C# Signature:

[StructLayout(LayoutKind.Sequential)]
struct MENUITEMINFO {
   public uint cbSize;
   public uint fMask;
   public uint fType;
   public uint fState;
   public uint wID;
   public IntPtr hSubMenu;
   public IntPtr hbmpChecked;
   public IntPtr hbmpUnchecked;
   public IntPtr dwItemData; <- ItemData is up! by haijer
   public string dwTypeData;
   public uint cch;
   public IntPtr hbmpItem;

   // return the size of the structure
   public static uint sizeOf
   {
     get { return (uint)Marshal.SizeOf(typeof(MENUITEMINFO)); }
   }
}

VB.Net Signature:

<StructLayout(LayoutKind.Sequential)> _
Public Structure MENUITEMINFO
     Public cbSize As Integer
     Public fMask As Integer
     Public fType As Integer
     Public fState As Integer
     Public wID As Integer
     Public hSubMenu As IntPtr
     Public hbmpChecked As IntPtr
     Public hbmpUnchecked As IntPtr
     Public dwItemData As IntPtr
     Public dwTypeData As String
     Public cch As Integer
     Public hbmpItem As IntPtr
End Structure

User-Defined Field Types:

None.

Notes:

The c# MENUITEMINFO struct above did not work for me and kept resulting in empty or 'separator' menu items when used in conjunction with InsertMenuItem. Using the following struct, everything seems to work fine:

   [StructLayout(LayoutKind.Sequential)]
   struct MENUITEMINFO
   {
     public uint cbSize;
     public uint fMask;
     public uint fType;
     public uint fState;
     public int wID;
     public int /*HMENU*/ hSubMenu;
     public int /*HBITMAP*/ hbmpChecked;
     public int /*HBITMAP*/ hbmpUnchecked;
     public int /*ULONG_PTR*/ dwItemData;
     public String dwTypeData;
     public uint cch;
     public int /*HBITMAP*/ hbmpItem;
   }    

This won't work on a 64-bit platform, though, as far as I know. To work on a 64-bit platform, hSubMenu through dwItemData and hbmpItem should be IntPtr.

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