referance array passing to c++
hi,
from what i know, it is not possible to return a whole array back to java program, as java supports no pointers
so for my method what i have done is passed a static array to the native code and updated it from the c++ code so that when native code alters it, it should be altered in java automatically
but in actual this does not happen, any one has any ideas on this one?
i am giving my code below:
class DGlove
{
public static int[] values = new int[7];
public static boolean status = false;
public static native void getValues(int[] array);
public static native void connectDG();
public static native void disconnectDG();
public static native boolean getStatus();
static
{
System.loadLibrary("dg5dt");
}
public static void main (String[] args)
{
connectDG();
getValues(values);
status = getStatus();
System.out.println(status);
for (int i =0; i<=6;i++)
{
System.out.println(values);
}
//if (status == true)
//disconnectDG();
status = getStatus();
System.out.println(status);
getValues(values);
for (int i =0; i<=6;i++)
{
System.out.println(values);
}
}
}
//cpp file (native code)
# include "conio.h"
# include "DataGlove.h"
# include "DGlove.h"
# include "jni.h"
unsigned short arraydg15[17];
int arraydg5[6];
bool status=0;
DataGlove glove;
JNIEXPORT void JNICALL Java_DGlove_getValues
(JNIEnv *env, jclass obj, jintArray arr)
{
jsize len = env->GetArrayLength(arr);
if (status == 1)
{
glove.GetSensorRawValues (arraydg15);
// conversion from the 15 sensor array to the 5 sensor array
arraydg5[0] = arraydg15[0];
arraydg5[1] = arraydg15[3];
arraydg5[2] = arraydg15[6];
arraydg5[3] = arraydg15[9];
arraydg5[4] = arraydg15[12];
arraydg5[5] = arraydg15[16];
arraydg5[6] = arraydg15[17];
jint *body = env->GetIntArrayElements(arr,0);
for (int i =0;i<=len;i++)
{
body = arraydg5;
}
}
}
JNIEXPORT void JNICALL Java_DGlove_connectDG
(JNIEnv *env, jclass obj)
{
status = glove.Connect("COM1");
printf("data glove status %d", status);
getch();
}
JNIEXPORT void JNICALL Java_DGlove_disconnectDG
(JNIEnv *env, jclass obj)
{
status = glove.DisConnect();
}
JNIEXPORT jboolean JNICALL Java_DGlove_getStatus
(JNIEnv *env, jclass obj)
{
return status;
}
what i need to do is pass the array by referance to native c++ code , have it modified and get the values back in java
