java使用JNA调取C++动态库

JNA（Java Native Access）：提供一组Java工具类用于在运行期间动态访问系统本地库（native library：如Window的dll）而不需要编写任何Native/JNI代码。开发人员只要在一个java接口中描述目标native library的函数与结构，JNA将自动实现Java接口到native function的映射。

常用的指针对应：

Native Type	Java Type
void **	PointerByReference
void*	Pointer
char**	PointerByReference
char&	PointerByReference
char*	Pointer
int&	IntByReference
int*	IntByReference

 

程序示例：

 

public class TestSdkUtil {
    private static final Logger logger = LoggerFactory.getLogger(TestSdkUtil.class);
    protected static SdkUtil.CallBackDll CallBackDll = null;
    private static String stereo3d_server = "/lib/libstereo3d_server.so";

    /**
     * 接口类，用来和动态库建立联系，并声明动态库中的方法
     */
    public interface CallBackDll extends Library {
        SdkUtil.CallBackDll instance = (SdkUtil.CallBackDll) Native.loadLibrary(stereo3d_server, SdkUtil.CallBackDll.class);

        int getHandle_server(PointerByReference phandle, String severIndexAddr);

      
        int getHandleChar_server(PointerByReference phandle, String severIndexAddr);

        int Save_GunCameraObject(Pointer phandle, resolution_param_t resolution, 3d_pos_param_t pos, euler_angle_param_t angle, double fovy, Pointer filename, IntByReference id);

        int Modify_GunCameraObject(Pointer phandle, IntByReference id, resolution_param_t resolution, 3d_pos_param_t pos, euler_angle_param_t angle, double fovy, Pointer filename);

        int destroy_server(PointerByReference phandle);
    }

    public static void getInstance() {
        try {
            logger.info("==========读取libstereo3d_server.so文件开始==========");
            CallBackDll = SdkUtil.CallBackDll.instance;
            logger.info("==========读取libstereo3d_server.so文件开完成=========");
        } catch (Exception e) {
            logger.info("==========读取libstereo3d_server.so文件开失败=========" + e);
        }
    }


    public static ResultVO Save_GunCameraObject(PointerByReference phandle, resolution_param_t resolution, 3d_pos_param_t pos, euler_angle_param_t angle, double fovy, String filename, IntByReference id) {
        ResultVO vo = new ResultVO();

        try {
            if (CallBackDll == null) {
                getInstance();
            }
            Pointer fn = new Memory(1024);
            int result = CallBackDll.Save_GunCameraObject(phandle.getValue(), resolution, pos, angle, fovy, fn, id);
            vo.setId(id.getValue());
            vo.setFilename(fn.getString(0));
            vo.setCode(result);

        } catch (Exception e) {
        }

        return vo;
    }

    public static ResultVO Modify_GunCameraObject(PointerByReference phandle, int id, resolution_param_t resolution, 3d_pos_param_t pos, euler_angle_param_t angle, double fovy, String filename) {
        ResultVO vo = new ResultVO();

        try {
            if (CallBackDll == null) {
                getInstance();
            }

            IntByReference idRef = new IntByReference();
            idRef.setValue(id);
            Pointer fn = new Memory(1024);
            int result = CallBackDll.Modify_GunCameraObject(phandle.getValue(), idRef, resolution, pos, angle, fovy, fn);
            vo.setId(idRef.getValue());
            vo.setFilename(fn.getString(0));
            vo.setCode(result);
        } catch (Exception e) {
        }

        return vo;
    }


}

/**
 * 对象： 图像分辨率参数
 */
public class resolution_param_t extends Structure {
    public int width;
    public int height;

    @Override
    protected List getFieldOrder() {
        return Arrays.asList("width", "height");
    }
}
}