What is “jobject thiz” in JNI and what is it used for?

Question

I am having a hard time finding an answer to this. But, what is \"jboject thiz\" used for in JNI function calls? For example:

jobjectArray Java_com_gnychis         


        

Answer 1

I found this link that should help clarify the question.

https://library.vuforia.com/articles/Solution/How-To-Communicate-Between-Java-and-C-using-the-JNI

Here is an example in it that uses the "jobject".

JNIEXPORT void JNICALL
Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_initApplicationNative(
                            JNIEnv* env, jobject obj, jint width, jint height)
{
    ...
    jclass activityClass = env->GetObjectClass(obj);
    jmethodID getTextureCountMethodID = env->GetMethodID(activityClass,
                                                    "getTextureCount", "()I");
    if (getTextureCountMethodID == 0)
    {
        LOG("Function getTextureCount() not found.");
        return;
    }
    textureCount = env->CallIntMethod(obj, getTextureCountMethodID);
    ...
}