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    Fuhrer, Vierte Reich DocAElstein's Avatar
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    This is page 2
    https://www.excelfox.com/forum/showt...dows-API/page2
    https://www.excelfox.com/forum/showthread.php/2989-Rough-Notes-and-posts-to-be-referenced-from-elsewhere-on-VBA-Windows-API/page2
    This is post #11 forum post24916
    https://www.excelfox.com/forum/showt...dows-API/page2
    https://www.excelfox.com/forum/showthread.php/2989-Rough-Notes-and-posts-to-be-referenced-from-elsewhere-on-VBA-Windows-API/page2
    This is post #11 forum post24916
    https://www.excelfox.com/forum/showt...ll=1#post24916
    https://www.excelfox.com/forum/showthread.php/2989-Rough-Notes-and-posts-to-be-referenced-from-elsewhere-on-VBA-Windows-API/page2
    https://www.excelfox.com/forum/showthread.php/2989-Rough-Notes-and-posts-to-be-referenced-from-elsewhere-on-VBA-Windows-API?p=24916&viewfull=1#post24916





    Some notes, codings etc. in support of some other posts
    https://eileenslounge.com/viewtopic....321979#p321979
    https://www.excelfox.com/forum/showt...ll=1#post24904


    Getting some windows identification info
    .

    Main coding courtesy of Dev Ashish, http://access.mvps.org/access/api/api0013.htm
    ( and https://eileenslounge.com/viewtopic....321978#p321978 )
    I did some minor adjustments, mostly in output to suit my own experiments

    Code:
    ' Original main Code Courtesy of Dev Ashish  http://access.mvps.org/access/api/api0013.htm  and  https://eileenslounge.com/viewtopic.php?p=321978#p321978
    '
    Private Declare Function apiGetClassName Lib "user32" Alias "GetClassNameA" (ByVal Hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Private Declare Function apiGetDesktopWindow Lib "user32" Alias "GetDesktopWindow" () As Long
    Private Declare Function apiGetWindow Lib "user32" Alias "GetWindow" (ByVal Hwnd As Long, ByVal wCmd As Long) As Long
    Private Declare Function apiGetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal Hwnd As Long, ByVal nIndex As Long) As Long
    Private Declare Function apiGetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal Hwnd As Long, ByVal lpString As String, ByVal aint As Long) As Long
    Private Declare Function FindWndNumber Lib "user32" Alias "FindWindowA" (Optional ByVal lpClassName As String, Optional ByVal lpWindowName As String) As Long
    Private Const mcGWCHILD = 5
    Private Const mcGWHWNDNEXT = 2
    Private Const mcGWLSTYLE = (-16)
    Private Const mcWSVISIBLE = &H10000000 '  Watch window gives  268435456 (even when no code is running)
    Private Const mconMAXLEN = 255
    
    Public Sub fEnumWindows()
    ' For worksheet output, not important for understanding the main coding
    Dim Ws As Worksheet: Set Ws = ThisWorkbook.Worksheets.Item(1)
    Dim Lc As Long, Lr As Long: Let Lc = Ws.Cells.Item(2, Ws.Columns.Count).End(xlToLeft).Column
     Let Ws.Cells.Item(1, Lc + 1) = CreateObject("WScript.Network").ComputerName & "      " & Format(Now(), "ddd,dd,mmm,yyyy")                  '  Environ$("computername")      Nigel Heffernan  https://stackoverflow.com/questions/3551055/how-to-get-name-of-the-computer-in-vba/10108951#10108951
     Let Ws.Cells.Item(2, Lc + 1) = "Hwnd": Let Ws.Cells.Item(2, Lc + 2) = "Class Name": Let Ws.Cells.Item(2, Lc + 3) = "Caption": Let Ws.Cells.Item(2, Lc + 4) = "Hwnd( Caption)": Let Ws.Cells.Item(2, Lc + 5) = "enum visible?"
    
    
    Dim lngx As Long, lngLen As Long, lngStyle As Long, strCaption As String
     Let lngx = apiGetDesktopWindow(): Debug.Print "Geted Desktop Window  " & lngx & " " & " CLass name " & fGetClassName(lngx)
     Let lngx = apiGetWindow(lngx, mcGWCHILD): Debug.Print "   First child to Desktop " & lngx & " CLass name " & fGetClassName(lngx) '   GW_CHILD = 5    The topmost of the given window's child windows. This has the same effect as using the GetTopWindow function, ... usually at the top of all the other children in the Z-order
        Do While Not lngx = 0 ' We are looping "equal level children", seperated not realy, just look seperate to us because of the seen to us z order
         Let strCaption = fGetCaption(lngx)
    '        If Len(strCaption) > 0 Then ' Those without a caption seem not important
             Let lngStyle = apiGetWindowLong(lngx, mcGWLSTYLE) '  apiGetWindowLong gets info,   GWL_STYLE  -16  retrieves the window styles
                ' For   enum visible windows only
    '            If lngStyle And mcWSVISIBLE Then   '
                 Let Lr = Ws.Cells.Item(Ws.Rows.Count, Lc + 1).End(xlUp).Row                                                    '  Handle             Class name          Caption
                    If lngStyle And mcWSVISIBLE Then
                     Let Ws.Cells.Item(Lr + 1, Lc + 5) = "enum visible " & lngStyle & " And " & mcWSVISIBLE
                    Else
                     'Let Ws.Cells.Item(Lr + 1, Lc + 5) = lngStyle & " And " & mcWSVISIBLE
                    End If
                 Let Ws.Cells.Item(Lr + 1, Lc + 6) = lngStyle: Ws.Cells.Item(Lr + 1, Lc + 7) = mcWSVISIBLE
                 Debug.Print FindWndNumber(lpClassName:=fGetClassName(lngx), lpWindowName:=vbNullString), fGetClassName(lngx); Tab(50); fGetCaption(lngx); Tab(100); FindWndNumber(lpClassName:=vbNullString, lpWindowName:=fGetCaption(lngx))
                 Let Ws.Cells.Item(Lr + 1, Lc + 1) = lngStyle & " " & FindWndNumber(lpClassName:=fGetClassName(lngx)): Let Ws.Cells.Item(Lr + 1, Lc + 2) = fGetClassName(lngx): Let Ws.Cells.Item(Lr + 1, Lc + 3) = fGetCaption(lngx): Let Ws.Cells.Item(Lr + 1, Lc + 4) = FindWndNumber(lpClassName:=vbNullString, lpWindowName:=fGetCaption(lngx))
    '            End If
    '        End If
         Let lngx = apiGetWindow(lngx, mcGWHWNDNEXT) '  GW_HWNDNEXT = 2   The window below the given window in the Z-order.
        Loop ' While Not lngx = 0  ' I am going through all the child windows of the desktop windows
    End Sub
    Private Function fGetCaption(Hwnd As Long) As String
    Dim strBuffer As String, intCount As Integer
     Let strBuffer = String$(Number:=255 - 1, Character:="0") ' "00000000000000000000000000000000..........000"
     Let intCount = apiGetWindowText(Hwnd:=Hwnd, lpString:=strBuffer, aint:=255) ' This makes  strBuffer  something like    *MSCTFIME UI 0000000000000000............000"
        If intCount > 0 Then Let fGetCaption = Left$(strBuffer, intCount)
    End Function
    Private Function fGetClassName(Hwnd As Long) As String
    Dim strBuffer As String, intCount As Integer
     Let strBuffer = String$(255 - 1, 0)
     Let intCount = apiGetClassName(Hwnd, strBuffer, mconMAXLEN)
        If intCount > 0 Then
         Let fGetClassName = Left$(strBuffer, intCount)
        End If
    End Function
    
    

    I got up to date more recently on my API references, https://eileenslounge.com/viewtopic....322050#p322050 , so I was able to understand a lot of that coding above.
    But the logic of If lngStyle And mcWSVISIBLE Then confused me a bit, even though I understand what it is doing.
    Investigating what typically finds its way into the coding at that line revealed that it is fed some big numbers on either side of the And , ( a fixed number on the right, varied numbers on the left).
    I could not see how it becomes True in some numbers and not on others. It is obviously not a simple thing since at first glance there is no obvious pattern to what numbers give true: We typically seem to have some spread of big numbers, positive and negative. Example numbers in the next screen shot in column B and C. The results in column D are typical of what I got in a few ways with VBA codings, and they seem to be doing something similar to that code line with the same numbers as the code line typically gets, and they get the same results.
    So its something to do with how in VBA , this sort of thing works

    If ___ And ___ Then
    Code:
    Sub TestStrangeIfAndLogic()
    Range("D2:D20").ClearContents
    Dim Rw As Long
        For Rw = 2 To 20
            If Range("B" & Rw).Value And Range("C" & Rw).Value Then Let Range("D" & Rw) = "True?"
        Next Rw
    End Sub
    Sub TestStrangeIfAndLogicArr()
    Range("D2:D20").ClearContents
    Dim Rw As Long, arrRws() As Variant: Let arrRws() = Range("A1:C20").Value
        For Rw = 2 To 20
            If arrRws(Rw, 2) And arrRws(Rw, 3) Then Let Range("D" & Rw) = "True?"
        Next Rw
    End Sub
    
    https://i.postimg.cc/NMg25kxm/Strang...wo-numbers.jpg Strange If __ And __ Then logic with two numbers.JPG



    I went off to get some help, https://eileenslounge.com/viewtopic.php?f=30&t=41610

    I got some good help, and the next few posts discus the issues, and get the final solutions and final understanding, which in initially looked like it would be fairly simple, after the help I got, but turned out to be a bit more complicated, mainly as I had never heard of …." 2’s Compliment Computer Codswollop" ( https://www.aimathcoach.com/en/mathg...olution_guide/
    https://www.excelfox.com/forum/showt...ll=1#post24921
    )

    I start looking at this issue in more detail in the next few post
    Attached Files Attached Files
    Last edited by DocAElstein; Yesterday at 09:52 PM.

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