1 using System;
  2 using System.Collections.Generic;
  3 using UnityEngine;
  4 using System.Runtime.InteropServices;
  5 using System.Windows.Forms;
  6
  7 namespace Neo
  8 {
  9     public class KeybordHook
 10     {
 11         public struct KeyMSG
 12         {
 13             public int vkCode;
 14             public int scanCode;
 15             public int flags;
 16             public int time;
 17             public int dwExtraInfo;
 18         }
 19
 20         #region 第一步:声明API函数
 21         //使用钩子，需要使用WindowsAPI函数，所以要先声明这些API函数。
 22
 23         // 安装钩子
 24         [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
 25         public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
 26
 27         // 卸载钩子
 28         [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
 29         public static extern bool UnhookWindowsHookEx(int idHook);
 30
 31         // 继续下一个钩子
 32         [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
 33         public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
 34
 35         // 取得当前线程编号
 36         [DllImport("kernel32.dll")]
 37         static extern int GetCurrentThreadId();
 38
 39         #endregion
 40
 41         #region 第二步：声明，定义委托
 42         public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
 43
 44         static int hKeyboardHook = 0;//如果hKeyboardHook不为0则说明钩子安装成功
 45
 46         HookProc KeyboardHookProcedure;
 47         #endregion
 48
 49         #region 第三步：编写钩子子程
 50         //钩子子程就是钩子所要做的事情。
 51         private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr IParam)
 52         {
 53             if (nCode >= 0)
 54             {
 55                 int ret = 1;
 56                 //这一步是将IParam的信息提取到自定义的struct里面。注释掉是因为在我这里会导致unity莫名退出，很奇怪
 57                 //KeyMSG m = (KeyMSG)Marshal.PtrToStructure(IParam, typeof(KeyMSG));
 58                 if (IParam.ToInt32() > 0)
 59                 {
 60                     Debug.Log("键盘按下：" + wParam);
 61                 }
 62                 else if (IParam.ToInt32() < 0)
 63                 {
 64                     Debug.Log("键盘抬起：" + wParam);
 65                 }
 66
 67                 if (ret == 1) CallNextHookEx(hKeyboardHook, nCode, wParam, IParam);//出于礼貌，如果要丢弃按键消息，最好先让后续的钩子处理该消息
 68                 return ret;//0：按键消息将继续传递给windows消息处理函数  1：直接丢弃按键消息，不会传给windows消息处理函数
 69             }
 70             return CallNextHookEx(hKeyboardHook, nCode, wParam, IParam);
 71         }
 72         #endregion
 73
 74         #region 第四步：正式启用钩子
 75         //钩子安装
 76         public void HookStart()
 77         {
 78             if (hKeyboardHook == 0)
 79             {
 80                 //创建HookProc实例
 81                 KeyboardHookProcedure = new HookProc(KeyboardHookProc);
 82                 //设置钩子,第一个参数2表示此钩子为线程钩子
 83                 hKeyboardHook = SetWindowsHookEx(2, KeyboardHookProcedure, IntPtr.Zero, GetCurrentThreadId());
 84
 85                 if (hKeyboardHook == 0)
 86                 {
 87                     //终止钩子
 88                     throw new Exception("安装钩子失败");
 89                 }
 90                 else
 91                 {
 92                     Debug.Log("安装钩子成功");
 93                 }
 94             }
 95         }
 96
 97         //钩子卸载
 98         public void HookStop()
 99         {
100             bool retKeyboard = true;
101             if (hKeyboardHook != 0)
102             {
103                 retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
104                 hKeyboardHook = 0;
105             }
106             if (!retKeyboard)
107                 throw new Exception("钩子卸载失败");
108
109         }
110         #endregion
111     }
112 }