From 1307ad6eac7102928614786dcec0787db7cd5a5b Mon Sep 17 00:00:00 2001
From: dahall <dahall@byu.net>
Date: Mon, 20 Sep 2021 08:54:58 -0600
Subject: [PATCH] Added SHCIDS constants

---
 PInvoke/Shell32/ShObjIdl.IShellFolder.cs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/PInvoke/Shell32/ShObjIdl.IShellFolder.cs b/PInvoke/Shell32/ShObjIdl.IShellFolder.cs
index 4d436560..58d90240 100644
--- a/PInvoke/Shell32/ShObjIdl.IShellFolder.cs
+++ b/PInvoke/Shell32/ShObjIdl.IShellFolder.cs
@@ -11,6 +11,10 @@ namespace Vanara.PInvoke
 {
 	public static partial class Shell32
 	{
+		/// <summary> To extract the sorting rule, use a bitwise AND operator (&) to combine lParam with SHCIDS_COLUMNMASK (0X0000FFFF).
+		/// This operation masks off the upper sixteen bits of lParam. </summary>
+		public const SHCIDS SHCIDS_COLUMNMASK = (SHCIDS)0x0000FFFF;
+
 		/// <summary>Provides a set of flags for use with the CATEGORY_INFO structure.</summary>
 		// https://docs.microsoft.com/en-us/windows/win32/api/shobjidl_core/ne-shobjidl_core-categoryinfo_flags typedef enum
 		// CATEGORYINFO_FLAGS { CATINFO_NORMAL, CATINFO_COLLAPSED, CATINFO_HIDDEN, CATINFO_EXPANDED, CATINFO_NOHEADER,
@@ -83,6 +87,28 @@ namespace Vanara.PInvoke
 			FEM_NAVIGATION,
 		}
 
+		/// <summary>Flags that modify the sorting rule.</summary>
+		[PInvokeData("shobjidl_core.h")]
+		[Flags]
+		public enum SHCIDS : uint
+		{
+			/// <summary>
+			/// Version 5.0. When comparing by name, compare the system names but not the display names. When this flag is passed, the two
+			/// items are compared by whatever criteria the Shell folder determines are most efficient, as long as it implements a
+			/// consistent sort function. This flag is useful when comparing for equality or when the results of the sort are not displayed
+			/// to the user. This flag cannot be combined with other flags.
+			/// </summary>
+			SHCIDS_CANONICALONLY = 0x10000000,
+
+			/// <summary>
+			/// Version 5.0. Compare all the information contained in the ITEMIDLIST structure, not just the display names. This flag is
+			/// valid only for folder objects that support the IShellFolder2 interface. For instance, if the two items are files, the folder
+			/// should compare their names, sizes, file times, attributes, and any other information in the structures. If this flag is set,
+			/// the lower sixteen bits of lParam must be zero.
+			/// </summary>
+			SHCIDS_ALLFIELDS = 0x80000000
+		}
+
 		/// <summary>
 		/// Determines the types of items included in an enumeration. These values are used with the IShellFolder::EnumObjects method.
 		/// </summary>