Getting sounddevices from comport

gistfile1.txt

//	Copyright (c) 2024 David Hornemark
//
//	This software is provided 'as-is', without any express or implied warranty. In
//	no event will the authors be held liable for any damages arising from the use
//	of this software.
//
//	Permission is granted to anyone to use this software for any purpose,
//	including commercial applications, and to alter it and redistribute it freely,
//	subject to the following restrictions:
//
//	1. The origin of this software must not be misrepresented; you must not claim
//	that you wrote the original software. If you use this software in a product,
//	an acknowledgment in the product documentation would be appreciated but is not
//	required.
//
//	2. Altered source versions must be plainly marked as such, and must not be
//	misrepresented as being the original software.
//
//	3. This notice may not be removed or altered from any source distribution.
//
//  =============================================================================
//  This takes a comport, and returns a deviceNumber for the microphone and speaker GUID.
#region COMPORT HANDLING

public (Guid SpeakerGuid, int microphoneIndex) GetAudioDevicesForComPort(string comPort) // main method to get the ids needed.
{
    Guid speakerGuid = Guid.Empty;
    int microphoneIndex = 0;

    // Get PNPDeviceID for the given COM port
    (string VIP, string PID) = GetComPortPnpId(comPort);
    if (string.IsNullOrEmpty(VIP) || string.IsNullOrEmpty(PID))
    {
        Console.WriteLine($"Comport not found.");
        return (speakerGuid, microphoneIndex);
    }

    // Get sound devices linked to this COM port
    var SpeakerName = GetLinkedSoundDevices(VIP, PID, DataFlow.Render).Trim();
    var microphoneName = GetLinkedSoundDevices(VIP, PID, DataFlow.Capture).Trim(); 

    // Microphone
    for(int i = 0; i < WaveIn.DeviceCount; i++)
    {
        if (microphoneName == WaveIn.GetCapabilities(i).ProductName)
        {
            microphoneIndex = i;
            break;
        }
    }

    // Speaker
    foreach (var device in DirectSoundOut.Devices)
    {
        if (SpeakerName == device.Description)
        {
            speakerGuid = device.Guid;
            break;
        }
    }

    Console.WriteLine("Speakers: "+ speakerGuid);
    Console.WriteLine("Microphone: "+ microphoneIndex);
    return (speakerGuid, microphoneIndex);
}

(string VIP, string PID) GetComPortPnpId(string comPort) // This works.
{
    using (var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_SerialPort"))
    {
        foreach (ManagementObject obj in searcher.Get())
        {
            string deviceId = obj["DeviceID"]?.ToString();

            if (!string.IsNullOrEmpty(deviceId) && deviceId.Equals(comPort, StringComparison.OrdinalIgnoreCase))
            {
                return ExtractVendorAndProductId(obj["PNPDeviceID"].ToString());
            }
        }
    }
    return ("", "");
}

string GetLinkedSoundDevices(string VID, string PID, DataFlow dataflowType) // Getting the description or "name", they are the same anyways.
{
    var enumerator = new MMDeviceEnumerator();
    var devices = enumerator.EnumerateAudioEndPoints(dataflowType, DeviceState.Active);
    foreach (var device in devices)
    {
        var properties = device.Properties;

        (string VendorId, string ProductId) = ExtractVendorAndProductId(properties[4].Value.ToString());

        var guid = properties[12].Value.ToString();

        if (!string.IsNullOrEmpty(VendorId) && !string.IsNullOrEmpty(ProductId) && VendorId == VID && ProductId == PID && !string.IsNullOrEmpty(guid))
        {
            return device.FriendlyName;
        }
    }


    return "";
}

(string VendorId, string ProductId) ExtractVendorAndProductId(string pnpDeviceId) // just getting the id from the pnpDeviceID from the object searcher.
{
    string vendorId = null;
    string productId = null;

    try
    {
        // Look for VID and PID patterns in the PNPDeviceID
        var vidIndex = pnpDeviceId.IndexOf("VID_", StringComparison.OrdinalIgnoreCase);
        var pidIndex = pnpDeviceId.IndexOf("PID_", StringComparison.OrdinalIgnoreCase);

        if (vidIndex >= 0)
        {
            vendorId = pnpDeviceId.Substring(vidIndex + 4, 4); // Extract 4 characters after "VID_"
        }

        if (pidIndex >= 0)
        {
            productId = pnpDeviceId.Substring(pidIndex + 4, 4); // Extract 4 characters after "PID_"
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error extracting Vendor ID and Product ID: {ex.Message}");
    }

    return (vendorId, productId);
}

#endregion