Question

In the jni layer of the android code that I have written, am returning an array from the jni layer to the java layer. I am using DeleteLocalRef() to free the local reference before passing the result. i just wanted to make sure that the code i have written is proper. Please find the code below.Any help is appreciated.

extern "C"
{
JNIEXPORT jbyteArray JNICALL Java_com_jni_btRead(JNIEnv* env, jobject)
{

    unsigned char* reply = btRead();

    jbyteArray jba;
    if(reply)
    {       
        jba = env->NewByteArray(2048);
        env->SetByteArrayRegion(jba, 0, 2048, reinterpret_cast<jbyte*>(reply));
    }
    else
    {       
        jba = env->NewByteArray(0);
    }

    env->DeleteLocalRef(jba);
    return jba;
}
}

Answer 1

Local variables are always created in stack segment and hence destroyed after returning from function. This diagram may help.