将c2d com从azure IotHub转换为python脚本时，已弃用的方法

Question

message = client.receive_message()

这段代码现在已被弃用，在搜索解决方案时，似乎只有我一个人有这个问题。 我得到这个警告：

DeprecatedWarning: receive_message is deprecated as of 2.3.0. We recommend that you use the .on_message_received property to set a handler instead of message = client.receive_message()

如果你有一个可能的解决方案，请张贴在这里。 我正在运行最新的python 3.9和最新的Azure IoT设备库

Answer 1

您正在尝试使用不再受支持的方法（因为它已被弃用）。正如错误消息所说，处理C2D消息的正确方法是使用事件处理程序。有一个很好的例子here

您将感兴趣的部分是：

  # define behavior for receiving a message
  # NOTE: this could be a function or a coroutine
  def message_received_handler(message):
      print("the data in the message received was ")
      print(message.data)
      print("custom properties are")
      print(message.custom_properties)
      print("content Type: {0}".format(message.content_type))
      print("")

  # set the mesage received handler on the client
  device_client.on_message_received = message_received_handler