如果GetStringUTFChars返回副本，你应该调用ReleaseStringUTFChars吗？

问题描述

Rob Gordon的Essential JNI：Java Native Interface一书包含以下代码示例，用于将jstring转换为C字符串：

The book "Essential JNI: Java Native Interface" by Rob Gordon contains the following code example to convert a jstring to a C string:

const char* utf_string;
jboolean isCopy;
utf_string = env->GetStringUTFChars(str, &isCopy);
/* ... use string ... */
if (isCopy == JNI_TRUE) {
    env->ReleaseStringUTFChars(str, utf_string);
}

请注意，它只调用 ReleaseStringUTFChars 如果 isCopy 为真。

Note that it only calls ReleaseStringUTFChars if isCopy is true.

但书（备用链接： http://192.9.162.55/docs/books/jni/html/objtypes.html#5161 ）说：

But the book Java Native Interface: Programmer's Guide and Specification (alternate link: http://192.9.162.55/docs/books/jni/html/objtypes.html#5161) says:

我认为这是戈登书中的错误是正确的吗？

I am correct in assuming this is a bug in Gordon's book?

推荐答案

是的，你的假设是正确的（你应该总是调用ReleaseStringUTFChars）。

Yes, your assumption is correct (you should always call ReleaseStringUTFChars).

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