win10相机注册表变化监控

// monitorhelper
public class RegeditMonitorHelper
{
    /// <summary>
    /// 检测注册表项名称变化，以及侦测注册表的创建和删除事件
    /// </summary>
    public static int REG_NOTIFY_CHANGE_NAME = 0x1;
    /// <summary>
    /// 侦测属性的变化
    /// </summary>
    public static int REG_NOTIFY_CHANGE_ATTRIBUTES = 0x2;
    /// <summary>
    /// 侦测上一次修改时间的变化
    /// </summary>
    public static int REG_NOTIFY_CHANGE_LAST_SET = 0x4;
    /// <summary>
    /// 侦测对安全特性的改动
    /// </summary>
    public static int REG_NOTIFY_CHANGE_SECURITY = 0x8;
    public static uint HKEY_CURRENT_USER = 0x80000001;
    public static uint HKEY_LOCAL_MACHINE = 0x80000002;
    public const UInt32 INFINITE = 0xFFFFFFFF;
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern UInt32 WaitForSingleObject(IntPtr hHandle, UInt32 dwMilliseconds);
    [DllImport("kernel32.dll")]
    public static extern uint WaitForMultipleObjects(uint nCount, IntPtr[] lpHandles, bool bWaitAll, uint dwMilliseconds);
    [DllImport("kernel32.dll")]
    public static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);
    [DllImport("Advapi32.dll")]
    public static extern int RegNotifyChangeKeyValue(IntPtr hKey, bool watchSubtree, int notifyFilter, IntPtr hEvent, bool asynchronous);
    [DllImport("advapi32.dll", EntryPoint = "RegOpenKeyEx")]
    public static extern int RegOpenKeyEx(uint hKey, string lpSubKey, RegOption dwOptions, RegSAM samDesired, ref IntPtr phkResult);
    [DllImport("kernel32.dll")]
    public static extern IntPtr SetEvent(IntPtr lpEventAttributes);

    [Flags]
    public enum RegOption
    {
        NonVolatile = 0x0,
        Volatile = 0x1,
        CreateLink = 0x2,
        BackupRestore = 0x4,
        OpenLink = 0x8
    }
    [Flags]
    public enum RegSAM
    {
        QueryValue = 0x0001,
        SetValue = 0x0002,
        CreateSubKey = 0x0004,
        EnumerateSubKeys = 0x0008,
        Notify = 0x0010,
        CreateLink = 0x0020,
        WOW64_32Key = 0x0200,
        WOW64_64Key = 0x0100,
        WOW64_Res = 0x0300,
        Read = 0x00020019,
        Write = 0x00020006,
        Execute = 0x00020019,
        AllAccess = 0x000f003f
    }
}

private const string szCamPath = @"SOFTWAREMicrosoftWindowsCurrentVersionCapabilityAccessManagerConsentStorewebcam";
// 注册表停止的点
IntPtr terminate1CamEvent = IntPtr.Zero;
private void CreateCameraMonitor()
{
    IntPtr mhModeNwKey = IntPtr.Zero;
    IntPtr modeEvent = IntPtr.Zero;
    IntPtr[] hEvents = null;
    try
    {
        int finx = RegeditMonitorHelper.RegOpenKeyEx(RegeditMonitorHelper.HKEY_LOCAL_MACHINE, szCamPath, 0,
            RegeditMonitorHelper.RegSAM.Read | RegeditMonitorHelper.RegSAM.QueryValue | RegeditMonitorHelper.RegSAM.WOW64_64Key,
            ref mhModeNwKey);
        if (finx == 0)        {
            int _regFilter = RegeditMonitorHelper.REG_NOTIFY_CHANGE_NAME |
            RegeditMonitorHelper.REG_NOTIFY_CHANGE_ATTRIBUTES |
            RegeditMonitorHelper.REG_NOTIFY_CHANGE_LAST_SET |
            RegeditMonitorHelper.REG_NOTIFY_CHANGE_SECURITY;
            modeEvent = RegeditMonitorHelper.CreateEvent(IntPtr.Zero, false, false, null);
            terminate1CamEvent = RegeditMonitorHelper.CreateEvent(IntPtr.Zero, false, false, null);
            hEvents = new IntPtr[] { modeEvent, terminate1CamEvent };
            while (true)
            {
                _logger.Info("Monitor thread--->webcam,CreateCameraMonitor111");
                RegeditMonitorHelper.RegNotifyChangeKeyValue(mhModeNwKey, true, _regFilter, modeEvent, true);
                uint trigger = RegeditMonitorHelper.WaitForMultipleObjects(2, hEvents, false, RegeditMonitorHelper.INFINITE);//无限等待modeEvent（注册表变化）和terminateEvent（关闭事件）反馈的结果，省的一直循环判断，浪费性能
                if (trigger == 0)
                {
                    _logger.Info($"UseWinCamera = {UseWinCamera}");
                    UseWinCamera = ResponseAgent.GetIntance().GetWinCameraSupport();// 获取当前状态
                    _logger.Info($"get cam page UseWinCamera = {UseWinCamera};");
                }
                else if (trigger == 1)
                {
                    _logger.Info("Monitor webcam stop monitor");
                    break;
                }
                else
                {
                    _logger.Info($"Monitor webcam Error trigger:{trigger}");
                    break;
                }
            }
        }
        else
        {
            _logger.Info($"MonitorAdjustDistance Open {szCamPath} ErrorCode:{finx}");
        }
    }
    catch (Exception ex)
    {
        _logger.Info($"CreateCameraMonitor111,{ex.Message}");
    }
}

// start monitor
System.Threading.Thread thread1 = new System.Threading.Thread(CreateCameraMonitor1);// 启动注册表监控线程
thread1.Start();


// stop monitor
RegeditMonitorHelper.SetEvent(terminate1CamEvent);