libusb.cpp

#include <stdio.h>
#include "libusb.h"
#include<iostream>
using namespace std;
static void print_devs(libusb_device **devs)
{
  libusb_device *dev;
  int i = 0, j = 0;
  uint8_t path[8];

  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)",
	   desc.idVendor, desc.idProduct,
	   libusb_get_bus_number(dev), libusb_get_device_address(dev));

    r = libusb_get_port_numbers(dev, path, sizeof(path));
    if (r > 0) {
      printf(" path: %d", path[0]);
      for (j = 1; j < r; j++)
	printf(".%d", path[j]);
      
    }
    printf("\n");    
  }  
}

int main(void)
{
  libusb_device **devs;
  int r;
  ssize_t cnt;
  cout << __FUNCTION__<<"(), " << __LINE__ << endl;
  r = libusb_init(NULL);
  cout << __FUNCTION__<<"(), " << __LINE__ << endl;
  if(r < 0){
    cout << __FUNCTION__<<"(), " << __LINE__ << endl;
    return r;
  }

  cnt = libusb_get_device_list(NULL, &devs);
  if(cnt < 0){
    cout << __FUNCTION__<<"(), " << __LINE__ << endl;
    return (int) cnt;
  }
  print_devs(devs);
  libusb_free_device_list(devs, 1);
  libusb_exit(NULL);
  return 0;
}