using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using Microsoft.Office.Core;
using Microsoft.Office.Interop.Excel;
namespace Hooking
{
public class InterceptKeys
{
public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
private static Microsoft.Office.Tools.CustomTaskPane ctpRef = null;

//Declare the mouse hook constant.
//For other hook types, you can obtain these values from Winuser.h in the Microsoft SDK.

private const int WH_KEYBOARD = 2;
private const int HC_NOREMOVE = 3;
public static void SetHook()
{
_hookID = SetWindowsHookEx(WH_KEYBOARD, _proc, IntPtr.Zero, (uint)AppDomain.GetCurrentThreadId());
}
public static void ReleaseHook()
{
UnhookWindowsHookEx(_hookID);
}
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if ((nCode >= 0))
{
uint flags = (uint)lParam;
Keys keyData = (Keys)wParam;
if (nCode == HC_NOREMOVE)
{
if (Functions.IsKeyDown(Keys.ControlKey) && keyData == Keys.A)
{
MessageBox.Show("You pressed Ctrl+A");
}
}
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
IntPtr wParam, IntPtr lParam);
}
public class Functions
{
public static bool IsKeyDown(Keys keys)
{
return (GetKeyState((int)keys) & 0x8000) == 0x8000;
}
[DllImport("user32.dll")]
static extern short GetKeyState(int nVirtKey);
}
}

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