获取usb设备VID&PID

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "libusb.h"

int dumu_vid_pid(void)
{
    int res = -1;
    libusb_context *context = NULL;
    libusb_device **list = NULL;
    int rc = 0;
    ssize_t count = 0;

    rc = libusb_init(&context);
    assert(rc == 0);

    count = libusb_get_device_list(context, &list);
    assert(rc == 0);

    for(size_t idx = 0; idx < count; ++idx){
        libusb_device *device = list[idx];
        struct libusb_device_descriptor desc = {0};

        rc = libusb_get_device_descriptor(device, &desc);

        assert(rc == 0);

        printf("Vendor : Device = %04x:%04x\n", desc.idVendor, desc.idProduct);
    }

    return 0;
}