using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
namespace HookLib
{
public static class HookHelper
{
public delegate int HookProc(
int nCode,
IntPtr wParam,
IntPtr lParam
);
public static int HookCallback( int nCode, IntPtr wParam, IntPtr lParam)
{
if (IntPtr .Zero == HookPtr || null == HookId)
{
return 0;
}
if (nCode >= 0)
{
if (null != HookCallbackEvent)
{
return HookCallbackEvent(nCode, wParam, lParam);
}
}
return CallNextHookEx(HookPtr, HookId.Value, wParam, lParam);
}
public static IntPtr SetWindowsHookEx()
{
if (null == HookId)
{
throw new Exception( "You must set HookId first!" );
}
HookPtr = SetWindowsHookEx(
HookId.Value,
KeyboardCallback,
Instance,
0);
return HookPtr;
}
public static bool UnhookWindowsHookEx()
{
if (null == HookPtr || IntPtr.Zero == HookPtr)
{
throw new Exception( "HookPtr is null");
}
return UnhookWindowsHookEx(HookPtr);
}
public static int WH_KEYBOARD_LL = 13;
public static IntPtr HookPtr;
public static int? HookId = WH_KEYBOARD_LL;
public static event HookProc HookCallbackEvent;
public static HookProc KeyboardCallback = new HookProc (HookHelper.HookCallback);
public static IntPtr Instance = Marshal.GetHINSTANCE(Assembly .GetAssembly(typeof( HookHelper)).GetModules()[0]);
#region Win32API
[ DllImport("User32.dll" , CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall,
SetLastError = true)]
public static extern IntPtr SetWindowsHookEx(
int idHook,
HookProc lpfn, //如果是全局钩子，回调函数应该就写在dll内
IntPtr hMod, //如果是全局钩子，应该是包含lpfn方法的dll句柄，注意此句柄要保持生命周期
int dwThreadId //如果是全局钩子，置为0；否则应该是保护lpfn方法的进程id
);
[ DllImport("User32.dll" , CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall,
SetLastError = true)]
public static extern int CallNextHookEx(
IntPtr hhk,
int nCode,
IntPtr wParam,
IntPtr lParam
);
[ DllImport("User32.dll" , CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall,
SetLastError = true)]
public static extern bool UnhookWindowsHookEx(
IntPtr hhk
);
[ DllImport("Kernel32.dll" , CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall)]
public static extern int GetLastError();
#endregion
}
}
