Hook into a child class SysTreeView32 of VBE window - api

Question

I am pretty new to the WinApi calls although familiar with VBA. What I am trying to do is to hook to a child class SysTreeView32 of VBE window (Project Explorer TreeView). I would like to expand/collapse the tree view elements by modifying the registry keys (or alternatively sending the mouse clicks (mouse_event) although I prefer the first option).
I can find the Excel Main Window by using this code:
Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Sub Find_Window()
Dim hWndExcel As Long
hWndExcel = FindWindow("XLMAIN", Application.Caption)
MsgBox hWndExcel
End Sub
With the help of Window Detective I can access the names, properties, etc. of the child classes.
But I cannot work it out how to access/activate(or even return the HWID of) the SysTreeView32 child class to collapse/expand elements(folders). I am not sure how to iterate over the elements yet, but I will research this afterwards. The problem here is accessing the SysTreeView32 class. How can I achieve it?
When I try to msgbox this
FindWindow("wndclass_desked_gsk", Application.Caption)
or
FindWindow("SysTreeView32", Application.Caption)
a 0 is returned so I am obviously doing something wrong :/
Thank you for your time.

Answer 1

you ought to be using:
application.vbe.mainwindow.caption
here's some sample collapse code
Private Const TVE_COLLAPSE = &H1
Private Const TVE_COLLAPSERESET = &H8000
Private Const TVE_EXPAND = &H2
Private Const TVE_EXPANDPARTIAL = &H4000
Private Const TVE_TOGGLE = &H3
Private Const TV_FIRST = &H1100
Private Const TVM_EXPAND = (TV_FIRST + 2)
Private Const TVM_GETNEXTITEM = (TV_FIRST + 10)
Private Const TVGN_ROOT = &H0
Private Const TVGN_NEXTVISIBLE = &H6
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
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Sub CollapseProjects()
Dim hWndVBE As Long, hWndPE As Long, hWndTvw As Long, hNode As Long, varReturn
hWndVBE = FindWindowEx(0, 0, "wndclass_desked_gsk", Application.VBE.MainWindow.Caption)
hWndPE = FindWindowEx(hWndVBE, 0, "PROJECT", vbNullString)
hWndTvw = FindWindowEx(hWndPE, 0, "SysTreeView32", vbNullString)
hNode = SendMessage(hWndTvw, TVM_GETNEXTITEM, TVGN_ROOT, 0&)
Do While hNode <> 0
varReturn = SendMessage(hWndTvw, TVM_EXPAND, TVE_COLLAPSE, hNode)
hNode = SendMessage(hWndTvw, TVM_GETNEXTITEM, TVGN_NEXTVISIBLE, hNode)
Loop
End Sub
further to your comment, here's the code to collapse only the 'Microsoft Excel Objects' nodes
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
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function SendMessageB Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByRef lParam As Any) As Long
Private Const MAX_ITEM As Long = 256
Private Const TV_FIRST As Long = &H1100
Private Const TVM_EXPAND As Long = (TV_FIRST + 2)
Private Const TVM_GETNEXTITEM As Long = (TV_FIRST + 10)
Private Const TVM_GETITEM As Long = (TV_FIRST + 12)
Const TVE_COLLAPSE As Long = &H1
Const TVE_EXPAND As Long = &H2
Private Const TVGN_ROOT As Long = &H0
Private Const TVGN_NEXT As Long = &H1
Private Const TVIF_TEXT As Long = &H1
Private Const TVGN_NEXTVISIBLE = &H6
Private Type TVITEM ' was TV_ITEM
mask As Long
hItem As Long
state As Long
stateMask As Long
pszText As String
cchTextMax As Long
iImage As Long
iSelectedImage As Long
cChildren As Long
lParam As Long
End Type
Sub CollapseXLObjects()
Dim hWndVBE As Long
Dim hWndPE As Long
Dim hWndTvw As Long
Dim hNode As Long
Dim tvi As TVITEM
Dim nChild As Long
Dim sText As String
Dim varReturn
hWndVBE = FindWindowEx(0, 0, "wndclass_desked_gsk", Application.VBE.MainWindow.Caption)
hWndPE = FindWindowEx(hWndVBE, 0, "PROJECT", vbNullString)
hWndTvw = FindWindowEx(hWndPE, 0, "SysTreeView32", vbNullString)
hNode = SendMessage(hWndTvw, TVM_GETNEXTITEM, TVGN_ROOT, 0&)
Do While hNode <> 0
tvi.hItem = hNode
tvi.mask = TVIF_TEXT
tvi.cchTextMax = MAX_ITEM
tvi.pszText = String(MAX_ITEM, 0)
nChild = SendMessageB(hWndTvw, TVM_GETITEM, 0&, tvi)
If InStr(1, tvi.pszText, "Microsoft Excel Objects", vbTextCompare) > 0 Then
varReturn = SendMessage(hWndTvw, TVM_EXPAND, TVE_COLLAPSE, hNode)
Else
varReturn = SendMessage(hWndTvw, TVM_EXPAND, TVE_EXPAND, hNode)
End If
hNode = SendMessage(hWndTvw, TVM_GETNEXTITEM, TVGN_NEXTVISIBLE, hNode)
Loop
End Sub

Answer 2

If calling this sub from another sub (in my case a sub in an XL addin linked to a custom button which opens the VBE), and another module is highlighted (which might be in another project) then I've found the
Application.VBE.MainWindow.Caption
doesn't work. To capture the highlighted module I use:
Private Sub VisualBasicEditor()
On Error Resume Next
WinName = "Microsoft Visual Basic - " + ActiveWorkbook.Name + " [Running] - [" + Application.VBE.ActiveCodePane.CodeModule.Name + " (Code)]"
Application.VBE.MainWindow.Visible = True
Call CollapseXLObjects
End Sub
and in the module containing Sub CollapseXLObjects declare
Public WinName As String
and in Sub CollapseXLObjects
hWndVBE = FindWindowEx(0, 0, "wndclass_desked_gsk", WinName)