Use a window handler in a webutil_c_api.invoke

Hi
I need to get the window handler of the forms, but I always get 0 from get_window_property( 'my_win',WINDOW_HANDLE )
and wen I ran the function:
webutil_c_api.invoke(ps_dll,'TWAIN_AcquireToFilename',func_param_acq);
the function send me a messagebox of "invalid window handler", then the twain execute well the function and when it finish, the web browser window is closed.
Can somebody tell me what is wrong ?
Is not possible to use a C function in a dll with webutil_c_api, that needs a window handler as a parameter
Thanx in advance

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Why i'm getting exception InvalidOperationException: Invoke or BeginInvoke cannot be called on a control until the window handle has been created ?

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The exception is on the BeginInvoke part.
In the last few days i was running the program many times and i didn't have this exception even once.
And now every times i'm running it i'm getting the exception.
System.InvalidOperationException was unhandled by user code
HResult=-2146233079
Message=Invoke or BeginInvoke cannot be called on a control until the window handle has been created.
Source=System.Windows.Forms
StackTrace:
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.BeginInvoke(Delegate method, Object[] args)
at System.Windows.Forms.Control.BeginInvoke(Delegate method)
at mws.ScanningClouds.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in d:\C-Sharp\Download File\Downloading-File-Project-Version-012\Downloading File\ScanningClouds.cs:line 715
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
InnerException:
Line 715 is: this.BeginInvoke(new MethodInvoker(delegate

Where are you starting the background worker from? Possibly the constructor of the form?
It would be greatly appreciated if you would mark any helpful entries as helpful and if the entry answers your question, please mark it with the Answer link.

How to Use AccessibleObjectFromWindow API in VBA to Get Excel Application Object from Excel Instance Window Handle

I need to get the Excel.application object from a window handle using AccessibleObjectFromWindow. I can't seem to make the code work. First, I successfully search for the XLMAIN windows. Then, when I get a handle, I execute the AccessibleObjectFromWindow
function. It seems to return a value of -2147467262 in all cases. Therefore, I believe that it is returning an error value. I can't figure out how to determine the meaning of this value.
If it is an error value, I believe that one or more arguments are in error. My best guess at present is that the GUID argument is incorrect. I have tried two GUID values: {00020400-0000-0000-C000-000000000046} and {90140000-0016-0409-0000-0000000FF1CE}.
I have seen both used in conjunction with OBJID_NATIVEOM. Neither one seems to work. I really would prefer not to use the second one as it has an Excel major and minor version number. I would hate to have to change this code, if a new minor version appeared.
The attached code has been commented to show which parts have been shown to work and which not. I'm at my wits end and really need help.
Thanks
'This module is located in Access 2010, but this is an Excel question.
Option Compare Database
Option Explicit
' Module-Level Declarations
'The GetDesktopWindow function and FindWindowEx function work just fine.
Public Declare Function GetDesktopWindow Lib "user32" () As Long
Public 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
'I'm not getting the expected output from this function (see below)
Private Declare Function AccessibleObjectFromWindow& Lib "oleacc.dll" _
(ByVal hwnd&, _
ByVal dwId&, _
riid As GUID, _
xlwb As Object)
Type GUID
lData1 As Long
iData2 As Integer
iData3 As Integer
aBData4(0 To 7) As Byte
End Type
Function ExcelInstances() As Long
' Procedure-Level Declarations
' Value of OBJID_NATIVEOM verified by checking list of Windows API constants _
on this site: http://www.lw-tech.com/q1/base.htm
Const OBJID_NATIVEOM = &HFFFFFFF0
Dim hWndDesk As Long 'Desktop window
Dim hWndXL As Long 'Child window
Dim objExcelApp As Object 'Final result wanted: Excel application object
'Following variable (xlapp) to be set by AccessibleObjectFromWindow function
Dim xlapp As Object
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Dim tmp1 As Variant 'Return value from AccessibleObjectFromWindow
' Executable Statements
SetIDispatch IDispatch
IDispatch = IDispatch
'Get a handle to the desktop
hWndDesk = GetDesktopWindow 'This seems to work
Do
'Get the next Excel window
'The following statement seems to work. We are finding and counting _
correctly all the instances of Excel. hWndXL is non-zero for each _
instance of Excel
hWndXL = FindWindowEx(GetDesktopWindow, hWndXL, "XLMAIN", vbNullString)
'If we got one, increment the count
If hWndXL > 0 Then
'This works. We correctly count all _
instances of Excel
ExcelInstances = ExcelInstances + 1
'Here is the problem. The following statement executes and returns a value of _
-2147467262. xlapp, which is passed by reference to AccessibleObjectFromWindow, _
is set to nothing. It should be set to the object for Excel.application. _
I believe that this value is not an object. I tried to reference tmp1. in the _
immediate window. There was no Intellisense.
'I think that the function in returning an error value, but I can't figure _
out what it is. I believe that AccessibleObjectFromWindow returns error _
values, but I don't know where to find their values so I can interpret the _
function's results.
'As best I can tell, the hWndXL parameter is correct. It is the handle for _
an instance of Excel. OBJID_NATIVEOM is set correctly (see constant declaration _
above). xlapp is passed by reference as a non-initialized object variable, which _
will be set by AccessiblObjectFromWindow. IDispatch may be the problem. It is set _
as shown below in the procedure SetIDispatch(ByRef ID As GUID). This procedure _
appears to work. I can see that IDispatch is set as I intended and correctly _
passed to AccessibleObjectFromWindow.
tmp1 = AccessibleObjectFromWindow(hWndXL, OBJID_NATIVEOM, IDispatch, xlapp)
'Need to write code to test tmp1 for error. If none, then set objExcelApp = _
object. Also, I exect xlapp to be set to Excel.application
End If
'Loop until we've found them all
Loop Until hWndXL = 0
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'Defines the IDispatch variable. The interface _
ID is {90140000-0016-0409-0000-0000000FF1CE}.
'NOT USING {00020400-0000-0000-C000-000000000046}, _
which could be the problem
'9 is release version - first version shipped (initial release)
'0 is release type - retail/oem
'14 is major version
'0000 is minor version
'0016 is product ID - MS Excel 2010
'0409 is language identifier - English
'0 is x86 or x64 - this is x86
'000 reserved
'0 is debug/ship
'000000FF1CE is office family ID
With ID
.lData1 = &H90140000
.iData2 = &H16
.iData3 = &H409
.aBData4(0) = &H0
.aBData4(1) = &H0
.aBData4(2) = &H0
.aBData4(3) = &H0
.aBData4(4) = &H0
.aBData4(5) = &HF
.aBData4(6) = &HF1
.aBData4(7) = &HCE
End With
End Sub
DaveInCalabasas

I don't think you can return a reference to Excel's main window like that as you are attempting to do.
Ref:
http://msdn.microsoft.com/en-us/library/windows/desktop/dd317978(v=vs.85).aspx
It's relatively straightforward to return any workbook's window in any given instance, and in turn it's parent Excel app. Try the following and adapt as required (and include error handling) -
Option Explicit
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ByVal lpsz2 As String) As Long
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Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
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Next
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Function GetXLapp(hWinXL As Long, xlApp As Object) As Boolean
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Dim obj As Object
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If AccessibleObjectFromWindow(hWin7, OBJID_NATIVEOM, iid, obj) = S_OK Then
Set xlApp = obj.Application
GetXLapp = True
End If
End Function
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FWIW there are two other very different approaches to grab all running Excel instances though something along the lines of the above is simplest.
Peter Thornton

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AutoIt Example (v7).vi ‏25 KB

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Hello everyone !
I am having a .Net Windows application (VB.Net) that creates a lot of reports (the same report document for different clients and dates) for exporting them to PDF.
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=================================
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Take life as it comes! you may never know what's gonna happen Tommorrow

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