Let's say I have some structure

struct DetectItem { int x; int y; DetectItem(): x(0), y(0) {} }

And getting her pointer:

 JNIEXPORT jlong JNICALL Java_com_create(JNIEnv *env, jobject obj) { DetectItem detectItem = CreateNewDetectItem(); return (jlong) &detectItem; }

Then I try to get this created DetectItem through the following function:

 JNIEXPORT jint JNICALL Java_com_get(JNIEnv *env, jobject obj, jlong handle) { DetectItem* di = (DetectItem*) handle; return (jint)di->x; }

But as a result, I get the result -858993460 , although if you add cout to Java_com_create , then the DetectItem object contains normal values. How to make it work? I understand that in create I give a pointer to an object, and in get I accept it, but it does not work :(

  • So far made std::map<jlong, DetectItem> mapped like this. - lampa

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