Jiggler.cs

#region header

// MouseJiggle - Jiggler.cs
// 
// Alistair J. R. Young
// Arkane Systems
// 
// Copyright Arkane Systems 2012-2013.  All rights reserved.
// 
// Created: 2014-04-24 8:08 AM

#endregion

#region using

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

#endregion

namespace ArkaneSystems.MouseJiggle
{
    public static class Jiggler
    {
        internal const int INPUT_MOUSE = 0;
        internal const int MOUSEEVENTF_MOVE = 0x0001;

        [DllImport ("user32.dll", SetLastError = true)]
        private static extern uint SendInput (uint nInputs, ref INPUT pInputs, int cbSize);

        public static void Jiggle (int dx, int dy)
        {
            var inp = new INPUT
            {
                TYPE = Jiggler.INPUT_MOUSE,
                dx = dx,
                dy = dy,
                mouseData = 0,
                dwFlags = Jiggler.MOUSEEVENTF_MOVE,
                time = 0,
                dwExtraInfo = (IntPtr) 0
            };

            if (SendInput (1, ref inp, Marshal.SizeOf (inp)) != 1)
                throw new Win32Exception ();
        }
    }

    /* This is a kludge, presetting all this, but WTF. It works.
     * And for a program this trivial, who's bothered? */
    internal struct INPUT
    {
        public int TYPE;
        public int dx;
        public int dy;
        public int mouseData;
        public int dwFlags;
        public int time;
        public IntPtr dwExtraInfo;
    }
}