#include <unistd.h>
#include <stdio.h>
#include <libusb-1.0/libusb.h>

static void print_devs(libusb_device **devs)  
{  
    libusb_device *dev;  
    int i = 0;  
  
    while ((dev = devs[i++]) != NULL) {  
        struct libusb_device_descriptor desc;  
        int r = libusb_get_device_descriptor(dev, &desc);  
        if (r < 0) {  
            fprintf(stderr, "failed to get device descriptor");  
            return;  
        }  
  
        printf("%04x:%04x (bus %d, device %d)\n",  
            desc.idVendor, desc.idProduct,  
            libusb_get_bus_number(dev), libusb_get_device_address(dev));  
    }  
}  

int main()
{
	int r;
	ssize_t cnt;
	libusb_device **devs;                         //devices
	r=libusb_init(NULL);                          //init 初始化libusb
        if(r<0) {
            printf("failed to init libusb\n");
            return 1;
        }
	cnt = libusb_get_device_list(NULL,&devs);      //获取设备列表
        if (cnt < 0) {
            printf("failed to get device list\n");  
            return 1;
        }
	print_devs(devs);
	return 0;
}