Using JNI to pass an array of Strings to C and back from C

I have some C code that I want to integrate with a new Java application and I need to be able to pass an array of strings to the C program and then the C program needs to be able to build an array of strings that is passed back to the Java program. I've got the first part working so that I can pass an array of strings to the C program and display them, but I can't figure out how to build the strings in C so that that when Java gets back control, it can display the strings tha were built in the C program.
Has anyone done this? Do you have some sample code?

I have a program which is written in C. I can give you the whole project as it is in a zip file. You'll need VC to work with it. By the way, I am using Windows for development. Should you need it, I'll mail you the same. Give me your mail address.

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Is there a way to type cast an array of strings to numbers and back again?

I'm working on an application where I want to type cast a string like "power supply" into an array of existing numbers. Then sort the existing numbers, and finally convert the casted numbers back into a string so it can be read by the user. In the attachment, you can see my latest attempt with flatten/unflatten data and the 'convert string to byte array'. I can't seem to make this work. Any ideas?
Thanks - Paul
Attachments:
Paul's Temp scan for components.vi ‏56 KB

OK, here's a quickie (LabVIEW 7.0).
Simply get the sort key from the 1D array, then build the table.
Message Edited by altenbach on 10-27-2006 01:34 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
SortedTable.png ‏4 KB
SortedTable.vi ‏37 KB

How do I pass an array of strings? (Help Me... Please!!! .Read Me....)

Dear All.
Help Me...
English is not very good. Google translator is used.
How do I pass an array of strings?
Please refer to the VB program
===========================================
Private Sub m_btn_Click()
    Dim nReturn As Long
    Dim sPpid As String
    Dim sMdln As String
    Dim sSoftRev As String
    Dim nCount As Long
    Dim saCCodes(2) As String
    Dim naPCount(2) As Long
    Dim saPNames(10) As String
    sPpid = "PPID001"
    sMdln = "Mdln"
    sSoftRev = "Rev001"
    nCount = 2
    saCCodes(0) = "1"
    naPCount(0) = 5
    saPNames(0) = "Param001"
    saPNames(1) = "Param002"
    saPNames(2) = "Param003"
    saPNames(3) = "Param004"
    saPNames(4) = "Param005"
    saCCodes(1) = "2"
    naPCount(1) = 5
    saPNames(5) = "Param006"
    saPNames(6) = "Param007"
    saPNames(7) = "Param008"
    saPNames(8) = "Param009"
    saPNames(9) = "Param010"
    nReturn = m_XGem.GEMReqSend(sPpid, sMdln, sSoftRev, nCount, saCCodes(0), naPCount(0), saPNames(0))
    If (nReturn = 0) Then
        Call Me.AddMessage("[EQ ==> XGEM] GEMReqSend successfully")
    Else
        Call Me.AddMessage("[EQ ==> XGEM] Fail to GEMReqSend (" & nReturn & ")")
    End If
End Sub
=================================================
nCount, naPCount enough saCCodes, saPNames value must be sent.
How to handle an array of strings in LabView is impatient.
I want to VB program implemented in LabView.

Have you actually tried to right click on the according node parameter and select Create->Constant or Create-Control??
And I don't see any string array in the parameter list. That are all simple strings and the VB code in your first post clearly shows that the call to the function only indexes the first element of those arrays to be passed to the function, not the entire array.
If the function really reads arrays despite being declared as only taking strings then it is using some weirdo VB trickery and there will be no way to replicate that in LabVIEW.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

JSP Tag- Passing an array of string as an Attribute

Can I pass an array of String as an attribute to a JSP Tag? I read the specification but It does not say any thing about this.
Thanks in Advance.

I thought JSP tags had to deal strictly with string values?

How do I use Garage Band to practice my guitar against lesson CDs and backing track CDs

How do I use Garage Band to practice my guitar against lesson CDs and backing track CDs

GarageBand on your Mac or on an iPad?
If you are asking abot GB on a Mac you do the following:
Create a new GarageBand project with a Guitar track
Insert the CD and drag the audio file of the Lesson track or backing track to an empty region below the tracks in the timeline of the GarageBand window.
Plug in a set of head phones and put them on to listen to your backing track.
Plug in your guitar and select the guitar track.
Click on the measure where you want to start your recording and select the guitar track.
Press "record" and start to play.
Regards
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Array of strings in container won't pass to array of strings in LabVIEW cluster

I'm new to TestStand but am a CLD. I've taken a 3-day custom course that covered most of TestStand Core 1 and some of Core 2. I'm using TestStand 2013 and LabVIEW 2013.
I have a VI that needs an input of a cluster containing, in this order:
1D array of strings named Column_Labels
2D array of doubles named Results_Data
1D array of paths named Graphics_File_Paths
1D array of booleans named Pass_Fail
In TestStand I created a custom data type called Maxim_Results from the VI module tab in the sequence. When I reference a local (MINSYS_Reuslts) that is made from this Type I get the following error:
No corresponding subproperty in argument 'Locals.MINSYS_Results' of type 'Maxim_Results' for cluster element 'Maxim_Results.Column_Labels'
If, however, I reference each container element to each cluster element separatley there is no error:
Can anyone help me understand why this is happening?
Kelly Bersch
Certified LabVIEW Developer
Kudos are always welcome
Solved!
Go to Solution.

Hey Kelly,
I just set up the situation you described, and it worked properly for me. However, I did notice that in your example where you referenced each element individually, your Column_Labels element is actually called "Column_Lables". If this was also misspelled in the LabVIEW Cluster Passing setting for the custom type, it would cause the behavior you're seeing. Could this possibly be the case?
Daniel E.
TestStand Product Support Engineer
National Instruments

Using BC4J to pass an array to a stored function

I have successfully implemented the use of BC4J view objects to pass and retrive values from a stored database procedure/function as per Steve Muench's paper.
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At the database level, I have created a nested table with one of the columns being a table of numbers. A wrapper function is called with the array type being one of the in parameters and the database updated.
I am however having no luck building the array in my Java code and passing it to the database through an expert-only view object.
I have :
1. Database wrapper function has an extra parameter for the table of numbers (number(10))
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4. Update my test module class to
-- Test module class
String _am = "transaction2.transaction2module", _cf = "Transaction2ModuleLocal";
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-- Transaction2ModuleImpl.java
public ProcessTransactionImpl getProcessTxn()
    return (ProcessTransactionImpl)findViewObject("ProcessTxn");
public TxnResultType getTxnResult(String p1, String p2, String p3, Number[] p4)
    return getProcessTxn().getTxnResult(p1, p2, p3, p4);
-- ProcessTxnImpl.java
public TxnResultType getTxnResult(String p1, String p2, String p3, Number[] p4)
    setWhereClauseParam(0,p1);
    setWhereClauseParam(1,p2);
    setWhereClauseParam(2,p3);
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}but the error message given is :
oracle.jbo.SQLStmtException: JBO-27122: SQL error during statement preparation. Statement: select transaction_wrapper(:0, :1, :2, :3) as txn_result from dual
java.sql.SQLException: Invalid column type
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Can anyone offer some suggestions ?
Thanks,
Brent

Thanks for the reply - I had nearly given up on this ! I did add the setWhereClause statement as you suggested
setWhereClause("p1=:0 and p2=:1 and p3=:2 and p4=:3");but still got the same error. I have posted the entire output which may help you see what's still going wrong (hopefully!)
oracle.jbo.SQLStmtException: JBO-27122: SQL error during statement preparation.
Statement: SELECT * FROM (select test_array(:0,:1,:2,:3) as result from dual) QRSLT WHERE (p1=:0 and p2=:1 and p3=:2 and p4=:3)
     void oracle.jbo.server.QueryCollection.executeQuery(java.lang.Object[], int)
          QueryCollection.java:541
     void oracle.jbo.server.ViewObjectImpl.executeQueryForCollection(java.lang.Object, java.lang.Object[], int)
          ViewObjectImpl.java:2650
     void oracle.jbo.server.ViewRowSetImpl.execute(boolean, boolean)
          ViewRowSetImpl.java:523
     void oracle.jbo.server.ViewRowSetImpl.executeQuery()
          ViewRowSetImpl.java:564
     void oracle.jbo.server.ViewObjectImpl.executeQuery()
          ViewObjectImpl.java:2614
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          TxnViewImpl.java:25
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          TransModuleImpl.java:29
     void mypackage5.TestArray.main(java.lang.String[])
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## Detail 0 ##
java.sql.SQLException: Invalid column type
     void oracle.jdbc.dbaccess.DBError.throwSqlException(java.lang.String, java.lang.String, int)
          DBError.java:187
     void oracle.jdbc.dbaccess.DBError.throwSqlException(int, java.lang.Object)
          DBError.java:229
     void oracle.jdbc.dbaccess.DBError.throwSqlException(int)
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     void oracle.jdbc.driver.OraclePreparedStatement.setObject(int, java.lang.Object, int, int)
          OraclePreparedStatement.java:2782
     void oracle.jdbc.driver.OraclePreparedStatement.setObject(int, java.lang.Object)
          OraclePreparedStatement.java:2905
     boolean oracle.jbo.server.ViewRowSetImpl.bindParameters(java.lang.Object[], java.sql.PreparedStatement)
          ViewRowSetImpl.java:1313
     void oracle.jbo.server.QueryCollection.executeQuery(java.lang.Object[], int)
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     void oracle.jbo.server.ViewObjectImpl.executeQueryForCollection(java.lang.Object, java.lang.Object[], int)
          ViewObjectImpl.java:2650
     void oracle.jbo.server.ViewRowSetImpl.execute(boolean, boolean)
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     void oracle.jbo.server.ViewRowSetImpl.executeQuery()
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     void oracle.jbo.server.ViewObjectImpl.executeQuery()
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          TxnViewImpl.java:25
     java.lang.String mypackage5.TransModuleImpl.getResult(java.lang.String, java.lang.String, java.lang.String, oracle.jbo.domain.Number[])
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     void mypackage5.TestArray.main(java.lang.String[])
          TestArray.java:17
Exception in thread main
Process exited with exit code 1.I had to do a new example as I could not find the code I was using earlier. This is my java class
import oracle.jbo.client.Configuration;
import oracle.jbo.domain.Number;
import mypackage5.common.TransModule;
public class TestArray
public static void main(String[] args)
    String _am = "mypackage5.TransModule", _cf = "TransModuleLocal";
    String str1 = "String1";
    String str2 = "String2";
    String str3 = "String3";
    Number[] num4 = {new Number(1001),new Number(1002),new Number(1003),new Number(1004)};
    TransModule testModule = (TransModule)Configuration.createRootApplicationModule(_am,_cf);
    String txnResult = testModule.getResult(str1,str2,str3,num4);
    System.out.println("Result = " + txnResult);

Passing int arrays to strings

I'm having trouble passing an array of integers to a string and vice versa i.e. the array has
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element[1] =0
element[2] =0 but it can hold up to 16 elements
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Hi Johannes,
(There may be exceptions but) No, variables are not passed and returned by reference.
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Message was edited by: juliefrommiami

The good news after my hard drive was replaced during Apple's Seagate replacement program -- all my data and settings reinstalled seamlessly through Time Machine and my external hard drive. Bad news? My BT keyboard will now only forward delete when I hit the delete key rather than backward delete. I find this so ironic since I hated this feature when I switched from PC to Mac, but now I'm totally used to it. I tried resetting the default under system preferences, but it didn't help. Otherwise, keyboard works perfectly. This is so strange. Anyone have any suggestions? Oh -- and now I see my arrows don't work either.
Message was edited by: juliefrommiami

I am unable to use Iboost app, when i try to use it, I get an error "iBoost App is damaged" and reinstall from app store. I get the same error even after installing a fresh copy. Need help to resovle this issue.

“iBoostUp.app” is damaged and can’t be opened. Delete “iBoostUp.app” and download it again from the App Store.
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typedef struct {
int32 dimSize;
LStrHandle elt[1];
} LStrHandleArray;
typedef LStrHandleArray **LStrHandleArrayHandle;
void someMethod(LStrHandleArrayHandle arrayOut) {
// attempting to write the string "asdf" in the first element in the array. (1D array)
int newSize = 1;
MgErr e = NumericArrayResize(uL, 1L, (UHandle*)&arr
ayOut, newSize);
(*arrayOut)->dimSize = newSize;
LStrHandle hdl = *(*arrayOut)->elt;
long str_size = strlen("asdf");
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LStrLen(*hdl) = str_size;
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Thanks!
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-Aaron Marks
National Instruments
Attachments:
resize.zip ‏252 KB

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We are using jni.h but its getting errors, please check it this
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Abstract:Basic JNI example: making a Win32 API call
Making Native Windows API calls from within a Java Application
One of the main points of Java is to be completely platform independent. However, sometimes it will occur that the developer of an
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Below are the steps for writing a Java application that makes a Win32 API call. The application generates a Swing Jframe and makes it
system modal, or gives it the �Always On Top� functionality, similar to that of the Windows NT Task Manager.
Steps to follow:
1. Write the Java code for the application
2. Run javah.exe on your .class file to generate a C header file
3. write the implementation of your native methods
4. create the shared library
5. run the application
1. Write the Java code for the application
import java.awt.*;
import sun.awt.*;
import sun.awt.windows.*;
import javax.swing.*;
import java.awt.event.*;
public class Frame1 extends JFrame {
int windowHWND = 0;
JButton jButton1 = new JButton();
public Frame1() {
//windowHWND = this.getHwnd();
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
public int getHwnd() {
DrawingSurfaceInfo w = (DrawingSurfaceInfo) ((DrawingSurface) getPeer()).getDrawingSurfaceInfo();
w.lock();
WDrawingSurfaceInfo win32 = (WDrawingSurfaceInfo) w;
int hwnd = win32.getHWnd();
w.unlock();
return hwnd;
static {
System.loadLibrary("windowOnTop");
public static native void WindowAlwaysOnTop(int hwnd, boolean flag);
public static void main(String[] args) {
Frame1 frame11 = new Frame1();
frame11.setSize(400,400);
frame11.setVisible(true);
private void jbInit() throws Exception {
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this.addWindowListener(new java.awt.event.WindowAdapter() {
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this_windowOpened(e);
public void windowClosing(WindowEvent e) {
this_windowClosing(e);
this.getContentPane().add(jButton1, BorderLayout.NORTH);
void this_windowOpened(WindowEvent e) {
windowHWND = this.getHwnd();
System.out.println("the value is: " + this.getHwnd());
this.WindowAlwaysOnTop(windowHWND, true);
void this_windowClosing(WindowEvent e) {
System.exit(0);
Once the code is written, compile it with Jbuilder or the command line javac.exe tool which will result in a generated .class file. You will use
this .class file in the next step.
2. Run javah.exe on your .class file to generate a C header file
The following line represents the basic syntax for running javah.exe:
javah Frame1
where Frame1 is the name of the argument class.
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example the .h file that was generated from the above Java code will be emitted being that it is quite large.
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be some issues with using a version of javah.exe that is different from that of the JDK you are using to compile.
3. write the implementation of your native methods
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#include "jni.h"
#include "Frame1.h"
#include <stdio.h>
#include<windows.h>
JNIEXPORT void JNICALL Java_Frame1_WindowAlwaysOnTop(JNIEnv *env, jclass obj, jint hwnd, jboolean flag)
if (flag)
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else
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return;
You will notice several things: one is that the function signature has �Java_Frame1_� preceeding the name of the function. If there was a
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Second, you will notice the #include �jni.h�. Normally this would be #include<jni.h>, depending on how you have your libraries set up within
your C compiler.
4. create the shared library
Now you are ready to create the shared library. Using your C compiler, create a .dll file with the code from the C implementation file. Refer
to the doccumentation of the C compiler for details on creating a .dll file.
For those interested in using Borland C++ Builder:
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which was generated.
Remember in the Java code in step one there is a line:
static {
System.loadLibrary("windowOnTop");
�windowOnTop� is the name of the .dll file. You can name it whatever you want, just make sure that you specify the appropriate name when
loading the library.
5. run the application
Finally you are ready to run the application. From the command line use java.exe and as the argument specify the name of the class that
you compiled in step one. Once the system loads your DLL, the window that the VM creates should mimic the �Always On Top�
functionality.
We are getting errors like this
�Compiling JNI.H:
Error JNI_MD.H 23: , expected
Error JNI.H 115: Declaration missing
Error JNI.H 200: ) expected
Error JNI.H 202: ) expected

#include "jni.h"
#include "Frame1.h"
#include <stdio.h>
#include<windows.h>
JNIEXPORT void JNICALL Java_Frame1_WindowAlwaysOnTop(JNIEnv *env, jclass obj, jint hwnd, jboolean flag)
if (flag)
SetWindowPos((HWND) hwnd,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);
else
SetWindowPos((HWND) hwnd,HWND_NOTOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);
return;
We are getting errors like this
�Compiling JNI.H:
Error JNI_MD.H 23: , expected
Error JNI.H 115: Declaration missing
Error JNI.H 200: ) expected
Error JNI.H 202: ) expected

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hi
im trying to create a method that takes three arrays of strings as parameters and replaces some words in one of them
heres my code
class A0
public static void main (String[] args)
int index;
String[] in = {"life","is","a","bowl","of","pits"};
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int index1;
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for (index1=0;index1<in.length;index1++)
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I've got some code written in C and I want to interact with these code using JNI. But these code comprehends lots of c and h files, spreaded in lots of directories. To compile all of these, I have some makefiles. My question is: how can I start managing all of these code using JNI, I mean, what could it be my start point? Should I try to change the c code that calls everything?
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Gilmar

Where can I put my new generated java, c and h files,
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Using JNI to pass an array of Strings to C and back from C

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