1 using System;
2 using System.Runtime.InteropServices;
3 using System.Windows.Forms;
4 //using System.Windows.Input;
5
6 namespace WpfApplication1
7 {
8 ///
9 /// 键盘钩子
10 /// [以下代码来自某网友，并非本人原创]
11 ///
12 class KeyboardHook
13 {
14 public event System.Windows.Forms.KeyEventHandler KeyDownEvent;
15 public event KeyPressEventHandler KeyPressEvent;
16 public event System.Windows.Forms.KeyEventHandler KeyUpEvent;
17
18 public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
19 static int hKeyboardHook = 0; //声明键盘钩子处理的初始值
20 //值在Microsoft SDK的Winuser.h里查询
21 // http://www.bianceng.cn/Programming/csharp/201410/45484.htm
22 public const int WH_KEYBOARD_LL = 13; //线程键盘钩子监听鼠标消息设为2，全局键盘监听鼠标消息设为13
23 HookProc KeyboardHookProcedure; //声明KeyboardHookProcedure作为HookProc类型
24 //键盘结构
25 [StructLayout(LayoutKind.Sequential)]
26 public class KeyboardHookStruct
27 {
28 public int vkCode; //定一个虚拟键码。该代码必须有一个价值的范围1至254
29 public int scanCode; // 指定的硬件扫描码的关键
30 public int flags; // 键标志
31 public int time; // 指定的时间戳记的这个讯息
32 public int dwExtraInfo; // 指定额外信息相关的信息
33 }
34 //使用此功能，安装了一个钩子
35 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
36 public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
37
38
39 //调用此函数卸载钩子
40 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
41 public static extern bool UnhookWindowsHookEx(int idHook);
42
43
44 //使用此功能，通过信息钩子继续下一个钩子
45 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
46 public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
47
48 // 取得当前线程编号（线程钩子需要用到）
49 [DllImport("kernel32.dll")]
50 static extern int GetCurrentThreadId();
51
52 //使用WINDOWS API函数代替获取当前实例的函数,防止钩子失效
53 [DllImport("kernel32.dll")]
54 public static extern IntPtr GetModuleHandle(string name);
55
56 public void Start()
57 {
58 // 安装键盘钩子
59 if (hKeyboardHook == 0)
60 {
61 KeyboardHookProcedure = new HookProc(KeyboardHookProc);
62 hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, GetModuleHandle(System.Diagnostics.Process.GetCurrentProcess().MainModule.ModuleName), 0);
63 //hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
64 //************************************
65 //键盘线程钩子
66 //SetWindowsHookEx( 2,KeyboardHookProcedure, IntPtr.Zero, GetCurrentThreadId());//指定要监听的线程idGetCurrentThreadId(),
67 //键盘全局钩子,需要引用空间(using System.Reflection;)
68 //SetWindowsHookEx( 13,MouseHookProcedure,Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),0);
69 //
70 //关于SetWindowsHookEx (int idHook, HookProc lpfn, IntPtr hInstance, int threadId)函数将钩子加入到钩子链表中，说明一下四个参数：
71 //idHook 钩子类型，即确定钩子监听何种消息，上面的代码中设为2，即监听键盘消息并且是线程钩子，如果是全局钩子监听键盘消息应设为13，
72 //线程钩子监听鼠标消息设为7，全局钩子监听鼠标消息设为14。lpfn 钩子子程的地址指针。如果dwThreadId参数为0 或是一个由别的进程创建的
73 //线程的标识，lpfn必须指向DLL中的钩子子程。 除此以外，lpfn可以指向当前进程的一段钩子子程代码。钩子函数的入口地址，当钩子钩到任何
74 //消息后便调用这个函数。hInstance应用程序实例的句柄。标识包含lpfn所指的子程的DLL。如果threadId 标识当前进程创建的一个线程，而且子
75 //程代码位于当前进程，hInstance必须为NULL。可以很简单的设定其为本应用程序的实例句柄。threaded 与安装的钩子子程相关联的线程的标识符
76 //如果为0，钩子子程与所有的线程关联，即为全局钩子
77 //************************************
78 //如果SetWindowsHookEx失败
79 if (hKeyboardHook == 0)
80 {
81 Stop();
82 throw new Exception("安装键盘钩子失败");
83 }
84 }
85 }
86 public void Stop()
87 {
88 bool retKeyboard = true;
89
90
91 if (hKeyboardHook != 0)
92 {
93 retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
94 hKeyboardHook = 0;
95 }
96
97 if (!(retKeyboard)) throw new Exception("卸载钩子失败！");
98 }
99 //ToAscii职能的转换指定的虚拟键码和键盘状态的相应字符或字符
100 [DllImport("user32")]
101 public static extern int ToAscii(int uVirtKey, //[in] 指定虚拟关键代码进行翻译。
102 int uScanCode, // [in] 指定的硬件扫描码的关键须翻译成英文。高阶位的这个值设定的关键，如果是（不压）
103 byte[] lpbKeyState, // [in] 指针，以256字节数组，包含当前键盘的状态。每个元素（字节）的数组包含状态的一个关键。如果高阶位的字节是一套，关键是下跌（按下）。在低比特，如果设置表明，关键是对切换。在此功能，只有肘位的CAPS LOCK键是相关的。在切换状态的NUM个锁和滚动锁定键被忽略。
104 byte[] lpwTransKey, // [out] 指针的缓冲区收到翻译字符或字符。
105 int fuState); // [in] Specifies whether a menu is active. This parameter must be 1 if a menu is active, or 0 otherwise.
106
107 //获取按键的状态
108 [DllImport("user32")]
109 public static extern int GetKeyboardState(byte[] pbKeyState);
110
111
112 [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
113 private static extern short GetKeyState(int vKey);
114
115 private const int WM_KEYDOWN = 0x100;//KEYDOWN
116 private const int WM_KEYUP = 0x101;//KEYUP
117 private const int WM_SYSKEYDOWN = 0x104;//SYSKEYDOWN
118 private const int WM_SYSKEYUP = 0x105;//SYSKEYUP
119
120 private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
121 {
122 // 侦听键盘事件
123 if ((nCode >= 0) && (KeyDownEvent != null || KeyUpEvent != null || KeyPressEvent != null))
124 {
125 KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
126 // raise KeyDown
127 if (KeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
128 {
129 Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
130 System.Windows.Forms.KeyEventArgs e = new System.Windows.Forms.KeyEventArgs(keyData);
131 KeyDownEvent(this, e);
132 }
133
134 //键盘按下
135 if (KeyPressEvent != null && wParam == WM_KEYDOWN)
136 {
137 byte[] keyState = new byte[256];
138 GetKeyboardState(keyState);
139
140 byte[] inBuffer = new byte[2];
141 if (ToAscii(MyKeyboardHookStruct.vkCode, MyKeyboardHookStruct.scanCode, keyState, inBuffer, MyKeyboardHookStruct.flags) == 1)
142 {
143 KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[0]);
144 KeyPressEvent(this, e);
145 }
146 }
147
148 // 键盘抬起
149 if (KeyUpEvent != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
150 {
151 Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
152 System.Windows.Forms.KeyEventArgs e = new System.Windows.Forms.KeyEventArgs(keyData);
153 KeyUpEvent(this, e);
154 }
155
156 }
157 //如果返回1，则结束消息，这个消息到此为止，不再传递。
158 //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
159 return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
160 }
161 ~KeyboardHook()
162 {
163 Stop();
164 }
165 }
166 }
