JNI中jclass的类名 [英] Class name from jclass in JNI

问题描述

这可能是一个愚蠢的问题，表明缺乏对JNI的理解.我正在写一个封装Java VM的C ++程序:我正在使用CallVoidMethod之类的调用在VM中调用函数.这纯粹是背景，与问题无关.

This is probably a daft question that reveals a lack of understanding of JNI. I'm writing a C++ program that encapsulates the Java VM: I'm calling functions within the VM using calls such as CallVoidMethod. That's purely background and not very relevant to the question.

我希望能够找到给定jclass实例的Java类的名称.有什么办法吗?我可以像在Java程序中那样调用GetName函数吗?

I would like to be able to find the name of the Java class given a jclass instance. Is there any way to do this? Could I just call the GetName function, as I would in a Java program?

推荐答案

jclass实例是将在其上调用方法的对象；您需要在Class类上查找getName方法ID，然后使用CallObjectMethod在jclass实例上调用它以获得jstring结果.

The jclass instance is your object on which a method will be invoked; you'll need to look up the getName method ID on the Class class, then invoke it on the jclass instance using CallObjectMethod to obtain a jstring result.

简而言之，是的，您只需调用getName函数并查看jstring结果.

So in short yes, you just call the getName function and look at the jstring result.

编辑

(消除了错误处理)

JNIEnv* env = ...;
// substitute your desired class's specifier for "java/lang/Class"...
jclass cls = env->FindClass("java/lang/Class"); 
jmethodID mid_getName = env->GetMethodID(cls, "getName", "()Ljava/lang/String;");
jstring name = env->CallObjectMethod(cls, mid_getName);

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