/// <summary>
/// Returns the state of Focus Assist if available on this computer. Returns <see cref="FocusAssistState.FAILED"/> otherwise.
/// </summary>
/// <returns></returns>
public static FocusAssistState GetFocusAssistState()
{
try
{
// Focus Assist: Windows 10 build >= 17083
WNF_STATE_NAME WNF_SHEL_QUIETHOURS_ACTIVE_PROFILE_CHANGED = new WNF_STATE_NAME(0xA3BF1C75, 0xD83063E);
uint nBufferSize = (uint)Marshal.SizeOf(typeof(IntPtr));
IntPtr pStateName = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(WNF_STATE_NAME)));
Marshal.StructureToPtr(WNF_SHEL_QUIETHOURS_ACTIVE_PROFILE_CHANGED, pStateName, false);
bool success = NtQueryWnfStateData(pStateName, IntPtr.Zero, IntPtr.Zero, out uint nChangeStamp, out IntPtr pBuffer, ref nBufferSize) == 0;
Marshal.FreeHGlobal(pStateName);
if (success)
{
return((FocusAssistState)pBuffer);
}
}
catch { }
return(FocusAssistState.FAILED);
}
internal static extern int NtQueryWnfStateData([In] ref WNF_STATE_NAME StateName, IntPtr TypeId, IntPtr ExplicitScope, out uint ChangeStamp, [Out] IntPtr Buffer, ref uint BufferSize);
//internal static extern int NtUpdateWnfStateData(ref WNF_STATE_NAME StateName, IntPtr Buffer, uint Length, ref WNF_TYPE_ID TypeId, IntPtr ExplicitScope, uint MatchingChangeStamp, uint CheckStamp); internal static extern int NtUpdateWnfStateData(ref WNF_STATE_NAME StateName, IntPtr Buffer, uint Length, IntPtr TypeId, IntPtr ExplicitScope, uint MatchingChangeStamp, uint CheckStamp);
