JAVACPP infomap简单使用

？这个东西也太神了吧，一键生成java文件，自己写好c++和配置类就行了。

然后另一个需求是c++三方库，比如<eigen>啥的，这种东西也可以直接加在include path里，感觉无敌了。

首先我们写一个配置类

import org.bytedeco.javacpp.*;
import org.bytedeco.javacpp.annotation.*;
import org.bytedeco.javacpp.tools.*;

@Properties(
        value = @Platform(
                includepath = {"/path/to/include/","/usr/local/Cellar/eigen/3.4.0/include/eigen3"},
                include = {"NativeLibrary.h"}
        ),
        target = "NativeLibrary"
)
public class NativeLibraryConfig implements InfoMapper {
    public void map(InfoMap infoMap) {
        infoMap.put(new Info("SQUARE").cppTypes("double", "double"));
    }
}

再写个头文件

#include <string>
#include <iostream>
#include <Eigen/Dense>
#define SQUARE(x) x * x
using namespace Eigen;
class NativeClass {
        public:
            const std::string& get_property() { return property; }
            void set_property(const std::string& property) { this->property = property; }
            std::string property;
            double rm(){
                MatrixXd m = MatrixXd::Random(3,3);
                return m(0,0);
            }
};

然后运行这俩命令，就会自动生成java文件和.dylib文件

$ java -jar javacpp.jar NativeLibraryConfig.java
$ java -jar javacpp.jar NativeLibrary.java

然后写个测试类试一试

public class Test {
    public static void main(String[] args) {
        NativeLibrary.NativeClass l = new NativeLibrary.NativeClass();
        System.out.println(l.rm());
    }
}

完事儿了就