void TagManagedMenuItems(Menu menu, int tag)
{
MENUINFO info = new MENUINFO();
info.cbSize = Marshal.SizeOf(info);
info.fMask = MIM.MIM_MENUDATA;
info.dwMenuData = tag;
foreach (MenuItem item in menu.MenuItems)
{
ShellNativeMethods.SetMenuInfo(item.Handle, ref info);
}
}
void RemoveShellMenuItems(Menu menu)
{
const int tag = 0xAB;
List <int> remove = new List <int>();
int count = ShellNativeMethods.GetMenuItemCount(menu.Handle);
MENUINFO menuInfo = new MENUINFO();
MENUITEMINFO itemInfo = new MENUITEMINFO();
menuInfo.cbSize = Marshal.SizeOf(menuInfo);
menuInfo.fMask = MIM.MIM_MENUDATA;
itemInfo.cbSize = (uint)Marshal.SizeOf(itemInfo);
itemInfo.fMask = (uint)MIIM.MIIM_ID | (uint)MIIM.MIIM_SUBMENU;
// First, tag the managed menu items with an arbitary
// value (0xAB).
TagManagedMenuItems(menu, tag);
for (int n = 0; n < count; ++n)
{
ShellNativeMethods.GetMenuItemInfo(menu.Handle, n, true, ref itemInfo);
if (itemInfo.hSubMenu == IntPtr.Zero)
{
// If the item has no submenu we can't get the tag, so
// check its ID to determine if it was added by the shell.
if (itemInfo.wID >= m_CmdFirst)
{
remove.Add(n);
}
}
else
{
ShellNativeMethods.GetMenuInfo(itemInfo.hSubMenu, ref menuInfo);
if (menuInfo.dwMenuData != tag)
{
remove.Add(n);
}
}
}
// Remove the unmanaged menu items.
remove.Reverse();
foreach (int position in remove)
{
ShellNativeMethods.DeleteMenu(menu.Handle, position, MF.MF_BYPOSITION);
}
}
public static extern bool GetMenuInfo(IntPtr hmenu,
ref MENUINFO lpcmi);
