private static void EnumMenuItems(
Shell32.IContextMenu cMenu,
HMENU hMenu,
List <Win32ContextMenuItem> menuItemsResult,
Func <string, bool> itemFilter = null)
{
var itemCount = User32.GetMenuItemCount(hMenu);
var mii = new User32.MENUITEMINFO();
mii.cbSize = (uint)Marshal.SizeOf(mii);
mii.fMask = User32.MenuItemInfoMask.MIIM_BITMAP
| User32.MenuItemInfoMask.MIIM_FTYPE
| User32.MenuItemInfoMask.MIIM_STRING
| User32.MenuItemInfoMask.MIIM_ID
| User32.MenuItemInfoMask.MIIM_SUBMENU;
for (uint ii = 0; ii < itemCount; ii++)
{
var menuItem = new ContextMenuItem();
var container = new SafeCoTaskMemString(512);
mii.dwTypeData = (IntPtr)container;
mii.cch = (uint)container.Capacity - 1; // https://devblogs.microsoft.com/oldnewthing/20040928-00/?p=37723
var retval = User32.GetMenuItemInfo(hMenu, ii, true, ref mii);
if (!retval)
{
container.Dispose();
continue;
}
menuItem.Type = (MenuItemType)mii.fType;
menuItem.ID = (int)(mii.wID - 1); // wID - idCmdFirst
if (menuItem.Type == MenuItemType.MFT_STRING)
{
Debug.WriteLine("Item {0} ({1}): {2}", ii, mii.wID, mii.dwTypeData);
menuItem.Label = mii.dwTypeData;
menuItem.CommandString = GetCommandString(cMenu, mii.wID - 1);
if (itemFilter != null && (itemFilter(menuItem.CommandString) || itemFilter(menuItem.Label)))
{
// Skip items implemented in UWP
container.Dispose();
continue;
}
if (mii.hbmpItem != HBITMAP.NULL && !Enum.IsDefined(typeof(HBITMAP_HMENU), ((IntPtr)mii.hbmpItem).ToInt64()))
{
using var bitmap = Win32API.GetBitmapFromHBitmap(mii.hbmpItem);
if (bitmap != null)
{
byte[] bitmapData = (byte[])new ImageConverter().ConvertTo(bitmap, typeof(byte[]));
menuItem.IconBase64 = Convert.ToBase64String(bitmapData, 0, bitmapData.Length);
}
}
if (mii.hSubMenu != HMENU.NULL)
{
Debug.WriteLine("Item {0}: has submenu", ii);
var subItems = new List <Win32ContextMenuItem>();
try
{
(cMenu as Shell32.IContextMenu2)?.HandleMenuMsg((uint)User32.WindowMessage.WM_INITMENUPOPUP, (IntPtr)mii.hSubMenu, new IntPtr(ii));
}
catch (NotImplementedException)
{
// Only for dynamic/owner drawn? (open with, etc)
}
EnumMenuItems(cMenu, mii.hSubMenu, subItems, itemFilter);
menuItem.SubItems = subItems;
Debug.WriteLine("Item {0}: done submenu", ii);
}
}
else
{
Debug.WriteLine("Item {0}: {1}", ii, mii.fType.ToString());
}
container.Dispose();
menuItemsResult.Add(menuItem);
}
}
