qt调用libusb linux

#include <QCoreApplication>
#include <libusb.h>
#include <iostream>

void printdev(libusb_device *dev) {
    libusb_device_descriptor desc;
    int r = libusb_get_device_descriptor(dev, &desc);
    if (r < 0) {
        std::cerr << "Failed to read device descriptor" << std::endl;
        return;
    }
    std::cout << "Vendor ID: " << std::hex << desc.idVendor << std::endl;
    std::cout << "Product ID: " << std::hex << desc.idProduct << std::endl;
}

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);

    libusb_context *ctx;
    int r = libusb_init(&ctx);
    if (r < 0) {
        std::cerr << "Failed to initialize libusb" << std::endl;
        return 1;
    }

    libusb_device **devs;
    ssize_t cnt = libusb_get_device_list(ctx, &devs);
    if (cnt < 0) {
        std::cerr << "Failed to get device list" << std::endl;
        libusb_exit(ctx);
        return 1;
    }

    for (ssize_t i = 0; i < cnt; ++i) {
        printdev(devs[i]);
        libusb_unref_device(devs[i]);
    }
    libusb_free_device_list(devs, 1);
    libusb_exit(ctx);

    return a.exec();
}