激活Focus Assist Windows 10以编程方式设置C＃

Question

我正在构建C＃WPF应用程序，并希望能够以编程方式启用和禁用Windows系统功能Focus Assist。

我尝试研究如何以编程方式控制此功能，但看不到它的任何内容（可能是因为它是一项新的系统功能）。我看过有关使用该Windows.System库的说明，但是对焦辅助似乎并没有分开

谁能指出我正确的方向？

Answer 1

我想出了以下内容。在 Windows 10 22H2 19045.3803 中测试。

笔记：

• 在 Windows Focus Assist 设置下， 或When I'm duplicating my display必须When I'm playing a game设置为On，具体取决于您打算以编程方式激活的模式。

• 为了打开聚焦辅助，您有时需要先发出命令将其关闭（即使它已经关闭）。为了获得最佳效果，请始终关闭然后再打开。

   using System.Runtime.InteropServices;
  
   while(true)
   {
  
       var focusAssistMode = Console.ReadLine() == "on" ? FocusAssistMode.Fullscreen : FocusAssistMode.Off;
  
       var result = FocusAssistHelper.SetFocusAssistMode(focusAssistMode);
  
       if (result == 0)
       {
           Console.WriteLine("Success");
       }
       else
       {
           Console.WriteLine($"Failed with error code {result}");
       };
  
   }
  
   public static class FocusAssistHelper
   {
  
       [DllImport("ntdll.dll", SetLastError = true)]
       static extern int ZwUpdateWnfStateData(
           ref ulong StateName,
           IntPtr Buffer,
           int Length,
           Guid TypeId,
           IntPtr ExplicitScope,
           uint MatchingChangeStamp,
           bool CheckStamp
       );
  
       [DllImport("ntdll.dll", SetLastError = true)]
       static extern int ZwQueryWnfStateData(
           ref ulong StateName,
           Guid TypeId,
           IntPtr ExplicitScope,
           out uint ChangeStamp,
           IntPtr Buffer,
           ref int BufferSize
       );
  
       const ulong WNF_SHEL_QUIET_MOMENT_SHELL_MODE_CHANGED = 0xd83063ea3bf5075UL;
  
       public static int GetFocusAssistMode(out FocusAssistMode mode)
       {
  
           var stateName = WNF_SHEL_QUIET_MOMENT_SHELL_MODE_CHANGED;
  
           int bufferSize = 4;
           var bufferPtr = Marshal.AllocHGlobal(bufferSize);
  
           var result = ZwQueryWnfStateData(ref stateName, Guid.Empty, IntPtr.Zero, out _, bufferPtr, ref bufferSize);
  
           if (result == 0)
           {
  
               var modeAsByteArray = new byte[bufferSize];
  
               Marshal.Copy(bufferPtr, modeAsByteArray, 0, modeAsByteArray.Length);
  
               mode = (FocusAssistMode)BitConverter.ToUInt32(modeAsByteArray);
  
           }
           else
           {
               mode = FocusAssistMode.Off;
           }
  
           return result;
  
       }
  
       public static int SetFocusAssistMode(FocusAssistMode mode)
       {
  
           var stateName = WNF_SHEL_QUIET_MOMENT_SHELL_MODE_CHANGED;
  
           var modeAsByteArray = BitConverter.GetBytes((uint)mode);
  
           var bufferPtr = Marshal.AllocHGlobal(modeAsByteArray.Length);
  
           try
           {
  
               Marshal.Copy(modeAsByteArray, 0, bufferPtr, modeAsByteArray.Length);
  
               return ZwUpdateWnfStateData(ref stateName, bufferPtr, modeAsByteArray.Length, Guid.Empty, IntPtr.Zero, 0, false);
  
           }
           finally
           {
               Marshal.FreeHGlobal(bufferPtr);
           }
  
       }
  
   }
  
   public enum FocusAssistMode : uint
   {
       Off = 0,
       Game = 1,
       Fullscreen = 2,
   }