我需要在使用NewIntArray创建的数组上调用ReleaseIntArrayElements吗? [英] Do I need to call ReleaseIntArrayElements on an array created with NewIntArray?

问题描述

我有一个本地方法，可以对位图进行一些工作.在方法内部，我通过一个方法调用来获取图像数据，该方法将数据写入使用NewIntArray创建的jintArray参数:

I have a native method that does some work on a bitmap. Inside the method I grab the image data via a method call that writes the data to a jintArray parameter that I've created with NewIntArray:

jintArray pixels = env->NewIntArray(width * height);

我不需要将此数组返回给正在调用的Java代码-仅用于在此方法中进行处理.我需要在pixels上致电ReleaseIntArrayElements吗?如果是这样，由于不需要将其复制回Java数组，该为elems参数传递什么内容?

I don't need to return this array back to the calling Java code - it's only for processing while in this method. Do I need to call ReleaseIntArrayElements on pixels? If so, what do I pass for the elems parameter, since I don't need to copy it back to a Java array?

void (JNICALL *ReleaseIntArrayElements) (JNIEnv *env, jintArray array, jint *elems, jint mode);

void (JNICALL *ReleaseIntArrayElements) (JNIEnv *env, jintArray array, jint *elems, jint mode);

推荐答案

您无需对其进行任何操作.它是一个本地引用，当您的JNI方法退出时，它将被清除.正如爱德华·汤普森(Edward Thompson)所暗示的那样，ReleaseIntArrayElements()与GetIntArrayElements().相反，它没有其他功能.

You don't need to do anything with it. It is a local reference and it will be cleaned up when your JNI method exits. As Edward Thompson hints above, ReleaseIntArrayElements() is the converse of GetIntArrayElements(). It has no other function.

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