pass data between Java and C

Question

I have a C structure.

struct data{
    double value1[50];
    double value2[50];
    int count;
};

I want to map data from java to this C

Answer 1

Provide the following declaration to your java programmer:

public native double[] doData(double [] value1, double [] value2, int count);

In your c code you will be able to fill the structure with passed parameters. JNI header will look like this:

JNIEXPORT jdoubleArray JNICALL Java_package_className_doData(JNIEnv * , jobject, jdoubleArray , jdoubleArray, jint);