linux下用cpp获取所有usb设备的bus和device编号和id

可以使用libusb库来获取所有USB设备的bus和device编号和id。

以下是一个简单的示例代码，可以列出所有已连接的USB设备的详细信息：

#include <iostream>
#include <libusb-1.0/libusb.h>

int main(int argc, char** argv) {
    libusb_device **devs;
    libusb_context *ctx = NULL;

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

    // 获取所有已连接的USB设备列表
    ssize_t cnt = libusb_get_device_list(ctx, &devs);
    if (cnt < 0) {
        std::cerr << "Failed to get device list" << std::endl;
        return 1;
    }

    std::cout << "Number of USB devices: " << cnt << std::endl;

    // 遍历设备列表并打印每个设备的信息
    for (ssize_t i = 0; i < cnt; i++) {
        libusb_device *dev = devs[i];
        libusb_device_descriptor desc;

        // 获取设备描述符
        r = libusb_get_device_descriptor(dev, &desc);
        if (r < 0) {
            std::cerr << "Failed to get device descriptor" << std::endl;
            continue;
        }

        std::cout << "Device " << i << ": ";
        std::cout << "VendorID=" << desc.idVendor << ", ";
        std::cout << "ProductID=" << desc.idProduct << ", ";

        // 获取设备所在的bus和device编号
        uint8_t bus = libusb_get_bus_number(dev);
        uint8_t addr = libusb_get_device_address(dev);
        std::cout << "Bus=" << static_cast<int>(bus) << ", ";
        std::cout << "Device=" << static_cast<int>(addr) << std::endl;
    }

    // 释放设备列表
    libusb_free_device_list(devs, 1);

    // 关闭libusb库
    libusb_exit(ctx);
    return 0;
}

这个程序将会输出每个USB设备的VendorID、ProductID、Bus和Device编号。