VB Forum / Win API / April 2008

If you haven't used EnumChildWindows before you might find
it a little bit tricky. It enumerates all child windows, all the
way down, using a callback function.

Private Declare Function EnumChildWindows Lib "user32" (ByVal hWndParent As
Long, ByVal lpEnumFunc As Long, lParam As Long) As Long

Dim LRet as Long, H1 as long
LRet = EnumChildWindows(H1, AddressOf EnumChildProc, 0)

  In the two lines above, H1 is the handle of window
you want to find all children of. EnumChildProc is the
callback.

As shown below, EnumChildProc receives the handle of each
child window in turn. You can then use that to check classname,
title, etc. The sample here uses a global variable HCur to
receive the handle of the relevant window when it's found.
This sample is looking for a window with class name that
matches another global variable, sClassName. But of course
you can put any check, or combination of checks, into your
EnumChildProc function.
 The EnumChildWindows function will continue until either
all children have been returned or you return 0 from EnumChildProc.

Public Function EnumChildProc(ByVal hWnd As Long, lParam As Long) As Long
  Dim s2 As String
    s2 = GetWinClass(hWnd)
   If InStr(1, s2, sClassName, 1) > 0 Then
     HCur = hWnd
     EnumChildProc = 0
   Else
     EnumChildProc = 1
   End If
End Function

Hi I used the following code:

//I found the window(which gives wrong window)
 _windowHandle = FindWindow("#32770", null);

           if (_windowHandle != IntPtr.Zero)
           {
               //I try to get all the child windows for that window
              List<IntPtr> childWindows =
OutlookWin32Window.EnumChildWindows(_windowHandle);
               // get a list of captions for the child windows
              List<string> childWindowNames =
OutlookWin32Window.GetWindowNames(childWindows);
           }

This is all getting me wrong window basically  _windowHandle =
FindWindow("#32770", null); itself is returning wrong window.

How do I get the right window. Sorry if I am asking very basic
question as I am not at all familiar with win32 api's

I finally got the handle

System.Diagnostics.Process[] procs =
System.Diagnostics.Process.GetProcessesByName("Outlook");
           _windowHandle = procs[0].MainWindowHandle;

childWindows = OutlookWin32Window.EnumChildWindows(hParentWnd);

StringBuilder windowName = new StringBuilder(260);
           foreach (IntPtr hWnd in childWindows )
           {
               int textLen = GetWindowText(hWnd, windowName, 260);

               // get the windowtext
               windowNameList.Add(windowName.ToString());
               if (windowName.ToString().Equals("To:"))
               {
                   _windowLike = GetParent(hWnd);

               }

           }

So I got the main process for outlook, iteratated through all the
windows compared for "To:" and if the comparison is true I got the
parent of the window which gave me the reading pane.

Thanks you all for helping me out.