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ID: 259
Viewed: 2365
Added: Jul 26, 2002
Snippet uploaded by: snippet
Written By: unknown
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Option Explicit

Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
(ByVal hwndParent As Long, _
ByVal hwndChildAfter As Long, _
ByVal lpszClass As String, _
ByVal lpszWindow As String) As Long

Declare Function GetClassName Lib "user32" Alias "GetClassNameA" _
(ByVal hWnd As Long, _
ByVal lpClassName As String, _
ByVal nMaxCount As Long) As Long

Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hWnd As Long, _
ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long ' <---

Public Const WM_USER = &H400
Public Const TB_BUTTONCOUNT = (WM_USER + 24)

' Arbitrary maximum classname length
' (don't know this actual value, if there is one at all...)
Public Const MAX_CLASS = 64

Sub main()
Dim ahWnds() As Long
Dim nWindows As Integer
Dim i As Integer

Call WindowsFromClassname(0, "ToolbarWindow32", ahWnds(), nWindows)
For i = 1 To nWindows
Debug.Print "&H" & Hex(ahWnds(i)) & " btns = " & _
SendMessage(ahWnds(i), TB_BUTTONCOUNT, 0, 0)

End Sub

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' Enumerates the child windows of the specified parent window
' and retrieves the window handles of the specified classname.

' hwndParent - parent window handle whose children are to be enumerated
' sTargetClass - classname of windows in which to retrieve handles from
' ahWnds() - variable dimension array filled with the window handles
' nWindows - the count of ahWnds() dimensions, specify 0 on first call.

' Specify 0 for hwndParent to enum the desktop's children (top level windows)
' Uses "inside-out" recursion (user-defined term :>), which enumerates the first
' child window found that has children windows (as opposed to "outside-in"
' recursion, which caches all child windows found that have child windows
' and then enumerates them at the end of the proc...)

Private Sub WindowsFromClassname(hwndParent As Long, _
sTargetClass As String, _
ahWnds() As Long, _
nWindows As Integer)
Dim hwndChild As Long
Dim sCurClass As String * MAX_CLASS
Dim nChars As Integer

' Get the first child window of the current parent window
hwndChild = FindWindowEx(hwndParent, 0, vbNullString, vbNullString)

Do While hwndChild

' If the current child window's classname is the same as
' our target classname, increment the window handle counter,
' reallocate the array, and add the handle to the array.
nChars = GetClassName(hwndChild, sCurClass, MAX_CLASS)
If nChars Then
If (Left$(sCurClass, nChars) = sTargetClass) Then
nWindows = nWindows + 1
ReDim Preserve ahWnds(nWindows)
ahWnds(nWindows) = hwndChild
End If
End If

' Does the current child window has it's own children...
If FindWindowEx(hwndChild, 0, vbNullString, vbNullString) Then
' It does, recursively call this proc again making the
' current child window the new parent.
Call WindowsFromClassname(hwndChild, sTargetClass, ahWnds(), nWindows)
End If

' Get the next sibling of the current child window
hwndChild = FindWindowEx(hwndParent, hwndChild, vbNullString, vbNullString)


End Sub

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