Clipz - A Friendly Introduction to the Windows 7 Taskbar Features

namespace Clipz.NativeMethods
{
    using System;
    using System.Runtime.InteropServices;

    public static class User32
	{
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr SetClipboardViewer(IntPtr hWnd);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
        [DllImport("user32.dll")]
        public static extern int RegisterWindowMessage(string msgName);
        [DllImport("user32.dll")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        public static int ChangeModeMessage;
        public static int ClearContents;
        
        static User32()
        {
            ChangeModeMessage = RegisterWindowMessage("Clipz.ChangeModeMessage");
            ClearContents = RegisterWindowMessage("Clipz.ClearContents");
        }

        public static bool SendMessage(string windowTitle, int msgId, IntPtr wParam, IntPtr lParam)
        {
            var window = FindWindow(null, windowTitle);
            if (window == IntPtr.Zero) return false;

            var result = SendMessage(window, msgId, wParam, lParam);

            return result == IntPtr.Zero;
        }
	}
}