libusb linux 实例

#include <stdio.h>
#include <libusb.h>

int main() {
    libusb_device **devs;
    libusb_device_handle *dev_handle;
    ssize_t cnt;
    int r;

    // 初始化libusb
    r = libusb_init(NULL);
    if (r < 0) {
        fprintf(stderr, "Init Error %d\n", r);
        return 1;
    }

    // 获取USB设备列表
    cnt = libusb_get_device_list(NULL, &devs);
    if (cnt < 0) {
        fprintf(stderr, "Get Device Error\n");
        libusb_exit(NULL);
        return 1;
    }

    // 遍历设备列表
    for (ssize_t i = 0; i < cnt; ++i) {
        struct libusb_device_descriptor desc;
        r = libusb_get_device_descriptor(devs[i], &desc);
        if (r < 0) {
            fprintf(stderr, "Failed to get device descriptor\n");
            continue;
        }

        printf("Device Descriptor:\n");
        printf("  bLength             %5d\n", desc.bLength);
        printf("  bDescriptorType     %5d\n", desc.bDescriptorType);
        printf("  bcdUSB              %2x.%02x\n", desc.bcdUSB >> 8, desc.bcdUSB & 0xff);
        printf("  idVendor           0x%04x\n", desc.idVendor);
        printf("  idProduct          0x%04x\n", desc.idProduct);
        printf("  bcdDevice          %2x.%02x\n", desc.bcdDevice >> 8, desc.bcdDevice & 0xff);
        printf("  iManufacturer       %5d\n", desc.iManufacturer);
        printf("  iProduct            %5d\n", desc.iProduct);
        printf("  iSerial             %5d\n", desc.iSerialNumber);
        printf("  bNumConfigurations %5d\n", desc.bNumConfigurations);
        printf("\n");
    }

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

    // 退出libusb
    libusb_exit(NULL);

    return 0;
}

gcc -o list_usb_devices list_usb_devices.c $(pkg-config --cflags --libs libusb-1.0)

./list_usb_devices