在linux获取并打印usb移动硬盘vid和pid

代码：

#include <libudev.h>#include <stdio.h>#include <stdlib.h>#include <locale.h>#include <unistd.h>int main (void){ struct udev *udev; struct udev_enumerate *enumerate; struct udev_list_entry *devices, *dev_list_entry; struct udev_device *dev;  /* Create the udev object */ udev = udev_new(); if (!udev) {  printf("Can't create udev\n");  exit(1); }  /* Create a list of the devices in the 'hidraw' subsystem. */ enumerate = udev_enumerate_new(udev); udev_enumerate_add_match_subsystem(enumerate, "block"); udev_enumerate_scan_devices(enumerate); devices = udev_enumerate_get_list_entry(enumerate); /* For each item enumerated, print out its information.    udev_list_entry_foreach is a macro which expands to    a loop. The loop will be executed for each member in    devices, setting dev_list_entry to a list entry    which contains the device's path in /sys. */ udev_list_entry_foreach(dev_list_entry, devices) {  const char *path;    /* Get the filename of the /sys entry for the device     and create a udev_device object (dev) representing it */  path = udev_list_entry_get_name(dev_list_entry);  dev = udev_device_new_from_syspath(udev, path);  /* usb_device_get_devnode() returns the path to the device node     itself in /dev. */  printf("Device Node Path: %s\n", udev_device_get_devnode(dev));  /* The device pointed to by dev contains information about     the hidraw device. In order to get information about the     USB device, get the parent device with the     subsystem/devtype pair of "usb"/"usb_device". This will     be several levels up the tree, but the function will find     it.*/  dev = udev_device_get_parent_with_subsystem_devtype(         dev,         "usb",         "usb_device");  if (!dev) {   printf("Unable to find parent usb device.");   exit(1);  }   /* From here, we can call get_sysattr_value() for each file     in the device's /sys entry. The strings passed into these     functions (idProduct, idVendor, serial, etc.) correspond     directly to the files in the directory which represents     the USB device. Note that USB strings are Unicode, UCS2     encoded, but the strings returned from     udev_device_get_sysattr_value() are UTF-8 encoded. */  printf("  VID/PID: %s %s\n",          udev_device_get_sysattr_value(dev,"idVendor"),          udev_device_get_sysattr_value(dev, "idProduct"));  printf("  %s\n  %s\n",          udev_device_get_sysattr_value(dev,"manufacturer"),          udev_device_get_sysattr_value(dev,"product"));  printf("  serial: %s\n",           udev_device_get_sysattr_value(dev, "serial"));  udev_device_unref(dev); } /* Free the enumerator object */ udev_enumerate_unref(enumerate); udev_unref(udev); return 0;       }

编译：g++ test.cpp -o test -ludev

运行：sudo ./test

输出：

Device Node Path: /dev/sdc
  VID/PID: 13fd 0840
  Generic
  External
  serial: 53423245343148374747414C
Device Node Path: /dev/sdc1
  VID/PID: 13fd 0840
  Generic
  External
  serial: 53423245343148374747414C
Device Node Path: /dev/sdc2
  VID/PID: 13fd 0840
  Generic
  External
  serial: 53423245343148374747414C
Device Node Path: /dev/sdc3
  VID/PID: 13fd 0840
  Generic
  External
  serial: 53423245343148374747414C
Device Node Path: /dev/sdc4
  VID/PID: 13fd 0840
  Generic
  External
  serial: 53423245343148374747414C
Device Node Path: /dev/sda