how to pass array from java to c++?

Question

Java

I can pass prime numbers like int , and return them back. And int[] cannot be passed to c++, the typecast error says.

Answer 1

JNIEXPORT void JNICALL Java_SomeClass_someMethod(JNIEnv* env, jobject obj, jintArray array) {
    jsize size = (*env)->GetArrayLength(env, array);
    jint* buffer = (*env)->GetIntArrayElements(env, array, NULL);

    ...

    (*env)->ReleaseIntArrayElements(env, array, buffer, 0);
}

In the last parameter, it is JNI_ABORTworth passing if data from the array was needed, but the original array itself does not need to be changed. If changes to the array need to be saved, then JNI_ABORT0 must be passed instead.

Answer 2

Serialize the data into something language independent, like json, or some universal binary format