Pass an ArrayList of objects from C++ to JAVA using JNI

I need to get the running Windows processes using C++ and have a Process struct in C++ having 2 fields: name and pid. I want to pass an ArrayList of Process from C++ to Java. I have found an example of how to pass an array of objects from C++ to Java, but I'd like to pass an ArrayList, and I was wondering if this is possible, before understanding that example and use an array.
I don't have much experience with C++ and I don't even know if you have something like an ArrayList in C++, so I'm sorry if it doesn't make any sense what I'm talking about. Thank you.

From C you can access and/or imnstantiate one of the
java collections. In other words, your C code should
simply populate java structures and a collection.I have read this is possible after I posted this, but didn't find an example yet. I began reading "Java Native Interface" book from Addison-Wesley today to get a better understanding of JNI.
If you know where to find an example of doing this, I would appreciate it. Otherwise, I suppose I will find this in the above mentioned book quite soon... Thank you.

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    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
    End Function
    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

    I don't think you can return a reference to Excel's main window like that as you are attempting to do.
    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
    Private Declare Function IIDFromString Lib "ole32" _
    (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, _
    ByRef ppvObject As Object) As Long
    Private Type GUID
    Data1 As Long
    Data2 As Integer
    Data3 As Integer
    Data4(7) As Byte
    End Type
    Private Const S_OK As Long = &H0
    Private Const IID_IDispatch As String = "{00020400-0000-0000-C000-000000000046}"
    Private Const OBJID_NATIVEOM As Long = &HFFFFFFF0
    Sub test()
    Dim i As Long
    Dim hWinXL As Long
    Dim xlApp As Object ' Excel.Application
    Dim wb As Object ' Excel.Workbook
    hWinXL = FindWindowEx(0&, 0&, "XLMAIN", vbNullString)
    While hWinXL > 0
    i = i + 1
    Debug.Print "Instance_" & i; hWinXL
    If GetXLapp(hWinXL, xlApp) Then
    For Each wb In xlApp.Workbooks
    Debug.Print , wb.Name
    End If
    hWinXL = FindWindowEx(0, hWinXL, "XLMAIN", vbNullString)
    End Sub
    'Function GetXLapp(hWinXL As Long, xlApp As Excel.Application) As Boolean
    Function GetXLapp(hWinXL As Long, xlApp As Object) As Boolean
    Dim hWinDesk As Long, hWin7 As Long
    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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