C++应用之libusb-(3)libusb简单使用

最新推荐文章于 2025-06-05 10:38:05 发布

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最新推荐文章于 2025-06-05 10:38:05 发布 · 2.8k 阅读

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#libusb

本文介绍了如何在C++中使用libusb库来获取设备信息。通过libusb_get_device_descriptor和libusb_get_port_numbers等函数，列出设备的供应商ID、产品ID、总线号、设备地址及路径。

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#include <stdio.h>

#include "libusb.h"

static void print_devs(libusb_device **devs)
{
	libusb_device *dev;
	int i = 0, j = 0;
	uint8_t path[8]; 

	while ((dev = devs[i++]) != NULL) {
		struct libusb_device_descriptor desc;
		int r = libusb_get_device_descriptor(dev, &desc);
		if (r < 0) {
			fprintf(stderr, "failed to get device descriptor");
			return;
		}

		printf("%04x:%04x (bus %d, device %d)",
			desc.idVendor, desc.idProduct,
			libusb_get_bus_number(dev), libusb_get_device_address(dev));

		r = libusb_get_port_numbers(dev, path, sizeof(path));
		if (r > 0) {
			printf(" path: %d", path[0]);
			for (j = 1; j < r; j++)
				printf(".%d", path[j]);
		}
		printf("\n");
	}
}

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

	r = libusb_init(NULL);
	if (r < 0)
		return r;

	cnt = libusb_get_device_list(NULL, &devs);
	if (cnt < 0)
		return (int) cnt;

	print_devs(devs);
	libusb_free_device_list(devs, 1);

	lib