JNA使用

JNA与C对应的数据类型：

注意：

       使用byte[]对应C++中的char* 可以返回函数执行的结果值

一、添加JNA需要的jar包

     1、jna.jar

     2、platform.jar

 

二、编写调用DLL的类

package rfid;

import com.sun.jna.*;
import com.sun.jna.ptr.*;

public interface MasterRD extends Library {

    MasterRD instance = (MasterRD) Native.loadLibrary("MasterRD",
            MasterRD.class);

    int lib_ver(IntByReference ver);

    int rf_init_com(int port, NativeLong baud);

    int rf_beep(short idev, byte msec);

    int rf_request(short idev, byte model, short[] tagtype);

    int rf_anticoll(short idev, byte bcnt, byte[] psnr, byte[] prlength);

    int rf_select(short idev, byte[] psnr, byte srclen, byte[] size);

    int rf_M1_authentication2(short idev, byte model, byte block, byte[] key);

    int rf_M1_read(short idev, byte block, byte[] pdata, byte[] plen);

    int rf_M1_write(short idev, byte block, byte[] data);

    int rf_light(short idev, byte color);

    int rf_ClosePort();
}

其中MasterRD为MasterRD.dll 文件名，对应于DLL中的函数如下【部分举例】：

/*
*    提取DLL接口
*/
#ifndef _EXPORT_FUNC_H_
#define _EXPORT_FUNC_H_

#include <Windows.h>

int (WINAPI* lib_ver)(unsigned int *nVer);

int (WINAPI * des_encrypt)(unsigned char *szOut,unsigned char *szIn , unsigned int inlen,unsigned char *key,unsigned int keylen);

int (WINAPI * des_decrypt)(unsigned char *szOut,unsigned char *szIn , unsigned int inlen,unsigned char *key,unsigned int keylen);

int (WINAPI * rf_init_com)(int port,long baud);

int (WINAPI * rf_init_device_number)(unsigned short icdev);

int (WINAPI * rf_get_device_number)(unsigned short *Icdev);

int (WINAPI * rf_get_model)(unsigned short icdev,unsigned short *Version);

int (WINAPI * rf_get_snr)(unsigned short icdev,unsigned char *Snr);

int (WINAPI * rf_beep)(unsigned short icdev,unsigned char msec);

#endif

 

三、使用

MasterRD.instance.lib_ver()  ….