隐私-摄像头

win11 对于隐私操作管理和控制比较严格，导致应用去控制时比较麻烦。采用一种投机取巧的方案，修改注册表，让用户无法修改。然后通过代码的方式控制注册表实现摄像头的权限的控制

通过修改注册表项

\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\default\Privacy\LetAppsAccessCamera

状态说明：

1.当value为0的时候

相机权限控制为可更改状态，权限会根据用户选择而变更

2.当value为1的时候

相机权限不可修改，且固定为打开状态

3.当value为2的时候

相机权限不可修改，且固定为关闭状态

但是只是通过修改这个项后，我们发现系统中设置界面没有同步更新过来

在win11环境下需要执行

C:\windows\system32\SystemSettingsAdminFlows.exe 这个应用（需要管理员身份运行，如果是代码控制，需要x64）

参数

SetCamSystemGlobal webcam 0 表示关闭

SetCamSystemGlobal webcam 1 表示开启

这个值暂时不知道在哪获取

直接上代码了

public class CameraSecurity 
   {
       private const string SystemSettingsAdminFlows = @"C:\Windows\System32\SystemSettingsAdminFlows.exe";
 
       private const string LetAppsAccessCamera = @"SOFTWARE\Microsoft\PolicyManager\default\Privacy\LetAppsAccessCamera";
       private const string Webcam = @"Software\Microsoft\Windows\CurrentVersion\CapabilityAccessManager\ConsentStore\webcam";
 
       /// <summary>
       /// 恢复到系统默认的操作方案
       ///  需要管理员权限
       /// </summary>
       public void ResetToSystemDefault()
       {
           SetPolicy(0x00000000);//全局允许
       }
 
       /// <summary>
       /// 全局允许访问
       ///  需要管理员权限
       /// </summary>
       public void AllowAccess()
       {
           SetPolicy(0x00000000);//全局允许
           SetSecurityItem("Allow");
           SetGlobalFlows(1);//全局通知
           SetPolicy(0x00000001);//全局打开
       }
       /// <summary>
       /// 全局禁止访问
       ///  需要管理员权限
       /// </summary>
       public void DenyAccess()
       {
           SetPolicy(0x00000000);//全局允许
           SetSecurityItem("Deny");
           SetGlobalFlows(0);//全局通知
           SetPolicy(0x00000002);//全局禁用
       }
 
       private RegistryKey LocalMachine => Environment.Is64BitOperatingSystem
               ? RegistryKey.OpenBaseKey(RegistryHive.LocalMachine,
                   RegistryView.Registry64)
               : Registry.LocalMachine;
 
 
       private RegistryKey CurrentUser => Environment.Is64BitOperatingSystem
           ? RegistryKey.OpenBaseKey(RegistryHive.CurrentUser,
               RegistryView.Registry64)
           : Registry.CurrentUser;
 
       /// <summary>
       /// 设置全局策略
       /// </summary>
       /// <param name="letAppsAccessCameraValue"></param>
       private void SetPolicy(int letAppsAccessCameraValue)
       {
           using (RegistryKey key = LocalMachine.OpenSubKey(LetAppsAccessCamera, true))
           {
               if (key == null)
               {
                   key.CreateSubKey(LetAppsAccessCamera, RegistryKeyPermissionCheck.ReadWriteSubTree);
                   using (RegistryKey newKey = LocalMachine.OpenSubKey(LetAppsAccessCamera, true))
                   {
                       newKey.SetValue("value", letAppsAccessCameraValue, RegistryValueKind.DWord);
                   }
                   return;
               }
               key.SetValue("value", letAppsAccessCameraValue, RegistryValueKind.DWord);
           }
       }
       /// <summary>
       /// 全局通知
       /// </summary>
       /// <param name="globalParam"></param>
       private void SetGlobalFlows(int globalParam)
       {
           if (File.Exists(SystemSettingsAdminFlows))
           {
               Process.Start(SystemSettingsAdminFlows, $"SetCamSystemGlobal webcam {globalParam}");
           }
       }
       /// <summary>
       /// 修改每一项
       /// </summary>
       /// <param name="webCamParam"></param>
       private void SetSecurityItem(string webCamParam)
       {
           using (RegistryKey key = CurrentUser.OpenSubKey(Webcam, true))
           {
               if (key == null) return;
               key.SetValue("Value", webCamParam);
               foreach (var appKeyName in key.GetSubKeyNames())
               {
                   if (string.IsNullOrWhiteSpace(appKeyName)) continue;
                   using (RegistryKey appKey = key.OpenSubKey(appKeyName, true))
                   {
                       if (appKey != null) appKey.SetValue("Value", webCamParam);
                   }
               }
           }
       }
   }