Python running MessageQueue.Peek via win32com, how to get timeout right?

Question

For starters, I would like to say if anyone can help here, you are incredible.

General Question

My Python program needs to interact with MSMQ. Basically, I want to peek at a queue, specifying a timeout if there's nothing in the queue.

However, despite my best efforts, I cannot get Peek() to wait out the timeout interval, when there's no value previously in the queue. Can you please point out what is missing from this code?

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My Current Code

Here is my code right now:

from socket import gethostname

import win32com.client
import pythoncom

import clr
clr.AddReference("System")
clr.AddReference("System.Messaging")
from System import TimeSpan
from System.Messaging import MessageQueue


# Source: [1]
# [1] https://learn.microsoft.com/en-us/previous-versions/windows/desktop/msmq/ms707027%28v%3dvs.85%29
MQ_DENY_NONE = 0x0
MQ_PEEK_ACCESS = 0x1
MQ_SEND_ACCESS = 0x2


# Set up queue
pythoncom.CoInitialize()
qinfo = win32com.client.Dispatch("MSMQ.MSMQQueueInfo")
qinfo.FormatName = f"direct=os:{gethostname()}\\PRIVATE$\\MyQueue"
queue = qinfo.Open(MQ_PEEK_ACCESS, MQ_DENY_NONE)

# Receive a value
timeout_sec = 1.0
timespan = TimeSpan.FromSeconds(timeout_sec)
label, body = "", ""
# TODO: timeout value does not appear working. It never waits when
#  there's no message
if queue.Peek(pythoncom.Empty, pythoncom.Empty, timespan):
    msg = queue.Receive() . # Blocking receive --> remove msg from the queue
    if msg is not None:
        label = msg.Label
        body = msg.Body

I run: inspect.getfullargspec(queue.Peek) and get:

FullArgSpec(args=['self', 'WantDestinationQueue', 'WantBody', 'ReceiveTimeout', 'WantConnectorType'], varargs=None, varkw=None, defaults=(<PyOleMissing object at 0x00000147F5D43BD0>, <PyOleMissing object at 0x00000147F5D43BD0>, <PyOleMissing object at 0x00000147F5D43BD0>, <PyOleMissing object at 0x00000147F5D43BD0>), kwonlyargs=[], kwonlydefaults=None, annotations={})

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Things I've Tried

This question: saying ReceiveTimeout=timespan doesn't seem to solve my problem.

Replacing pythoncom.Empty with pythoncom.Missing doesn't seem to work

This unanswered question seems very similar to mine

Answer 1

In the original question's comments, @PeterBrittain suggested to try just using:

an integer (in milliseconds) for their timeout

I got around to trying that out, and actually, it worked! I found float values to work as well. Here is some sample Python code:

timeout_sec = 1.0
queue.Peek(pythoncom.Empty, pythoncom.Empty, timeout_sec * 1000):

Thank you @PeterBrittain!