// 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);