Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" _ (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As LongPrivate Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal _ hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As LongPrivate Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal _ hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _ lParam As Any) As LongPrivate Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, _ ByVal wCmd As Long) As LongPrivate Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As LongPrivate Declare Function GetDesktopWindow Lib "user32" () As Long'API constantsConst WM_GETTEXT = &HDConst WM_GETTEXTLENGTH = &HEConst GWL_HINSTANCE = (-6)Const GWL_HWNDPARENT = (-8)Const GWL_STYLE = (-16)Const GWL_EXSTYLE = (-20)Const GW_CHILD = 5Const GW_HWNDFIRST = 0Const GW_HWNDLAST = 1Const GW_HWNDNEXT = 2Const GW_HWNDPREV = 3Const GW_MAX = 5Const GW_OWNER = 4' Fill a treeview with the complete windows hierarchy' The text of each node will be in the format: handle caption class_name' The tag of each node is the window's caption, useful if you want' to perform a simple search through the windows loaded'' The first parameter is the TreeView to fill, the second is the handle' of the window to start with (or zero for the desktop window)'' Example: fill the treeview control with ALL the windows' starting with the desktop window' FillWindowsTree TreeView1Function FillWindowsTree(tvw As TreeView, Optional ByVal hwnd As Long) As Long Dim nNode As Node Dim lChild As Long Dim sText As String On Error Resume Next ' provide a default for hWnd argument If hWnd = 0 Then tvw.Nodes.Clear hWnd = GetDesktopWindow() End If ' build the node's text: hwnd "caption" class sText = CStr(hwnd) & " """ & GetWindowCaption(hwnd) & """ " & _ GetWindowClass(hwnd) ' look if the treeview has a node for the parent window Set nNode = tvw.Nodes("H" & GetParent(hwnd)) ' if not, add a root node If nNode Is Nothing Then Set nNode = tvw.Nodes.Add(, , "H" & CStr(hwnd), sText) Else ' if so, add this node as child of that node Set nNode = tvw.Nodes.Add(nNode, tvwChild, "H" & CStr(hwnd), sText) End If nNode.Tag = GetWindowCaption(hwnd) ' find the first child window lChild = GetWindow(hwnd, GW_CHILD) Do While lChild <> 0 ' call recursively this function FillWindowsTree tvw, lChild ' until there are no more child windows lChild = GetWindow(lChild, GW_HWNDNEXT) LoopEnd Function' return the caption of a windowFunction GetWindowCaption(ByVal hwnd As Long) As String Dim length As Long Dim text As String length = SendMessage(hwnd, WM_GETTEXTLENGTH, 0, ByVal 0&) text = Space$(length + 1) SendMessage hwnd, WM_GETTEXT, length + 1, ByVal text GetWindowCaption = Left$(text, length)End Function' return the class name of the specified windowFunction GetWindowClass(ByVal hwnd As Long) As String Dim sClass As String sClass = Space$(256) GetClassName hwnd, sClass, 255 GetWindowClass = Left$(sClass, InStr(sClass, vbNullChar) - 1)End Function


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