从Java调用C ++函数 [英] Calling C++ functions from Java

问题描述

我正在开发一个Java应用程序，其中我需要调用一些C ++函数（从Google Talk库libjingle）。目标是在Google App Engine（仅支持Python或Java）上运行它。

我如何做？

<你需要在你的java代码中定义 native 方法来实现你想在C ++中实现的任何东西，并且直接访问您的本地代码。然后在你的代码上运行 javah ，它将为你生成C头文件，你需要提供C ++实现。

与任何其他方法一样，您可以从Java代码调用的本地方法，仍然可以使用C ++编写的实现，并直接与任何其他本地库交谈。

然后，您需要设置java.library.path系统属性以包含您需要的共享C / C ++库：在这种情况下，将需要google库和您自己的JNI实现库。

I am developing a Java application in which I need to call some C++ functions (from Google Talk library libjingle) . The objective is to run it all on Google App Engine (which only supports Python or Java).

How can I do this?

解决方案

You need to define native methods in your java code for whatever you want to be implemented in C++ and directly access your native code. Then you run javah on your code and it will generate the C header files for you and you'll need to provide C++ implementations.

The native methods you can call from your Java code like any other methods and still they'll have their implementation written in C++ and talking to whatever other native library directly.

You then need to set the java.library.path system property to include the shared C/C++ libraries that you require: the google library and your own JNI implementation library would be required in this case.

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