键盘钩子

#include <windows.h> #include "hook.h"     typedef LRESULT    (CALLBACK * HOOKPROC)(int code, WPARAM wParam, LPARAM lParam); typedef HHOOK      (WINAPI * SetWindowsHookFunc)(int, HOOKPROC, HINSTANCE, DWORD); typedef LRESULT    (WINAPI * UnhookWindowsHookFunc)(HHOOK);   typedef struct {     DWORD vkCode;     DWORD scanCode;     DWORD flags;     DWORD time;     ULONG_PTR dwExtraInfo; } KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;   #define WH_KEYBOARD_LL           20 #define HC_ACTION        0   extern HINSTANCE g_hInstance;   HHOOK m_hHook;   LRESULT CALLBACK LLKeyboardHookCallbackFunction(int nCode, WPARAM wParam, LPARAM lParam) {         printf("HOOK/n");        if(nCode >= HC_ACTION) {          if((wParam == WM_KEYDOWN) || (wParam == WM_SYSKEYDOWN)) {                                if(((KBDLLHOOKSTRUCT*)lParam)->vkCode == VK_TVOLUMEUP)  {                        printf("Hook VK_TVOLUMEUP/n");                        return TRUE;                    }                                    }         }           return FALSE; }   int DeactivateKBHook(void) {      BOOL ret = FALSE;       //从coredll.dll获取UnhookWindowsHookEx函数     HMODULE hLibrary = LoadLibrary(_T("coredll.dll"));     if(hLibrary == NULL)     {         goto Exit;     }       UnhookWindowsHookFunc pfnUnhookWindowsHook = (UnhookWindowsHookFunc)GetProcAddress(hLibrary, _T("UnhookWindowsHookEx"));     if(pfnUnhookWindowsHook == NULL)     {          goto Exit;      }        //调用UnhookWindowsHookEx解除按键钩子      pfnUnhookWindowsHook(m_hHook);        ret = TRUE;   Exit:      if (hLibrary != NULL)      {          FreeLibrary(hLibrary);      }       return ret;      }   int ActivateKBHook(void) {         BOOL ret = FALSE;       //从coredll.dll获取SetWindowsHookExW函数     HMODULE hLibrary = LoadLibrary(_T("coredll.dll"));     if(hLibrary == NULL)     {         goto Exit;     }       SetWindowsHookFunc pfnSetWindowHook = (SetWindowsHookFunc)GetProcAddress(hLibrary, _T("SetWindowsHookExW"));     if(pfnSetWindowHook == NULL)     {          goto Exit;      }        //调用SetWindowsHookExW注册按键钩子      m_hHook = pfnSetWindowHook(WH_KEYBOARD_LL, LLKeyboardHookCallbackFunction, g_hInst, 0);     if(m_hHook == NULL)     {         goto Exit;     }        ret = TRUE;   Exit:      if (hLibrary != NULL)      {          FreeLibrary(hLibrary);      }       return ret;   }