C++调用libusb，继电器（usbrelay）开发

usbrelay只提供了windows下的代码，最后项目要在linux下发布，所以只有重新写个驱动。

根据网上资料，修改之后：

1、先下载libusb1.0，我用的是libusb-1.0.20；

2、打开libusb-1.0.20\MS64\static，把libusb-1.0.lib文件加入源文件；

3、打开libusb-1.0.20\include\libusb-1.0，把libusb.h文件加入头文件；



MyDLL.h：

#define JNADLL extern "C" __declspec(dllexport)

JNADLL int add(int x, int y);
JNADLL int lock();
JNADLL int unlock();

MyDLL.cpp

// MyDLL.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
using namespace std;
#include "MyDLL.h"
#include "libusb.h"  // libusb head file
#include <stdio.h>
#include <sys/types.h>
#include <string.h>

#define VID 0x16c0      // get of lsusb
#define PID 0x05df      // get of lsusb

struct libusb_device_handle *devh = NULL;
int add(int x, int y)
{
return x + y;
}
int lock(){
/* usb init before libusb_open* */
int ret = libusb_init(NULL);
if (ret < 0) {
perror("libusb_init");
return ret;
}
/* end */

/* open device with vid and pid, must after libusb_init */
devh = libusb_open_device_with_vid_pid(NULL, VID, PID);
if (devh==NULL)
perror("Cannot open device\n");
printf("Device Opened\n");

/* end */

/* claim interface */
ret = libusb_claim_interface(devh, 0);
if (ret < 0) {
perror("libusb_claim_interface");
devh = NULL;
libusb_close(devh);
return ret;
}
/* end */

/* open device data */
unsigned char open_data[]={0x53, 0x32,0x4f, 0x44  ,0x32, 0x00, 0x00, 0x00};
//unsigned char open_data[8];
//memset(open_data, 0, sizeof(open_data));
libusb_control_transfer(devh, 0xa1, 0x01, 0x0300, 0x00, open_data, 0x08, 1000);
if ( 0 > libusb_control_transfer(devh, 0xa1, 0x01, 0x0300, 0x00, open_data, 0x08, 1000)) {
perror("libusb_control_transfer");
}
printf("receive data: %s\n", open_data);
int i = 0;
for(i = 0; i < 8; i++) {
printf("%02x\t", open_data[i]);
}
putchar(10);
/* end */

/* lock relay */
unsigned char lock_data[] = {0xff,0x01,0x00,0x00,0x00,0x00,0x00,0x00};
if (0 > libusb_control_transfer(devh, 0x21, 0x09, 0x0300, 0x00, lock_data, 0x08, 1000)) {
perror("libusb_control_transfer");
}
/* end */

/* delay */
Sleep(2);

/* release claim interface */
libusb_release_interface(devh, 0);
/* end */

/* close device */
libusb_close(devh);
Sleep (10);

return 1;
}

int unlock(){
/* usb init before libusb_open* */
int ret = libusb_init(NULL);
if (ret < 0) {
perror("libusb_init");
return ret;
}
/* end */

/* open device with vid and pid, must after libusb_init */
devh = libusb_open_device_with_vid_pid(NULL, VID, PID);
if (devh==NULL)
perror("Cannot open device\n");
printf("Device Opened\n");

/* end */

/* claim interface */
ret = libusb_claim_interface(devh, 0);
if (ret < 0) {
perror("libusb_claim_interface");
devh = NULL;
libusb_close(devh);
return ret;
}
/* end */

/* open device data */
unsigned char open_data[]={0x53, 0x32,0x4f, 0x44  ,0x32, 0x00, 0x00, 0x00};
//unsigned char open_data[8];
//memset(open_data, 0, sizeof(open_data));
libusb_control_transfer(devh, 0xa1, 0x01, 0x0300, 0x00, open_data, 0x08, 1000);
if ( 0 > libusb_control_transfer(devh, 0xa1, 0x01, 0x0300, 0x00, open_data, 0x08, 1000)) {
perror("libusb_control_transfer");
}
printf("receive data: %s\n", open_data);
int i = 0;
for(i = 0; i < 8; i++) {
printf("%02x\t", open_data[i]);
}
putchar(10);
/* end */

/* lock relay
unsigned char lock_data[] = {0xff,0x01,0x00,0x00,0x00,0x00,0x00,0x00};
if (0 > libusb_control_transfer(devh, 0x21, 0x09, 0x0300, 0x00, lock_data, 0x08, 1000)) {
perror("libusb_control_transfer");
}*/
/* end */

/* delay */
//Sleep(3000);

/* unlock relay */
unsigned char unlock_data[] = {0xfd, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
if (0 > libusb_control_transfer(devh, 0x21, 0x09, 0x0300, 0x00, unlock_data, 0x08, 1000)) {
perror("libusb_control_transfer");
}
/* end */

/* release claim interface */
libusb_release_interface(devh, 0);
/* end */

/* close device */
libusb_close(devh);
Sleep (10);
return 1;
}

最后运行成c++的动态库dll或者so文件。