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KeyboardHookCommon.cs 9.8KB

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  1. using System;
  2. using System.Runtime.InteropServices;
  3. using System.Windows.Forms;
  4. namespace Common.system
  5. {
  6. /// <summary>
  7. /// 键盘钩子
  8. /// 创建人:赵耀
  9. /// 创建时间:2020年9月11日
  10. /// </summary>
  11. public class KeyboardHookCommon
  12. {
  13. /// <summary>
  14. /// 全局按键按下
  15. /// </summary>
  16. public event KeyEventHandler KeyDownEvent;
  17. /// <summary>
  18. /// 窗口按键按下
  19. /// </summary>
  20. public event KeyPressEventHandler KeyPressEvent;
  21. /// <summary>
  22. /// 全局按键抬起
  23. /// </summary>
  24. public event KeyEventHandler KeyUpEvent;
  25. public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
  26. private static int hKeyboardHook = 0; //声明键盘钩子处理的初始值
  27. //值在Microsoft SDK的Winuser.h里查询
  28. /// <summary>
  29. /// 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
  30. /// </summary>
  31. public const int WH_KEYBOARD_LL = 13;
  32. /// <summary>
  33. /// 声明KeyboardHookProcedure作为HookProc类型
  34. /// </summary>
  35. private HookProc KeyboardHookProcedure;
  36. /// <summary>
  37. /// 自己创建窗口按键
  38. /// </summary>
  39. private const int WM_KEYDOWN = 0x100;//KEYDOWN
  40. /// <summary>
  41. /// 窗口按键抬起
  42. /// </summary>
  43. private const int WM_KEYUP = 0x101;//KEYUP
  44. /// <summary>
  45. /// 全局系统按键
  46. /// </summary>
  47. private const int WM_SYSKEYDOWN = 0x104;//SYSKEYDOWN
  48. /// <summary>
  49. /// 全局按键抬起
  50. /// </summary>
  51. private const int WM_SYSKEYUP = 0x105;//SYSKEYUP
  52. //键盘结构
  53. [StructLayout(LayoutKind.Sequential)]
  54. public class KeyboardHookStruct
  55. {
  56. 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
  57. public int scanCode; // 指定的硬件扫描码的关键
  58. public int flags; // 键标志
  59. public int time; // 指定的时间戳记的这个讯息
  60. public int dwExtraInfo; // 指定额外信息相关的信息
  61. }
  62. //使用此功能,安装了一个钩子
  63. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
  64. public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
  65. //调用此函数卸载钩子
  66. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
  67. public static extern bool UnhookWindowsHookEx(int idHook);
  68. //使用此功能,通过信息钩子继续下一个钩子
  69. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
  70. public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);
  71. // 取得当前线程编号(线程钩子需要用到)
  72. [DllImport("kernel32.dll")]
  73. private static extern int GetCurrentThreadId();
  74. //使用WINDOWS API函数代替获取当前实例的函数,防止钩子失效
  75. [DllImport("kernel32.dll")]
  76. public static extern IntPtr GetModuleHandle(string name);
  77. //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
  78. [DllImport("user32")]
  79. public static extern int ToAscii(int uVirtKey, //[in] 指定虚拟关键代码进行翻译。
  80. 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)
  81. 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。
  82. byte[] lpwTransKey, // [out] 指针的缓冲区收到翻译字符或字符。
  83. int fuState); // [in] Specifies whether a menu is active. This parameter must be 1 if a menu is active, or 0 otherwise.
  84. //获取按键的状态
  85. [DllImport("user32")]
  86. public static extern int GetKeyboardState(byte[] pbKeyState);
  87. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
  88. private static extern short GetKeyState(int vKey);
  89. public void Start()
  90. {
  91. // 安装键盘钩子
  92. if (hKeyboardHook == 0)
  93. {
  94. KeyboardHookProcedure = new HookProc(KeyboardHookProc);
  95. hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, GetModuleHandle(System.Diagnostics.Process.GetCurrentProcess().MainModule.ModuleName), 0);
  96. //hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
  97. //************************************
  98. //键盘线程钩子
  99. //SetWindowsHookEx( 2,KeyboardHookProcedure, IntPtr.Zero, GetCurrentThreadId());//指定要监听的线程idGetCurrentThreadId(),
  100. //键盘全局钩子,需要引用空间(using System.Reflection;)
  101. //SetWindowsHookEx( 13,MouseHookProcedure,Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),0);
  102. //
  103. //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:
  104. //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,
  105. //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
  106. //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
  107. //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
  108. //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
  109. //如果为0,钩子子程与所有的线程关联,即为全局钩子
  110. //************************************
  111. //如果SetWindowsHookEx失败
  112. if (hKeyboardHook == 0)
  113. {
  114. Stop();
  115. throw new Exception("安装键盘钩子失败");
  116. }
  117. }
  118. }
  119. public void Stop()
  120. {
  121. bool retKeyboard = true;
  122. if (hKeyboardHook != 0)
  123. {
  124. retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
  125. hKeyboardHook = 0;
  126. }
  127. try
  128. {
  129. if (!(retKeyboard))
  130. {
  131. throw new Exception("卸载钩子失败!");
  132. }
  133. }
  134. catch (Exception)
  135. {
  136. }
  137. }
  138. ////接收SetWindowsHookEx返回值
  139. //private static int _hHookValue = 0;
  140. private int KeyboardHookProc(int nCode, int wParam, IntPtr lParam)
  141. {
  142. // 侦听键盘事件
  143. if ((nCode >= 0) && (KeyDownEvent != null || KeyUpEvent != null || KeyPressEvent != null))
  144. {
  145. KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
  146. // raise KeyDown
  147. if (KeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
  148. {
  149. Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
  150. KeyEventArgs e = new KeyEventArgs(keyData);
  151. KeyDownEvent(this, e);
  152. }
  153. //键盘按下
  154. if (KeyPressEvent != null && wParam == WM_KEYDOWN)
  155. {
  156. byte[] keyState = new byte[256];
  157. GetKeyboardState(keyState);
  158. byte[] inBuffer = new byte[2];
  159. if (ToAscii(MyKeyboardHookStruct.vkCode, MyKeyboardHookStruct.scanCode, keyState, inBuffer, MyKeyboardHookStruct.flags) == 1)
  160. {
  161. KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[0]);
  162. KeyPressEvent(this, e);
  163. }
  164. }
  165. // 键盘抬起
  166. if (KeyUpEvent != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
  167. {
  168. Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
  169. KeyEventArgs e = new KeyEventArgs(keyData);
  170. KeyUpEvent(this, e);
  171. }
  172. }
  173. //如果返回1,则结束消息,这个消息到此为止,不再传递。
  174. //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
  175. return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
  176. }
  177. ~KeyboardHookCommon()
  178. {
  179. Stop();
  180. }
  181. }
  182. }