JNI: get Window-Handle of JFrame

Hello,
I'm calling a DLL method (written in VC), that needs a Window-handle (HWND) as parameter. How can I get the Handle of my JFrame to pass it into the DLL function?
All samples are designed for getting the HWND of a Canvas. But obviously it does not work with any kind of Frame.
Can somebody tell me ?
Thank you, Lars
P.S. I'm working with SUN 1.4

see this one, i was looking for same thing:
http://forum.java.sun.com/thread.jsp?forum=57&thread=238779

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Hi,
I'd like to get the window ID of a frame. I'm runing java on Linux.
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Linux_Java wrote:
How do i get the Window Id / handle to java frame.You can't get it from within Java, that much I know, and in fact since it is an OS construct it is meaningless in java. If you are working with MS Windows, I'm guessing that your best bet is to play with some of the functions in the User32 library, such as enumerateWindows and such, and by doing this you'll find out how to get a handle on the JFrame. If it's unix/linux (and given your name, that is a reasonable assumption) then I have no idea.
If I am giving any actionlistener to my frame that has to be reflected in C windowNo idea what you mean here.
Anybody can send me the full source code too.Doesn't this kind of go against the philosophy of these forums?
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Source=System.Windows.Forms
StackTrace:
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at System.Windows.Forms.Control.BeginInvoke(Delegate method, Object[] args)
at System.Windows.Forms.Control.BeginInvoke(Delegate method)
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at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
InnerException:
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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.

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'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
Dim IDispatch As GUID 'GUID used in call to AccessibleObjectFrom Window function
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Dim tmp1 As Variant 'Return value from AccessibleObjectFromWindow
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SetIDispatch IDispatch
IDispatch = IDispatch
'Get a handle to the desktop
hWndDesk = GetDesktopWindow 'This seems to work
Do
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'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)
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If hWndXL > 0 Then
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instances of Excel
ExcelInstances = ExcelInstances + 1
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-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
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Loop Until hWndXL = 0
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Private Sub SetIDispatch(ByRef ID As GUID)
'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
Private 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
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(ByVal lpsz As Long, ByRef lpiid As GUID) As Long
Private Declare Function AccessibleObjectFromWindow Lib "oleacc" _
(ByVal hWnd As Long, ByVal dwId As Long, ByRef riid As GUID, _
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Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
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Debug.Print , wb.Name
Next
End If
hWinXL = FindWindowEx(0, hWinXL, "XLMAIN", vbNullString)
Wend
End Sub
'Function GetXLapp(hWinXL As Long, xlApp As Excel.Application) As Boolean
Function GetXLapp(hWinXL As Long, xlApp As Object) As Boolean
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Dim obj As Object
Dim iid As GUID
Call IIDFromString(StrPtr(IID_IDispatch), iid)
hWinDesk = FindWindowEx(hWinXL, 0&, "XLDESK", vbNullString)
hWin7 = FindWindowEx(hWinDesk, 0&, "EXCEL7", vbNullString)
If AccessibleObjectFromWindow(hWin7, OBJID_NATIVEOM, iid, obj) = S_OK Then
Set xlApp = obj.Application
GetXLapp = True
End If
End Function
Note as written if an instance does not have any loaded workbooks a reference will not be returned (though a workbook can be added using DDE, but convoluted!)
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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Call library function in Labview:
=================================
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Take life as it comes! you may never know what's gonna happen Tommorrow

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