Cannot prevent cmd window from popping up when calling python script (.Net MAUI) #2316

Shrp77 · 2024-01-13T01:39:48Z

Shrp77
Jan 13, 2024

Environment

Pythonnet version: 3.0.3
Python version: 3.10
Operating System: Windows 11
.NET Runtime: .Net MAUI

Details

Describe what you were trying to get done.

I am trying to execute some python scripts silently. I have exposed C# methods for progress to be reported back to the .Net MAUI app. When I get to the execution of the python script (pyScript.detect_intial_silence()) the cmd prompt opens up - not text is written to it.

How can I execute the script without the cmd prompt popping up?
What commands did you run to trigger this issue? If you can provide a
Minimal, Complete, and Verifiable example
this will help us understand the issue.

    public IResult<TimeSpan> DetectInitialSilence(string filename)
    {
        try
        {
            PythonEngine.Initialize();
            using (Py.GIL())
            {
                SetProgressMaxDelegate progressMaxDelegate = SetMaxProgress;
                var pySetMaxProgress = progressMaxDelegate.ToPython();

                ProgressUpdateDelegate progressDelegate = OnProgressUpdate;
                var pyProgress = progressDelegate.ToPython();

                dynamic sys = Py.Import("sys");
                sys.path.append(AppDomain.CurrentDomain.BaseDirectory);

                sys.SetAttr("set_progress_max", pySetMaxProgress);
                sys.SetAttr("on_progress_update", pyProgress);

                PythonEngine.PythonHome = AppDomain.CurrentDomain.BaseDirectory;
                PythonEngine.PythonPath = Path.Combine(PythonEngine.PythonHome, "Lib");
                dynamic pyScript = Py.Import("Scripts.detect_initial_silence");
                try
                {
                    PyObject result = pyScript.detect_initial_silence(filename);

                    int silenceDuration = result.As<int>();
                    return Result.Successful(TimeSpan.FromMilliseconds(silenceDuration));
                }
                catch (Exception e)
                {
                    return Result.Failed<TimeSpan>(e, "Python script execution failed");
                }
                finally
                {
                    pyScript.Dispose();
                    sys.Dispose();
                }
            }
        }
        finally
        {
            // This call causes an exception due to the BinaryFormatter not being allowed
            // to run (security hazard).
            // PythonEngine.Shutdown();
        }
    }

import sys
from pydub import AudioSegment
from pydub.silence import detect_nonsilent

def detect_initial_silence(file_path, silence_threshold=-50.0, chunk_size=10):
    """
    Detects the silence at the beginning of an audio file.

    :param file_path: path to the audio file
    :param silence_threshold: the upper bound for what is considered silence in dB
    :param chunk_size: size of a chunk to use in millisenconds
    :return: duration of silence in milliseconds
    """

    # Load the audio file
    song = AudioSegment.from_file(file_path, format="mp3")

    if hasattr(sys, 'set_progress_max'):
        sys.set_progress_max(file_path, len(song))

    # Detect non-silent chunks
    nonsilent_chunks = []
    for start_i in range(0, len(song), chunk_size):
        end_i = start_i + chunk_size
        if end_i >= len(song):
            end_i = len(song)
        chunk = song[start_i:end_i]
        if not (chunk.dBFS < silence_threshold):
            nonsilent_chunks.append([start_i, end_i])
        if hasattr(sys, 'on_progress_update'):
            sys.on_progress_update(file_path, start_i)

    # Duration of the first sound chunk's start is the duration of the initial silence
    silence_duration = nonsilent_chunks[0][0] if nonsilent_chunks else len(song)

    if hasattr(sys, 'on_progress_update'):
        sys.on_progress_update(file_path, len(song));

    return silence_duration

budij · 2024-06-06T23:05:00Z

budij
Jun 6, 2024

I had the same issue with this commented out code above:

        // This call causes an exception due to the BinaryFormatter not being allowed
        // to run (security hazard).
        // PythonEngine.Shutdown();

The way I fixed it is to enable the unsafe binary formatter in the csproj file. Just put it in the first property group, and it stops it from throwing exception.
<EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>

But, it would be nice if the library can be fixed so that it doesn't use binary formatter anymore though.

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Cannot prevent cmd window from popping up when calling python script (.Net MAUI) #2316

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Shrp77 Jan 13, 2024

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Replies: 1 comment

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budij Jun 6, 2024

Shrp77
Jan 13, 2024

budij
Jun 6, 2024