如何创建一个扩展夜风通过对已经包裹库？ [英] How to create an extension to already wrapped library via SWIG?

问题描述

我有一个图书馆。它通过痛饮挤包。我想创建一个插件来扩展它。插件需要从已经包裹库类运行有类似无效的init（oldT岁）; 。图书馆是由Java和C＃中使用。现在，这个插件也将在那里被使用。图书馆和插件是独立的动态链接库。如何高大痛饮，我已经有一个 oldT 键入包裹创建插件绑定时？

I have a library. It is wraped via SWIG. I want to create a plugin to extend it. Plugin requires a class from already wrapped library to run having something like void init( oldT old);. Library is used from Java and c#. Now this plugin also will be used from there. Library and plugin are separate dll's. How to tall SWIG that I already have that oldT type wrapped when creating binding for plugin?

推荐答案

您正在寻找 ％的进口 在你的插件的.i文件。你需要要么有（或假的）原始.i文件从现有的库。

You're looking for %import in the .i file of your plugin. You'll need to either have (or fake) the original .i file from the existing library.

一个MCVE基于一个简单的头文件针对Java的（但没有具体到Java）：

A MCVE targeting Java (but nothing specific to Java) based on a simple header file:

#ifndef EXISTING_H
#define EXISTING_H
struct oldT {
};
#endif

原来的库接口文件：

The original library interface file:

%module existing

%{
#include "existing.h"
%}

%include "existing.h"

使用，在地方，我们可以建立原始库：

With that in place we can build the original library:

swig2.0 -Wall -java existing.i 
gcc -Wall -Wextra -shared -o libexisting.so -I/usr/lib/jvm/default-java/include -I/usr/lib/jvm/default-java/include/linux existing_wrap.c 

这libexisting.so生成一些Java的 oldT 键入

现在我们写的插件接口文件：

Now we write our plugin interface file:

%module plugin

%import "existing.i"
%{
#include "existing.h"
%}

%inline %{
  void plugin_init(struct oldT old) {
    printf("Hello\n");
  }
%}

这里的关键是使用％的进口带来的，而不是产生包装code表示要扩展已经包裹在库中的组件

The key thing here is the use of %import to bring in, but not generate wrapper code for the components already wrapped in the library you want to extend.

同样，我们可以编译如下：

Again we can compile this:

swig2.0 -Wall -java plugin.i
gcc -Wall -Wextra -shared -o libplugin.so -I/usr/lib/jvm/default-java/include -I/usr/lib/jvm/default-java/include/linux plugin_wrap.c

（请注意，您的实际情况下，您需要做反对现有的库的共享库在某些情况下链接此）

(Note that for your real scenario you made need to link this against the shared library of the existing library in some scenarios)

然后对其进行测试我写了一个Java少量的：

Then to test it I wrote a tiny amount of Java:

public class run {
  public static void main(String[] argv) {
    System.loadLibrary("existing");
    System.loadLibrary("plugin");
    plugin.plugin_init(new oldT());
  }
}

这点我编译和运行：

Which I compiled and ran with:

javac run.java
LD_LIBRARY_PATH=. java run
Hello

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