.NET Shell Extensions - Shell Context Menus

using System;
using System.Runtime.InteropServices;

namespace SharpShell.Interop
{
    /// <summary>
    /// Contains message information from a thread's message queue.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct MSG
    {
        /// <summary>
        /// A handle to the window whose window procedure receives the message. This member is NULL when the message is a thread message.
        /// </summary>
        public IntPtr hwnd;

        /// <summary>
        /// The message identifier. Applications can only use the low word; the high word is reserved by the system.
        /// </summary>
        public UInt32 message;

        /// <summary>
        /// Additional information about the message. The exact meaning depends on the value of the message member.
        /// </summary>
        public IntPtr wParam;

        /// <summary>
        /// Additional information about the message. The exact meaning depends on the value of the message member.
        /// </summary>
        public IntPtr lParam;

        /// <summary>
        /// The time at which the message was posted.
        /// </summary>
        public UInt32 time;

        /// <summary>
        /// The cursor position, in screen coordinates, when the message was posted.
        /// </summary>
        public POINT pt;
    }
}