接收从java到C ++的回调，并通过JNI在C ++中捕获java异常 [英] Receiving callbacks from java into C++ and catching java exceptions in C++ through JNI

问题描述

我们在C ++应用程序中通过JNI使用了一个java库（.JAR），因此我们可以从C ++调用Java类方法。但是，我们还希望将Java方法抛出的异常捕获到调用Java方法的C ++代码中。如何使用JNI执行此操作？



我们还面临的另一个挑战是，我们还希望从Java库接收回调到C ++中。具体来说我们想要做的是 - Java中有一个接口，这意味着它只有方法定义，没有实现。现在，我们希望通过JNI在C ++中实现Java的这个接口，所以接口的方法将用C ++代码实现，然后实现这个接口的C ++类的对象应作为参数发送到方法调用中。 C ++到Java，所以这就像从C ++到Java的回调类的注册。这样，只要Java代码需要向C ++代码发送通知，它就可以调用C ++注册类的方法。如何在JNI实现这一目标？



我尝试过：



我不能尝试，但有可能吗？

We have a java library (.JAR) that we are consuming in C++ application through JNI, so we are able to call Java class methods from C++. However, we would also like to catch exceptions thrown by the Java methods into our C++ code that is calling the Java methods. How to do this using JNI?

The other challenge we have is we would also like to receive callbacks from Java library into C++. Specifically what we would like to do is - There is an interface in Java, meaning it only has method definitions, no implementation. Now, we want to implement this interface of Java in C++ through JNI, so the methods of the interface will be implemented in C++ code and then the object of the C++ class that implements this interface should be sent as a parameter in a method call from C++ to Java, so this is like registration of callback class from C++ to Java. This way, whenever the Java code needs to send notifications to C++ code, it can call the methods of the C++ registered class. How to achieve this in JNI?

What I have tried:

I can not try but it is possible or not?

推荐答案

参见 Java技巧10：用Java实现回调例程JavaWorld [ ^ ]，这可能会有所帮助。

See Java Tip 10: Implement callback routines in Java | JavaWorld[^], which may help.

这篇关于接收从java到C ++的回调，并通过JNI在C ++中捕获java异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！