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

Hello,
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.

Similar Messages

Pass an array of integers from C to Java with JNI

Hello,
I have a C function that returns a struct me. The fields of this struct are all of type integer. I, with the fields of this structure create an array of integers in C language I would like to pass this array of integers c, in Java using JNI.
How can I make this?

I don't see how you compiled that.
It certainly will not compile for me.
jintArray position=(jintArray)(*env)->NewIntArray(env,2);That is the invocation idiom for C code.
jint f[2];You cannot have a variable declaration in the middle of a method (block) in C code. That is only allowed in C++.
C code and C++ code is not the same.
The following is C++ code. Note that it does NOT include getBinaryPoint() since that method could be the source of the problem.
jintArray position = env->NewIntArray(2);
if(position==NULL) return NULL;
jint f[2];
f[0]=3;
f[1]=4;
env->SetIntArrayRegion(position,0,2,f);
return position;

Can i return an Array of Objects from c++ to java ??

hello all,
Can i return an Array of Objects from c++ to java ??
If so how is it possible ??
regards,
gautam

I suggest you look into the JNI, Java Native Interface. The answer is yes.

How to pass arraylist of object from action class to jsp and display in jsp

I need to do the following using struts
I have input jsp, action class and action form associated to that. In the action class I will generate the sql based on the input from jsp page/action form, create a result set. The result set is stored as java objects in a ArrayList object.
Now I need to pass the arraylist object to another jsp to display. Can I put the ArrayList object in the request object and pass to the success page defined for the action? If this approach is not apprpriate, please let me know correct approach.
if this method is okay, how can I access the objects from arraylist in jsp and display their property in jsp. This java object is a java bean ( getter and setter methods on it).
( need jsp code)
Can I do like this:
<% ArrayList objList = (ArrayList)request.getattribute("lookupdata"): %> in jsp
(***I have done request.setattribute("lookupdata", arraylistobj); in action class. ***)
Assuming the java object has two properties, can I do the following
<% for (iint i=0. i<objList.size;I++){ %>
<td> what should i do here to get the first property of the object </td>
<td> what should i do here to get the first property of the object </td>
<% }
%>
if this approach is not proper, how can I pass the list of objects and parse in jsp?
I am not sure what will be the name of the object. I can find out how many are there but i am not sure I can find out the name
thanks a lot

Double post:
http://forum.java.sun.com/thread.jspa?threadID=5233144&tstart=0

2 TopLink Java Object from Table to be used in single selectOneChoice

Hello everyone, can I ask for help on how to solve my problem....
Here's my scenario, I have 2 tables namely tblCollege and tblCourse, they are related through tblCourse.CollegeCode = tblCollege.Code.
I use the jdeveloper wizard using TopLink -> Java Object from Table to add these table to my project. I created an EJB Data Control so that I can use them to my Userinterface using ADF Faces.
What I really want to do is that I need to have selectOneChoice component displaying:
tblCollege.Name + tblCourse.Name, and it should have a value of tblCollege.Code + tblCourse.Code,
so for example in my
tblCollege:
Code---------Name
1---------------Science
2---------------Music
tblCourse
Code-------Name-----------CollegeCode
1-------------Biology----------1
2-------------Computer-------1
3-------------Guitar------------2
what I want in my selectOneChoice is like this:
value----------display
1-1--------------Science-Biology
1-2--------------Science-Computer
2-3--------------Music-Guitar
I'm a little stuck on how I'm going to that. Thanks.

Bawasi,
I see a couple of angles of attack, but this really depends on the technologies involved. If you are using ADF Bindings in combination with ADF Faces then you need to shape the data at the entity level. If ADF Bindings are no the in equation, you can take a less aggressive approach and shape the data in a managed bean. What is not clear to me is the end-to-end use-case. I see the read-only (i.e. how to get data to the drop box), but I am
not certain what attribute on an entity you are attempting to set. Are you trying to set the course for the current user or for a master schedule? Finally, notice that the final shape of your data set shows a unique combinations, you could increase the performance of your use-case and ease of development simply by denormalizing your schema.
--RiC

Instantiating COM objects from within the java code in WLS

is there a way to use COM objects from servlets or ejb's,
with JVM, not with JView.
thanks,
ali.

Sun has released a beta product - its a COM bridge that you can use
to connect a Java2 JVM to a COM object with. I havent tried it yet
but I probably will soon.
Brad
"Michael Girdley" <[email protected]> wrote in message news:39b86deb$[email protected]..
>
>
No, at the current time we only support COM integration when using the
Microsoft JVM. The Jintegra product from Linar is good.
Thanks,
Michael
Michael Girdley
BEA Systems Inc
"Ali Ozgun" <[email protected]> wrote in message
news:[email protected]..
is there a way to use COM objects from servlets or ejb's,
with JVM, not with JView.
thanks,
ali.

Executing DLLs from Java using JNI vs Runtime.exec()

I am trying to understand the best way to execute a dll using java. The dll I am testing with takes a few input parameter. If I use JNI with System.loadLibrary("dll"); what do I need to do to pass the arguements in as well? Can I just add the arguements in the java code like private int xyz = "value"; and expect that the dll will accept them or is there special definitions I have to set up in the dll to make it work?
Alternatively I was looking at using Runtime to execute the dll by using Runtime.exec("dll param1 param2",env,filePath); Does anyone know if there are drawback to doing it this way vs. using JNI or is this just as efficient? Any help would be appreciated.

You seem to be confused...
"execute a dll using java"
Unless I'm mistaken, a dll is not executable. A dll is a library of code. This code has (hopefully) some well-defined entry points (declared in a header file somewhere) which you must call in a C/C++ file. The arguments you pass to the dll will come from java through JNI.
As far as your understanding of this entire process, it is obviously confused beyond the scope of a simple reply. I recommend you read the examples and ALL of the documentation available here:
http://java.sun.com/docs/books/tutorial/native1.1/index.html
When you get the/an example running (or just set up to run) then post your code and comments here for more help.
Ian

To read a DLL from java using JNI

Hi,
I had some DLL files (VB 5.0) which are providing interfaces. Is there any chance of accessing that using java (JNI). Also is there any De - Compiler available so that I can get the source code of the DLL file.
Regards,
Hari.

Hola Hari
To make a dll loadable through JNI, the interface
inside
the dll must be implemented the JNI way. Also a COM
interface does not help.
I would reccomend a certain product to automatise the
JNI interfacing process, but that would
require that you have the sourcecode of the dll
available.
But one thing you can do is to write a wrapper that
contains the dll classes and is implemented the JNI
way.
More precisely you write an interface wrapper in c/c++
that matches the methods of the dll and does use JNI
methods. Now inside that c++ wrapper you load the dll
and forward the calls from java to c++ vice versa.
Download the demo version of CENTRO.java here:
www.ablon.de
Bye, nilsHi Nils,
Thank you for your suggestion. Im new to JNI.
That dll's are in Visual Basic. I don't have the source code of the dll file. I got the interfaces available in the dll file from a Visual Basic program which make use of the dll file(which we are talking about). As I know only the method signatures in the interfaces(dll file), I request you to kindly provide me some help to wrap it in C/C++ program.
Thanks in advance.
Regards,
Hari.

Passing Opaque Objects from Oracle to Java

Hi all
I am trying to write a stored procedure that needs to be called from different triggers. Each triggers needs to pass a different set of data to the stored procedure. Now the problem is that i need to pack the different set of data into one opaque object type that i can pass onto java. Is there any way of doing this. I am using Oracle 9i running on Linux 2.4.9. I tried using the Object datatype in Oracle 9i. But am not able to pass a object datatype to java directly.

Didn't know that. Guess the way this API handles the struct is it puts it on the heap, since this idea (with passing a 32-bit var back and forth with a memory location) worked.
My next problem - I can't figure out a way to destroy a jstring: whenever I do an env->GetStringUTF((char*)charBuff), it seems to simply copy the bytes from the buffer
into the same String object up the length of the buff (so I get the extra bytes from the previous String if it was longer at the end).
Here's how it works: I have a loop in C code that parses tags inside a file, then depending on what tag it is, I create a new jobject and call a Java method to do stuff
to that object. As one of the parameters in the constructor I pass in a String that I create (as you can see above) from a character array, however I am getting
massive artifacts when I print out that String inside the Java method.
Thoughts? :(

How to return a char [][] from c++ to java with JNI

hi , i am new to JNI and i am having some troubles with a special task :
in fact i am supposed to treat some data stored in a char[100][100] value and then return the result to java , the result is the sam value bur modified i mean a char [100][100] variable too...
i saw that we can rely on
JNIEXPORT jobjectArray JNICALL Java_JNITest_newArray (JNIEnv *env, jclass, jint size )
jobjectArray joa = ... ); // what in my case ?;
jsize len1 = (jsize)env->GetArrayLength(joa);
for (int i=0; i<l en1; i++)
jintArray colonne = (jintArray)env->GetObjectArrayElement(joa, i);
jsize len2 = (jsize)env->GetArrayLength(colonne);
jint *element = env->GetIntArrayElements(colonne, 0);
for(int j=0; j<len2; j++)
       jint res = element[j];
             // process some treatment here
        // how now to return the result to java : joa modified !!
[/code]
may be some errors present in this piece of code ...but i rely on your help to have the solution!! please i am really desperated !

You know that any JNI function for an array handles or creats only one-dimensional array. But if you know Java array structure then with these functions you can create Java arrays of any dimensions.
A Java multi-dimensional array is a set of nested one-dimensional arrays (consider dimensions from left to right). I give you only schema of this process. Let create the array of your type (for example, char [2][3]):
1) create one-dimensional object array "[C"[/b] of size two for the first dimension (and assign it to some variable of type jobjectArray) ;
2) create two three-dimentional char arrays and assign these local references to each element of the array created in prev. step;
3) fill each array created in (2) with your data (characters);
4) return to Java code the reference created in the step (1) and do not delete local references created in steps (1) and (2).

Transfer a Jpeg From Delphi to Java via JNI?

Hi Guys,
I am currently working on a project in which I have Windows DLL code that takes a screen capture (I'm using Delphi to write this). The result of this capture is stored as a TJpegImage. I have my Delphi code hooked to Java code (which the main program is written in) via JNI. I am trynig to transfer the Jpeg in a format in which Java can easily take it and make a BufferedImage out of it. How can I go about this? I have a few ideas, but I want to do it in the most efficient way possible. If someone knows how to do this, can they please share the solution with me?
Thanks,
-Tony

whome0,
Yes, thanks, that's exactly what I've been using. Basically, I'm at the point now where I know how to transfer the bytes, but for some reason, when I do this on the Java end:
ByteArrayInputStream input = new ByteArrayInputStream( byteArr );
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder( input );
BufferedImage bi = decoder.decodeAsBufferedImage();
I get this error:
com.sun.image.codec.jpeg.ImageFormatException: Not a JPEG file: starts with 0x60 0x23
at sun.awt.image.codec.JPEGImageDecoderImpl.readJPEGStream(Native Method)
at sun.awt.image.codec.JPEGImageDecoderImpl.decodeAsBufferedImage(Unknown Source)
at com.sun.media.protocol.screen.LiveStream.read(LiveStream.java:166)
at com.sun.media.parser.RawBufferParser$FrameTrack.transferData(RawBufferParser.java:725)
at com.sun.media.protocol.screen.LiveStream.run(LiveStream.java:235)
at java.lang.Thread.run(Unknown Source)
I am baffled at this point, because I do a byte count before I send from my Delphi code, and a byte count on the Java receiving end, and they are identical. Looking at other JPGs I have on my hard drive, they begin in the same manner that this file does. So I'm not sure what's going on here.
-Tony

Can I call a C function from Java (using JNI) ??

hello,
I need to call one C function from remote device and get its return value(o/p) (for my application it is device SSID ) and display in the client PC.
Is it possible in java without using SNMP connction?.
please give me idea about it.
I need this information as soon as possible.
Thank you.

see JNI...
basically declare a native method in your java class, then run javah on the class thus generating a *.h file. Then implement the c/c++ function. Compile the c/c++ part as a shared library, and make sure its accessible from your LD_LIBRARY_PATH env variable.
Go through the steps in the JNI docs, and things shoulde be fine... hopefully ;)

Calling a third Party dll from java using JNI

Hi
I want an immediate help from u all.
I have athird party c dll with .h and .lib file
I wont be able to cahnge any thing in those files.
I want to call the functions of that from my Java code.
Ist possible to call the dll without writing any c or c++ wrapper over it?if yes , how to do it?

Hi,
You may use a generic wrapper like JNative.
Commercial wappers also exists.
--Marc (http://jnative.sf.net)

ArrayList problem ....i can remove my object from my arrayList

hi all, i am going to remove a object from my array by using arrayList.However, it can`t work properly and did nth for me..i don`t know why...could anyone give me some suggestion and show me what i did wrong on my code ....i stated more detail next to my code...plesae help...
public class MusicCd
     private String musicCdsTitle;
        private int yearOfRelease;
     public MusicCd()
          musicCdsTitle = "";
          yearOfRelease = 1900;
     public MusicCd(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
          //yearOfRelease = newYearOfRelease;
     public MusicCd(String newMusicCdsTitle, int newYearOfRelease)
          musicCdsTitle = newMusicCdsTitle;
          yearOfRelease = newYearOfRelease;
     public String getTitle()
          return musicCdsTitle;
     public int getYearOfRelease()
          return yearOfRelease;
     public void setTitle(String newMusicCdsTitle)
          musicCdsTitle = newMusicCdsTitle;
     public void setYearOfRelease(int newYearOfRelease)
          yearOfRelease = newYearOfRelease;
     public boolean equalsName(MusicCd otherCd)
          if(otherCd == null)
               return false;
          else
               return (musicCdsTitle.equals(otherCd.musicCdsTitle));
     public String toString()
          return("Music Cd`s Title: " + musicCdsTitle + "\t"
                 + "Year of release: " + yearOfRelease + "\t");
import java.util.ArrayList;
import java.io.*;
public class MusicCdStore
   ArrayList<MusicCd> MusicCdList;
   public void insertCd()
        MusicCdList = new ArrayList<MusicCd>( );
        readOperation theRo = new readOperation();
        MusicCd theCd;
        int muiseCdsYearOfRelease;
        String muiseCdsTitle;
          while(true)
                String continueInsertCd = "Y";
               do
                    muiseCdsTitle = theRo.readString("Please enter your CD`s title : ");
                    muiseCdsYearOfRelease = theRo.readInt("Please enter your CD`s year of release : ");
                    MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));
                    MusicCdList.trimToSize();
                    continueInsertCd = theRo.readString("Do you have another Cd ? (Y/N) : ");
               }while(continueInsertCd.equals("Y") || continueInsertCd.equals("y") );
               if(continueInsertCd.equals("N") || continueInsertCd.equals("n"));
                                                //MusicCdList.add(new MusicCd(muiseCdsTitle, muiseCdsYearOfRelease));
                              break;
                  //System.out.println("You `ve an invalid input " + continueInsertCd + " Please enter (Y/N) only!!");
   public void displayAllCd()
                System.out.println("\nOur CD collection is: \n" );
          System.out.println(toString());
   public String toString( )
        String result= " ";
        for( MusicCd tempCd : MusicCdList)
             result += tempCd.toString() + "\n";
        return result;
   public void searchingMusicCd()
        readOperation theRo = new readOperation();
        String keyword = theRo.readString("Enter a CD `s Title you are going to search : ") ;
        ArrayList<MusicCd> results = searchForTitle(keyword );
          System.out.println("The search results for " + keyword + " are:" );
          for(MusicCd tempCd : results)
               System.out.println( tempCd.toString() );
   //encapsulate the A
   public void removeCd()
        readOperation theRo = new readOperation();
        String keyword = theRo.readString("Please enter CD `s title you are going to remove : ") ;
        ArrayList<MusicCd> removeMusicCdResult = new ArrayList<MusicCd>();
              System.out.println("The CD that you just removed is " + keyword );
          for(MusicCd tempCd : removeMusicCdResult)
               System.out.println( tempCd.toString() );
   //problem occurs here : i am so confused of how to remove the exactly stuff from my arrayList
   //pls help
   private ArrayList<MusicCd> removeCdForTitle(String removeCdsTitle)
         MusicCd tempMusicCd = new MusicCd();
         tempMusicCd.setTitle(removeCdsTitle);
        // tempMusicCd.setTitle(removeCdsTitle);
        //tempMusicCd.getTitle() = removeCdsTitle;
        ArrayList<MusicCd> removeMusicCdResult = new ArrayList<MusicCd>();
        for(MusicCd currentMusicCd : MusicCdList)
             if((currentMusicCd.getTitle()).equals(tempMusicCd.getTitle()))
                 // removeMusicCdResult.remove(currentMusicCd);
                     MusicCdList.remove(currentMusicCd);
        removeMusicCdResult.trimToSize();
        return removeMusicCdResult;
   private ArrayList<MusicCd> searchForTitle(String searchString)
        ArrayList<MusicCd> searchResult = new ArrayList<MusicCd>();
        for(MusicCd currentMusicCd : MusicCdList)
             if((currentMusicCd.getTitle()).indexOf(searchString) != -1)
                  searchResult.add(currentMusicCd);
        searchResult.trimToSize();
        return searchResult;
import java.util.*;
public class MusicCdStoreEngine{
     public static void main(String[] args)
          MusicCdStore mcs = new MusicCdStore( );
          mcs.insertCd();
          //display the Cd that you just insert
          mcs.displayAllCd();
          mcs.removeCd();
          mcs.displayAllCd();
          mcs.searchingMusicCd();
//Acutally result
//Please enter your CD`s title : ivan
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : y
//Please enter your CD`s title : hero
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : n
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
//Please enter CD `s title you are going to remove : hero
//The CD that you just removed is hero
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
//Enter a CD `s Title you are going to search : hero
//The search results for hero are:
//Music Cd`s Title: hero     Year of release: 1992
//>Exit code: 0
//Expected result
//Please enter your CD`s title : ivan
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : y
//Please enter your CD`s title : hero
//Please enter your CD`s year of release : 1992
//Do you have another Cd ? (Y/N) : n
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992
//Please enter CD `s title you are going to remove : hero
//The CD that you just removed is hero
//Our CD collection is:
// Music Cd`s Title: ivan     Year of release: 1992
//Music Cd`s Title: hero     Year of release: 1992<<-- it is not supposed to display cos i have deleted it from from array
//Enter a CD `s Title you are going to search : hero
//The search results for hero are:
//Music Cd`s Title: hero     Year of release: 1992<<-- i should have get this reuslt...cos it is already delete from my array
//>Exit code: 0
import java.util.*;
public class readOperation{
     public String readString(String userInstruction)
          String aString = null;
          try
                     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               aString = scan.nextLine();
          catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aString;
     public char readTheFirstChar(String userInstruction)
          char aChar = ' ';
          String strSelection = null;
          try
               //char charSelection;
                     Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               strSelection = scan.next();
               aChar = strSelection.charAt(0);
          catch (NoSuchElementException e)
               //if no line was found
               System.out.println("\nNoSuchElementException error occurred (no line was found) " + e);
          catch (IllegalStateException e)
               // if this scanner is closed
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aChar;
     public int readInt(String userInstruction) {
          int aInt = 0;
          try {
               Scanner scan = new Scanner(System.in);
               System.out.print(userInstruction);
               aInt = scan.nextInt();
          } catch (InputMismatchException e) {
               System.out.println("\nInputMismatchException error occurred (the next token does not match the Integer regular expression, or is out of range) " + e);
          } catch (NoSuchElementException e) {
               System.out.println("\nNoSuchElementException error occurred (input is exhausted)" + e);
          } catch (IllegalStateException e) {
               System.out.println("\nIllegalStateException error occurred (scanner is closed)" + e);
          return aInt;
}

//problem occurs hereI'm not sure that the problem does occur within the
removeCdForTitle() method.
Your main() method calls removeCd() which obtains the title of
the CD to be removed (keyword). But remoceCd() never
calls removeCdForTitle(), so nothing is ever removed.

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
Dim IDispatch As GUID 'GUID used in call to AccessibleObjectFrom Window function
'Set up GUID to be used for all instances of Excel that are found
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
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
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
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
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
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

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

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