最近，我尝试使用 Visual Basic 6 从任何浏览器创建一个用于保存文本文件中所有访问过的URL的程序。我找到了一些 VB.NET 的代码，但我喜欢用 VB6 进行编程。
获取浏览器网址的VB.NET代码
Option Explicit On
Imports System.Text
Imports System.Runtime.InteropServices.Marshal
Module CurrentUrl
#Region " Overview & References "
'Overview:
'Function GetCurrentUrl returns the URL of the selected browser (IE or Chrome; Firefox to be added).
'Most of the code is based on the references listed below, but this function starts with
'the browser's main window handle and returns only 1 URL.
'It also builds a simple "treeview" of the windows up to the target window's classname.
'References:
'http://www.xtremevbtalk.com/archive/index.php/t-129988.html
'http://social.msdn.microsoft.com/forums/en-us/vbgeneral/thread/321D0EAD-CD50-4517-BC43-29190542DCE0
'http://social.msdn.microsoft.com/Forums/en/vbgeneral/thread/02a67f3a-4a26-4d9a-9c67-0fdff1428a66
#End Region
#Region " Declares, Constants, and Variables"
Private Delegate Function EnumProcDelegate(ByVal hwnd As IntPtr, ByVal lParam As IntPtr) As Boolean 'Delegate added
Private Declare Function EnumWindows Lib "user32" (ByVal lpEnumFunc As EnumProcDelegate, ByVal lParam As IntPtr) As Boolean
Private Declare Auto Function GetWindowText Lib "user32" (ByVal hWnd As IntPtr, ByVal lpString As StringBuilder, ByVal nMaxCount As Integer) As Integer
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As IntPtr, ByVal wCmd As IntPtr) As IntPtr
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As IntPtr, ByVal lpClassName As String, ByVal nMaxCount As Integer) As Integer
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As IntPtr, ByVal wMsg As IntPtr, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer
Private Const WM_GETTEXT = &HD
Private Const WM_GETTEXTLENGTH = &HE
Private Const GW_CHILD = 5
Private Const GW_HWNDNEXT = 2
Private Const GW_HWNDFIRST = 0
Private sURL As String 'String that will contain the URL
Private cbWindows As ComboBox 'Treeview"
Private sIndent As String 'Spaces
Private sBrowser As String 'Starting window (IE or Chrome)
Private sClassName As String = "Edit" 'Default
#End Region
Public Function GetCurrentUrl(ByVal hwnd As IntPtr, ByVal browser As String, ByVal classname As String, ByVal combo As ComboBox) As String
sBrowser = browser
sClassName = classname
cbWindows = combo
If cbWindows IsNot Nothing Then
If cbWindows.GetType.Name = "ComboBox" Then
cbWindows.Items.Clear()
Else
cbWindows = Nothing
End If
End If
sURL = ""
sIndent = ""
EnumWindows(AddressOf EnumProc, hwnd) 'hwnd - originally IntPtr.Zero
Return sURL
End Function
' Enumerate the windows
' Find the URL in the browser window
Private Function EnumProc(ByVal hWnd As IntPtr, ByVal lParam As IntPtr) As Boolean
Dim buf As StringBuilder = New StringBuilder(256) 'String * 1024
Dim title As String
Dim length As Integer
' Get the window's title.
length = GetWindowText(hWnd, buf, buf.Capacity)
title = Left(buf.ToString, length)
' See if the title ends with the browser name
Dim s As String = sBrowser
Dim inprivate = sBrowser & " - [InPrivate]" 'IE adds this to the window title
If title <> "" Then
If (Right(title, s.Length) = s) Or (Right(title, inprivate.Length) = inprivate) Then
' This is it. Find the URL information.
sURL = EditInfo(hWnd, cbWindows)
Return False
End If
End If
' Continue searching
Return True
End Function
' If this window is of the Edit class (IE) or Chrome_AutocompleteEditView (Google), return its contents.
' Otherwise search its children for such an object.
Private Function EditInfo(ByVal window_hwnd As IntPtr, ByRef cbWindows As ComboBox) As String
Dim txt As String = ""
Dim buf As String
Dim buflen As Integer
Dim child_hwnd As IntPtr
Dim children() As IntPtr = {}
Dim num_children As Integer
Dim i As Integer
'Get the class name.
buflen = 256
buf = Space(buflen - 1)
buflen = GetClassName(window_hwnd, buf, buflen)
buf = Left(buf, buflen)
'Add an item to the window list combo, indent as required
If cbWindows IsNot Nothing Then
cbWindows.Items.Add(sIndent & buf)
End If
' See if we found an Edit/AutocompleteEditView object.
If buf = sClassName Then
Return WindowText(window_hwnd)
End If
' It's not an Edit/AutocompleteEditView object. Search the children.
' Make a list of the child windows.
num_children = 0
child_hwnd = GetWindow(window_hwnd, GW_CHILD)
While child_hwnd <> 0
num_children = num_children + 1
ReDim Preserve children(0 To num_children) 'was 1 to ..
children(num_children) = child_hwnd
child_hwnd = GetWindow(child_hwnd, GW_HWNDNEXT)
End While
' Get information on the child windows.
sIndent &= " "
For i = 1 To num_children
txt = EditInfo(children(i), cbWindows)
If txt <> "" Then Exit For
Next i
sIndent = Left(sIndent, sIndent.Length - 4)
Return txt
End Function
' ************************************************
' Return the text associated with the window.
' ************************************************
Private Function WindowText(ByVal window_hwnd As IntPtr) As String
Dim txtlen As Integer
Dim txt As String
txt = "" 'WindowText = ""
If window_hwnd = 0 Then Return "" 'Exit Function
'Get the size of the window text
txtlen = SendMessage(window_hwnd, WM_GETTEXTLENGTH, 0, 0)
If txtlen = 0 Then Return "" 'Exit Function
'Extra for terminating char
txtlen = txtlen + 1
'Alloc memory for the buffer that recieves the text
Dim buffer As IntPtr = AllocHGlobal(txtlen)
'Send The WM_GETTEXT Message
txtlen = SendMessage(window_hwnd, WM_GETTEXT, txtlen, buffer) 'byval txt
'Copy the characters from the unmanaged memory to a managed string
txt = PtrToStringAnsi(buffer)
Return Left(txt, txtlen)
End Function
End Module