Is there any way to determine the contents of another window?

I am still trying to find a way to programmatically get the text out of a window similar to the one shown in the attached screen shot.

The Text I am interested in is from the "Supplier Letter Fields" header through to the "Custom Fields" footer.

This all seems to be in one child window with the following details:

Class = AfxWnd42
Style = &H52000000
Handle = &H706EE
ID = &H0

Using the GetWindowText API for this window returns a zero length string

What other approach can I take to programmatically retrieve this info?

Thanks in advance for any assistance.

Use SendMessasge API with WM_GETTEXT.

Hi Serge,

Thank you for your response. I have tried the following code

VB Code:

Private Const WM_GETTEXT = &HD
Private Const WM_GETTEXTLENGTH = &HE
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Function GetText(WindowHandle As Long) As String
Dim TextReturned As String
Dim slength As Long
Dim retval As Long
slength = SendMessage(WindowHandle, WM_GETTEXTLENGTH, ByVal CLng(0), ByVal CLng(0)) + 1
TextReturned = Space(slength)
retval = SendMessage(WindowHandle, WM_GETTEXT, ByVal slength, ByVal TextReturned)
GetText = Left(TextReturned, retval)
End Function
 
Private Sub Form_Load()
Debug.Print "Returned text is: "; GetText(&H706EE )
End Sub

but this too is returning the result that GetText(&H706EE ) = "".

Any ideas as to why this may be the case?

(I am getting the hwnd for the controls on the Form from the code at http://support.microsoft.com/support.../Q112/6/49.asp )

Are you sure you got a valid hWnd of the control ???

Yes I was wondering that too!

But I have now found some code to enumerate all windows and controls at

http://support.microsoft.com/support.../q183/0/09.asp

and the information I am looking for doesn't seem to be retrievable through the GetWindowText API
(as it did not appear in any of the 30,000 or so windows that it found)!

I am not actually sure whether what I want to do is possible.
By way of comparison if I view a Microsoft Word Document then I can determine that the main document body is in a control of class
_WwG, and currently has a handle of &H70506
Yet despite the document containing visible text the GetWindowText function returns "".

As you may have gathered my understanding of this whole area is pretty poor so any help would be gratefully received!

Thanks a lot for your time.

Martin