Multidimensional array as argument to a Java method

Hello all,
I have defined in C the following array :
char my_array[100][3];I want to pass this mutidimensional array to a Java method. How should I write my C array as an argument of the Java method ?
TIA

You cannot do that in a straight-forward fassion. The C compiler reserves 300 consecutive bytes in memory, the base address of which is accessible through my_array. The base address of each of your 100 rows can be accessed as my_array[row]. The length of each row is fixed and only known to the programmer and the compiler which uses it to calculate the row offsets.
Java has a slightly different approach to multi-dimensional arrays. Actually they are simply not implemented. What you see and use as multi-dimensional array is a composition of one array holding the references to other arrays - remember, arrays are also only Objects. This implies that the data of different rows does not at all represent a contingious memory region.
So what you need to do is to allocate an array of size 100, which holds char[]s - references to char-arrays. Then you iterate through your C array and for each row you allocate an char-array of length 3 initialized to the appropriate row. The references to those char-arrays need to be stored in the char[]-array.
Use env->NewCharArray(env, length) to create a new char[] and env->NewObjectArray(env, length, clazz, null) to create the char[][]. Accesing the elements of these arrays is described in:
http://java.sun.com/docs/books/tutorial/native1.1/implementing/array.html

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Hi,
I am new to JNI.
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You are missing some steps.
When you invoke a java method from C++, the parameters have to be java parameters, no C++ parameters.
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jintArray intArray = env->NewIntArray(10); // Ten elments
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How to call java method having array as argument from c++ ?

Hello sir,
how to call java method having array as arguments from c++;
here is java code which is called from c++
class PQR {
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suppose all jvm invocation is done...

For someone well versed in java, C++ and JNI although tedious that should be obvious.
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I left out the description tree itself. I suppose you could duplicate the entire reflection api in C++.
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Hello friends.
Have searched the forum, but haven's found the answer.
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Call java method having array as returntype

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here i tried this thing but didnt work out..please help me.....its urgent..
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int* data= new int[len];
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Thanks for your reply !
Initially I also thought that the set of the value could be wrong and so
I used a printf statement in C to monitor the transferred value.
And still: the value I put in was different from what I got in java.
After this I put in simple numbers like 1,2,3 and in java I still got
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Hey guys,
I'm fairly new to programming in java.
I want to a write a class method that adds up its
command line arguments which are numbers. For
example, if the input was .... 5 2 3....then the
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I have been told to use the Convert to convert a
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I am trying to call a java method from c passing a String as an argument.
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//Initalise jstring and class (to recieve String)
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jclass texts = (*env)->GetObjectClass(env, obj);
jmethodID text = (*env)->GetMethodID(env, texts, "texture", "([Ljava/lang/String;)V");
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textp = (*env)->NewStringUTF(env,ret.textures->texturePath);
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public void texture(String texturePath){
The error I get is as follows:
SIGSEGV 11 segmentation violation
si_signo [11]: SEGV
si_errno [0]:
si_code [1]: SEGV_MAPERR [addr: 0xc]
stackpointer=FFBED790
"Screen Updater" (TID:0x4f9060, sys_thread_t:0x4f8f98, state:CW, thread_t: t@11, threadID:0xf2d31d78, stack_bottom:0xf2d32000, stack_size:0x20000) prio=4
[1] java.lang.Object.wait(Object.java:424)
[2] sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:78)
[3] sun.awt.ScreenUpdater.run(ScreenUpdater.java:98)
"AWT-Motif" (TID:0x40be50, sys_thread_t:0x40bd88, state:R, thread_t: t@10, threadID:0xf2d71d78, stack_bottom:0xf2d72000, stack_size:0x20000) prio=5
[1] sun.awt.motif.MToolkit.run(Native Method)
[2] java.lang.Thread.run(Thread.java:479)
"SunToolkit.PostEventQueue-0" (TID:0x431950, sys_thread_t:0x431888, state:CW, thread_t: t@9, threadID:0xf2e71d78, stack_bottom:0xf2e72000, stack_size:0x20000) prio=5
[1] java.lang.Object.wait(Object.java:424)
[2] sun.awt.PostEventQueue.run(SunToolkit.java:407)
"AWT-EventQueue-0" (TID:0x430ea8, sys_thread_t:0x430de0, state:CW, thread_t: t@8, threadID:0xf3071d78, stack_bottom:0xf3072000, stack_size:0x20000) prio=6
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[4] java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:91)
[5] java.awt.EventDispatchThread.run(EventDispatchThread.java:83)
Exiting Thread (sys_thread_t:0xff343db0) : no stack
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[1] java.lang.Object.wait(Object.java:424)
[2] java.lang.ref.Reference$ReferenceHandler.run(Reference.java:130)
"Signal dispatcher" (TID:0x13d180, sys_thread_t:0x13d0b8, state:MW, thread_t: t@4, threadID:0xfe3f1d78, stack_bottom:0xfe3f2000, stack_size:0x20000) prio=10
"main" (TID:0x38918, sys_thread_t:0x38850, state:R, thread_t: t@1, threadID:0x25228, stack_bottom:0xffbf0000, stack_size:0x800000) prio=5 *current thread*
[1] loader.Callbacks.nativeMethod(Native Method)
[2] loader.Callbacks.main(Callbacks.java:184)
[3] graphics.GR_MakeTrack.init(GR_MakeTrack.java:60)
[4] graphics.GR_MakeTrack.main2(GR_MakeTrack.java:49)
[5] graphics.GR_MakeTrack.main(GR_MakeTrack.java:41)
[6] control.GE_main.GE_main1(GE_main.java:87)
[7] control.GE_main.main(GE_main.java:66)
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I am trying to call a java method from c passing a
String as an argument.
my C code is as follows.
//Initalise jstring and class (to recieve String)
jstring textp;
jclass texts = (*env)->GetObjectClass(env, obj);
jmethodID text = (*env)->GetMethodID(env, texts,
"texture", "([Ljava/lang/String;)V");
Hi Pete,
your problem is that the method texture you are trying to find does not exist. If you look carefully at your declaration of the method signature in the GetMethodID call you will see "([Ljava/lang/String;)V" which is trying to find a method that accepts a String array as its parameter. Remove the [ from the method signature and it should work ok. You might want to test text (jmethodID) for NULL or 0 before trying to call it as well.

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Hello everybody,
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Regards
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attached: JNI source code
/////////////////////////////////////////// source code ///////////////////////////////////////////////
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "cxtypes.h"
#include "cvaux.h"
#include "org_kimm_media_image_data_JNIOpenCV.h"
#include <stdio.h>
JNIEXPORT jint JNICALL
Java_org_kimm_media_image_data_JNIOpenCV_getFaces(JNIEnv *env, jobject object, jstring path)
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CvHaarClassifierCascade *pCascade = 0;
CvMemStorage *pStorage = 0;
CvSeq *pFaceRectSeq;
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jobjectArray recPoints;
const char *str = env->GetStringUTFChars(path, 0);
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          (!pCascade) ? "didn't load Haar Cascade --"
               "make sure Path is correct" :
          "failed to allocate memory for data storage");
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scale = 2;
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pFaceRectSeq = cvHaarDetectObjects(small_image, pCascade, pStorage,
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                                             cvSize(50,50));                         //use XML default for smallest search scale
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int x = pFaceRectSeq->total;
jclass intArrCls = env->FindClass ( "[I" ) ;
recPoints = env->NewObjectArray ( x, intArrCls, NULL ) ;
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//   recPoints[j] = (jintArray)env->NewIntArray(3);
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return pFaceRectSeq->total;
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Multidimensional Array Sort

Please help. I am very new to java and trying to build a multidimensional array. I have two variables 1)item_name and 2)item_value. These are values that I obtain by looping through a database result set. I need to build and array that can hold these variables. Once the multidimensional array is built I need to be able to sort it by item value.
For example I would like to do something like this:
while (rs.next)
array.name = item_name
array.value = item_value
end
array.sort(value)
Thanks for any help!

Don't use a multidimensional array. Use an array of objects, where the objects are of a class that you define. It might be something as simple as class Item that just has two fields--name and value--and their getters and setters. Or maybe just getters if you want the class to be immutable.
Have the class implement Comparable and sort on value.
If you sometimes want to sort on value and sometimes on name, then you'll need to either define two Comparators (one for name, one for value) or make the class Comparable on whichever is the more "natural" ordering and define a Comparator for the other one.
Either put them in an array and use one of the java.util.Arrays.sort methods to sort them, or put them in a List (java.util.LinkedList or java.util.ArrayList) and use Collections.sort to sort them.

Multidimensional array as argument to a Java method

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