MDNSBrowseHandler示例代码

以下是使用MDNSBrowseHandler的示例代码：

import asyncio
import logging
import time

from zeroconf import ServiceBrowser, Zeroconf
from zeroconf import ServiceInfo, IPVersion

_LOGGER = logging.getLogger(__name__)


class MyListener:
    def remove_service(self, zeroconf, type, name):
        _LOGGER.info("Service %s removed", name)

    def add_service(self, zeroconf, type, name):
        info = zeroconf.get_service_info(type, name)
        if info:
            _LOGGER.info("Service %s added, service info: %s", name, info)
        else:
            _LOGGER.warning("Service %s added, but service info is None", name)


async def browse_services(zc: Zeroconf, typ: str, listener: MyListener):
    browser = ServiceBrowser(zc, typ, listener)
    while True:
        await asyncio.sleep(0.5)


async def main():
    zc = Zeroconf(ip_version=IPVersion.V4Only)
    listener = MyListener()
    service_type = "_http._tcp.local."
    task = asyncio.create_task(browse_services(zc, service_type, listener))

    try:
        while True:
            await asyncio.sleep(1)
    finally:
        task.cancel()
        await task


if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    asyncio.run(main())

这个示例代码可以使用zeroconf库来发现局域网内的HTTP服务。在这个示例中，我们定义了一个`MyListener`类，它实现了`remove_service`和`add_service`方法，在服务被添加和删除时调用。然后我们定义了一个`browse_services`的协程，使用`ServiceBrowser`类来浏览服务。最后，在`main`函数中，我们创建了一个Zeroconf实例，然后启动了一个无限循环的协程来等待服务的发现结果。