Get the pointer of a Java ByteBuffer though JNI

Question

How can I get a pointer to the inner array of a Java ByteBuffer?

JNIEXPORT void JNICALL test(JNIEnv *env, jobject thiso) {
    jclass cls = env->FindClass         


        

Answer 1

void * data = env->GetDirectBufferAddress(obj);

The ByteBuffer must be a direct one for this to work.

Answer 2

If you're trying to return the address of the first element within m_buffer, then you can just do:

return m_buffer;

..or:

return &m_buffer[0]