webbrowser不能通过webbrowser.hwnd 来获得句柄，上网查询之后在microsoft网站中看到了应该用遍历所以控件并查看其classname是否是shell embedding的方法来获得，而实际装载网页的并不是它本身。webbrowswer的下一层子窗口是Shell DocObject View，再下一层是Internet Explorer_Server，Internet Explorer_Server才是真正装载网页的“窗口”。以下是一个例子：
'画一个webbrowser1和一个command1
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
Private Const GW_CHILD = 5
Private Const GW_HWNDNEXT = 2
Dim hwndWebB As Long
Private Sub Command1_Click()
fGetWebBHwnd Form1.hwnd
End Sub
Private Sub Form_Load()
WebBrowser1.Navigate2 "http://hi.baidu.com/spongeyu"
End Sub
Private Sub WebBrowser1_DownloadComplete()
If hwndWebB = 0 Then
hwndWebB = fGetWebBHwnd(Me.hwnd)
Debug.Print "hwndWebB=" & hwndWebB
End If
End Sub
'获得webbrowser的最上层子控件Internet Explorer_Server的句柄
Public Function fGetWebBHwnd(hwndParent As Long) As Long
Dim hwndChild1 As Long
Dim hwndChild2 As Long
Dim hwndChild3 As Long
Dim classChild1
Dim classChild2
Dim classChild3
Dim sClassname1 As String * 256
Dim sClassname2 As String * 256
Dim sClassname3 As String * 256
'第一子层
hwndChild1 = GetWindow(hwndParent, GW_CHILD)
Debug.Print "hwnd=" & hwndChild1
classChild1 = GetClassName(hwndChild1, sClassname1, 256)
Debug.Print "classsname=" & sClassname1
If Left(sClassname1, Len("Shell Embedding")) <> "Shell Embedding" Then
Do
hwndChild1 = GetWindow(hwndChild1, GW_HWNDNEXT)
Debug.Print "hwnd=" & hwndChild1
classChild1 = GetClassName(hwndChild1, sClassname1, 256)
Debug.Print "classsname=" & sClassname1
If Left(sClassname1, Len("Shell Embedding")) = "Shell Embedding" Then
Exit Do
End If
DoEvents
Loop While hwndChild1 <> 0
End If
'第二子层
If hwndChild1 <> 0 Then
hwndChild2 = GetWindow(hwndChild1, GW_CHILD)
Debug.Print "hwnd=" & hwndChild2
classChild2 = GetClassName(hwndChild2, sClassname2, 256)
Debug.Print "classsname=" & sClassname2
If Left(sClassname2, Len("Shell DocObject View")) <> "Shell DocObject View" Then
Do
hwndChild2 = GetWindow(hwndChild2, GW_HWNDNEXT)
Debug.Print "hwnd=" & hwndChild2
classChild2 = GetClassName(hwndChild2, sClassname2, 256)
Debug.Print "classsname=" & sClassname2
If Left(sClassname2, Len("Shell DocObject View")) = "Shell DocObject View" Then
Exit Do
End If
DoEvents
Loop While hwndChild2 <> 0
End If
End If
'第三子层
If hwndChild2 <> 0 Then
hwndChild3 = GetWindow(hwndChild2, GW_CHILD)
Debug.Print "hwnd=" & hwndChild3
classChild3 = GetClassName(hwndChild3, sClassname3, 256)
Debug.Print "classsname=" & sClassname3
If Left(sClassname3, Len("Internet Explorer_Server")) <> "Internet Explorer_Server" Then
Do
hwndChild3 = GetWindow(hwndChild3, GW_HWNDNEXT)
Debug.Print "hwnd=" & hwndChild3
classChild3 = GetClassName(hwndChild3, sClassname3, 256)
Debug.Print "classsname=" & sClassname3
If Left(sClassname3, Len("Internet Explorer_Server")) = "Internet Explorer_Server" Then
Exit Do
End If
DoEvents
Loop While hwndChild3 <> 0
End If
End If
If hwndChild3 <> 0 Then
fGetWebBHwnd = hwndChild3
Else
fGetWebBHwnd = 0
End If
End Function
另外还有一种简便的方法：
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Private Function fGetWebBHwnd1(hwndParent As Long) As Long
Dim lngHwnd As Long
lngHwnd = FindWindowEx(hwndParent, 0, "Shell Embedding", vbNullString)
lngHwnd = FindWindowEx(lngHwnd, 0, "Shell DocObject View", vbNullString)
lngHwnd = FindWindowEx(lngHwnd, 0, "Internet Explorer_Server", vbNullString)
If lngHwnd <> 0 Then
fGetWebBHwnd1 = lngHwnd
Else
fGetWebBHwnd1 = 0
End If
End Function