How do I convert an unsigned int to jint? Do I have to convert it at all, or can I just return it without any special treatment? This is basically my code right now, but I can't test it, as I haven't setup JNI locally.

JNIEXPORT jint JNICALL

Java_test_test(JNIEnv* env, jobject obj, jlong ptr)

{

MyObject* m = (MyObject*) ptr;

unsigned int i = m->get();

return i;

}

解決方案

In the general case, jint is equivalent to int, and so can hold about half the values of unsigned int. Conversion will work silently, but if a jint value is negative or if an unsigned int value is larger than the maximum value a jint can hold, the result will not be what you are expecting.

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