebBrowserNewWindowExtendedEventArgs(Url, UrlContext, Flags)
RaiseEvent NewWindowExtended(Me, e)
Cancel = e.Cancel
End Sub
Public Overloads Sub Navigate2(ByVal URL As String)
MyBase.Navigate(URL)
End Sub
#End Region
#Region " Extended Event Classes "
'This class will capture events from the WebBrowser
Friend Class WebBrowserExtendedEvents
Inherits System.Runtime.InteropServices.StandardOleMarshalObject
Implements DWebBrowserEvents2
Private m_Browser As eWebbrowser
Public Sub New(ByVal browser As eWebbrowser)
m_Browser = browser
End Sub
'Implement whichever events you wish
Public Sub BeforeNavigate2(ByVal pDisp As Object, ByRef URL As String, ByRef flags As Object, ByRef targetFrameName As String, ByRef postData As Object, ByRef headers As String, ByRef cancel As Boolean) Implements DWebBrowserEvents2.BeforeNavigate2
m_Browser.OnNavigatingExtended(URL, targetFrameName, CType(postData, Byte()), headers, cancel)
End Sub
Public Sub NewWindow3(ByVal pDisp As Object, ByRef Cancel As Boolean, ByRef Flags As Object, ByRef UrlContext As String, ByRef Url As String) Implements DWebBrowserEvents2.NewWindow3
m_Browser.OnNewWindowExtended(Url, Cancel, CType(Flags, NWMF), UrlContext)
End Sub
End Class
Public Class WebBrowserNewWindowExtendedEventArgs
Inherits CancelEventArgs
Private m_Url As String
Private m_UrlContext As String
Private m_Flags As NWMF
Public ReadOnly Property Url() As String
Get
Return m_Url
End Get
End Property
Public ReadOnly Property UrlContext() As String
Get
Return m_UrlContext
End Get
End Property
Public ReadOnly Property Flags() As NWMF
Get
Return m_Flags
End Get
End Property
Public Sub New(ByVal url As String, ByVal urlcontext As String, ByVal flags As NWMF)
m_Url = url
m_UrlContext = urlcontext
m_Flags = flags
End Sub
End Class
'First define a new EventArgs class to contain the newly exposed data
Public Class WebBrowserNavigatingExtendedEventArgs
Inherits CancelEventArgs
Private m_Url As String
Private m_Frame As String
Private m_Postdata() As Byte
Private m_Headers As String
Public ReadOnly Property Url() As String
Get
Return m_Url
End Get
End Property
Public ReadOnly Property Frame() As String
Get
Return m_Frame
End Get
End Property
Public ReadOnly Property Headers() As String
Get
Return m_Headers
End Get
End Property
Public ReadOnly Property Postdata() As String
Get
Return PostdataToString(m_Postdata)
End Get
End Property
Public ReadOnly Property PostdataByte() As Byte()
Get
Return m_Postdata
End Get
End Property
Public Sub New(ByVal url As String, ByVal frame As String, ByVal postdata As Byte(), ByVal headers As String)
m_Url = url
m_Frame = frame
m_Postdata = postdata
m_Headers = headers
End Sub
Private Function PostdataToString(ByVal p() As Byte) As String
'not sexy but it works...
Dim tabpd() As Byte, bstop As Boolean = False, stmp As String = "", i As Integer = 0
tabpd = p
If tabpd Is Nothing OrElse tabpd.Length = 0 Then
Return ""
Else
For i = 0 To tabpd.Length - 1
stmp += ChrW(tabpd(i))
Next
stmp = Replace(stmp, ChrW(13), "")
stmp = Replace(stmp, ChrW(10), "")
stmp = Replace(stmp, ChrW(0), "")
End If
If stmp = Nothing Then
Return ""
Else
Return stmp
End If
End Function
End Class
#End Region
<ComImport(), Guid("64AB4BB7-111E-11D1-8F79-00C04FC2FBE1")> _
Public Class ShellUIHelper
'
End Class
End Class
表单加载：
Public WithEvents wb As eWebbrowser
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim brws As New eWebbrowser
wb = brws
End Sub
事件：
Private Sub wb_NewWindow(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles wb.NewWindow
e.Cancel = True
End Sub
新事件：
Private Sub wb_NewWindowExtended(ByVal sender As Object, ByVal e As eWebbrowser.WebBrowserNewWindowExtendedEventArgs) Handles wb.NewWindowExtended
e.Cancel = True
Dim url As String = e.Url
msgbox(url) //This Is The Url!!
End Sub
于 2012-11-01T18:20:15.040 回答