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How pass Rect from Java code to Jni?

Hi :) I have a problem... How can I pass Rect object from Java to C ?

If I want pass Mat... I do something like this:


Mat mat = new Mat()


nativeMethod(JNIEnv * jenv, jclass, jlong matFromJava){
  Mat mat = *(Mat*)matFromJava;

but getNativeObjAddr() for Rect objects doesn't exist, so how can I do this?