C#.Net的全局键盘钩子(Hook)技术

末蓝、 2021-11-30 01:24 974阅读 0赞

![None.gif][] using  System;  
![None.gif][] using  System.Windows.Forms;  
![None.gif][] using  System.Runtime.InteropServices;  
![None.gif][] using  System.Reflection;  
![None.gif][] namespace  HookDll  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][] public class HookDll  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][]  private KBDLLHOOKSTRUCT kbdllhs;   
![InBlock.gif][]  private IntPtr iHookHandle  =IntPtr.Zero;  
![InBlock.gif][]  private GCHandle \_hookProcHandle;  
![InBlock.gif][]  public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);  
![InBlock.gif][]  \[DllImport("user32.dll", CharSet=CharSet.Auto)\]  
![InBlock.gif][]  public static extern IntPtr SetWindowsHookEx(int hookid, HookProc pfnhook, IntPtr hinst, int threadid);  
![InBlock.gif][]    
![InBlock.gif][]  \[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)\]  
![InBlock.gif][]  public static extern bool UnhookWindowsHookEx(IntPtr hhook);  
![InBlock.gif][]   
![InBlock.gif][]  \[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)\]  
![InBlock.gif][]  public static extern IntPtr CallNextHookEx(IntPtr hhook, int code, IntPtr wparam, IntPtr lparam);  
![InBlock.gif][]  \[DllImport("kernel32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)\]  
![InBlock.gif][]  private static extern IntPtr GetModuleHandle(string lpModuleName);  
![InBlock.gif][]  \[DllImport("Kernel32.dll",EntryPoint="RtlMoveMemory")\]   
![InBlock.gif][]  public static extern void CopyMemory (ref KBDLLHOOKSTRUCT Source,IntPtr Destination,int Length);  
![InBlock.gif][]  
![InBlock.gif][]  private const int WH\_KEYBOARD = 13;  
![InBlock.gif][]    
![InBlock.gif][]  public void DisableKBDHook()  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]  ![dot.gif][]\{  
![InBlock.gif][]   try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]   ![dot.gif][]\{  
![InBlock.gif][]    if (iHookHandle!=IntPtr.Zero)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![InBlock.gif][]     UnhookWindowsHookEx(iHookHandle);  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]    \_hookProcHandle.Free();  
![InBlock.gif][]    iHookHandle = IntPtr.Zero;  
![ExpandedSubBlockEnd.gif][]   \}  
![InBlock.gif][]   catch  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]   ![dot.gif][]\{  
![InBlock.gif][]    return;  
![ExpandedSubBlockEnd.gif][]   \}  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  public void EnableKBDHook()  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]  ![dot.gif][]\{   
![InBlock.gif][]   HookProc hookProc = new HookProc(KBDDelegate);  
![InBlock.gif][]   \_hookProcHandle  = GCHandle.Alloc(hookProc);  
![InBlock.gif][]   iHookHandle   = SetWindowsHookEx(WH\_KEYBOARD, hookProc, GetModuleHandle("HookDll.dll"), 0);  
![InBlock.gif][]   if (iHookHandle == IntPtr.Zero)   
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]   ![dot.gif][]\{  
![InBlock.gif][]    throw new System.Exception("错误,钩子失败!");  
![ExpandedSubBlockEnd.gif][]   \}  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  public IntPtr KBDDelegate(int iCode , IntPtr wParam,IntPtr lParam)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]  ![dot.gif][]\{  
![InBlock.gif][]   kbdllhs    = new KBDLLHOOKSTRUCT();  
![InBlock.gif][]   CopyMemory(ref kbdllhs, lParam, 20);  
![InBlock.gif][]     
![InBlock.gif][]   //结果就在这里了^\_^  
![InBlock.gif][]   int iHookCode = kbdllhs.vkCode;  
![InBlock.gif][]   DisableKBDHook();  
![InBlock.gif][]   EnableKBDHook();  
![InBlock.gif][]   return CallNextHookEx(iHookHandle, iCode, wParam,lParam);  
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][] \[StructLayout(LayoutKind.Sequential)\]  
![InBlock.gif][] public struct KBDLLHOOKSTRUCT  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][]  public int vkCode;  
![InBlock.gif][]  public int scanCode;  
![InBlock.gif][]  public int flags;  
![InBlock.gif][]  public int time;  
![InBlock.gif][]  public int dwExtraInfo;  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedBlockEnd.gif][]\}

转载于:https://www.cnblogs.com/MaxWoods/archive/2008/05/22/1205221.html

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