NativeMethods.cs

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace Shikashi
{
    [StructLayout(LayoutKind.Sequential)]
    struct POINTAPI { public int x; public int y; }

    [StructLayout(LayoutKind.Sequential)]
    struct CURSORINFO { public int cbSize; public int flags; public IntPtr hCursor; public POINTAPI ptScreenPos; }

    class NativeMethods
    {
        // Registers a hot key with Windows.
        [DllImport("user32.dll")]
        internal static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

        // Unregisters the hot key with Windows.
        [DllImport("user32.dll")]
        internal static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        [DllImport("user32.dll")]
        internal static extern bool GetCursorInfo(out CURSORINFO pci);

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern bool DrawIconEx(IntPtr hdc, int xLeft, int yTop, IntPtr hIcon, int cxWidth, int cyHeight, int istepIfAniCur, IntPtr hbrFlickerFreeDraw, int diFlags);

        [DllImport("user32.dll")]
        internal static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        internal static extern bool GetWindowRect(IntPtr hwnd, ref Rectangle rectangle);
    }
}