private static void GetUserObjectInformationNet(IntPtr hObj, int nIndex, out USEROBJECTFLAGS pvInfo, uint nLength, out uint lpnLengthNeeded)
{
if (!GetUserObjectInformation(hObj, nIndex, out pvInfo, nLength, out lpnLengthNeeded))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
private static unsafe bool IsInteractiveSessionWindows()
{
// Environment.UserInteractive is hard-coded to return true for POSIX and Windows platforms on .NET Core 2.x and 3.x.
// In .NET 5 the implementation on Windows has been 'fixed', but still POSIX versions always return true.
//
// This code is lifted from the .NET 5 targeting dotnet/runtime implementation for Windows:
// https://github.com/dotnet/runtime/blob/cf654f08fb0078a96a4e414a0d2eab5e6c069387/src/libraries/System.Private.CoreLib/src/System/Environment.Windows.cs#L125-L145
// Per documentation of GetProcessWindowStation, this handle should not be closed
IntPtr handle = User32.GetProcessWindowStation();
if (handle != IntPtr.Zero)
{
USEROBJECTFLAGS flags = default;
uint dummy = 0;
if (User32.GetUserObjectInformation(handle, User32.UOI_FLAGS, &flags,
(uint)sizeof(USEROBJECTFLAGS), ref dummy))
{
return((flags.dwFlags & User32.WSF_VISIBLE) != 0);
}
}
// If we can't determine, return true optimistically
// This will include cases like Windows Nano which do not expose WindowStations
return(true);
}
private static extern bool GetUserObjectInformation(IntPtr hObj, int nIndex, [Out] out USEROBJECTFLAGS pvInfo, uint nLength, out uint lpnLengthNeeded);
internal static extern bool GetUserObjectInformation(IntPtr hObj, int nIndex,
[MarshalAs(UnmanagedType.LPStruct)] USEROBJECTFLAGS pvBuffer, int nLength, ref int lpnLengthNeeded);
public static extern BOOL GetUserObjectInformationW(IntPtr hObj, UOI nIndex, ref USEROBJECTFLAGS pvBuffer, int nLength, ref int lpnLengthNeeded);