Pastebin

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;

#nullable disable
namespace Client.Helper;

internal class Camera
{
  public static readonly Guid CLSID_VideoInputDeviceCategory = new Guid("{860BB310-5D01-11d0-BD3B-00A0C911CE86}");
  public static readonly Guid CLSID_SystemDeviceEnum = new Guid("{62BE5D10-60EB-11d0-BD3B-00A0C911CE86}");
  public static readonly Guid IID_IPropertyBag = new Guid("{55272A00-42CB-11CE-8135-00AA004BB851}");

  public static bool havecamera() => Camera.FindDevices().Length != 0;

  public static string[] FindDevices()
  {
    return Camera.GetFiltes(Camera.CLSID_VideoInputDeviceCategory).ToArray();
  }

  public static List<string> GetFiltes(Guid category)
  {
    List<string> result = new List<string>();
    Camera.EnumMonikers(category, (Func<IMoniker, Camera.IPropertyBag, bool>) ((moniker, prop) =>
    {
      object Var = (object) null;
      prop.Read("FriendlyName", ref Var, 0);
      result.Add((string) Var);
      return false;
    }));
    return result;
  }

  private static void EnumMonikers(Guid category, Func<IMoniker, Camera.IPropertyBag, bool> func)
  {
    IEnumMoniker ppEnumMoniker = (IEnumMoniker) null;
    Camera.ICreateDevEnum o1 = (Camera.ICreateDevEnum) null;
    try
    {
      o1 = (Camera.ICreateDevEnum) Activator.CreateInstance(Type.GetTypeFromCLSID(Camera.CLSID_SystemDeviceEnum));
      o1.CreateClassEnumerator(ref category, ref ppEnumMoniker, 0);
      if (ppEnumMoniker == null)
        return;
      IMoniker[] rgelt = new IMoniker[1];
      IntPtr zero = IntPtr.Zero;
      while (ppEnumMoniker.Next(rgelt.Length, rgelt, zero) == 0)
      {
        IMoniker o2 = rgelt[0];
        object ppvObj = (object) null;
        Guid iidIpropertyBag = Camera.IID_IPropertyBag;
        o2.BindToStorage((IBindCtx) null, (IMoniker) null, ref iidIpropertyBag, out ppvObj);
        Camera.IPropertyBag o3 = (Camera.IPropertyBag) ppvObj;
        try
        {
          if (func(o2, o3))
            break;
        }
        finally
        {
          Marshal.ReleaseComObject((object) o3);
          if (o2 != null)
            Marshal.ReleaseComObject((object) o2);
        }
      }
    }
    finally
    {
      if (ppEnumMoniker != null)
        Marshal.ReleaseComObject((object) ppEnumMoniker);
      if (o1 != null)
        Marshal.ReleaseComObject((object) o1);
    }
  }

  [ComVisible(true)]
  [Guid("29840822-5B84-11D0-BD3B-00A0C911CE86")]
  [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
  [ComImport]
  public interface ICreateDevEnum
  {
    int CreateClassEnumerator([In] ref Guid pType, [In, Out] ref IEnumMoniker ppEnumMoniker, [In] int dwFlags);
  }

  [ComVisible(true)]
  [Guid("55272A00-42CB-11CE-8135-00AA004BB851")]
  [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
  [ComImport]
  public interface IPropertyBag
  {
    int Read([MarshalAs(UnmanagedType.LPWStr)] string PropName, ref object Var, int ErrorLog);

    int Write(string PropName, ref object Var);
  }
}