Carnac.Logic/Win32Methods.cs

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using System;
using System.Runtime.InteropServices;

namespace Carnac.Logic
{
    public static class Win32Methods
    {

        public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        // ReSharper disable InconsistentNaming
        //

        public const int WH_KEYBOARD_LL = 13;
        public const int WM_KEYDOWN = 256;
        public const int WM_KEYUP = 257;
        public const int WM_SYSKEYUP = 261;
        public const int WM_SYSKEYDOWN = 260;
        public const int WS_EX_TRANSPARENT = 0x00000020;
        public  const int GWL_EXSTYLE = (-20);

        //
        // ReSharper restore InconsistentNaming

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern IntPtr GetModuleHandle(string lpModuleName);

        [DllImport("user32.dll")]
        static extern int GetWindowLong(IntPtr hwnd, int index);

        [DllImport("user32.dll")]
        static extern int SetWindowLong(IntPtr hwnd, int index, int newStyle);

        public static void SetWindowExTransparent(IntPtr hwnd)
        {
            var extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
            SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT);
        }
    }
}