VC/MFC 键盘钩子,代码片断
在MFC程序中使用键盘钩子来获取按键消息,例程:
#include "StdAfx.h" #include "KeyboardHook.h" static HHOOK g_hHook = NULL; static CWnd* g_pWnd = NULL; BOOL CKeyboardHook::Init(HINSTANCE hInst, CWnd *pWnd) { g_pWnd = pWnd; g_hHook = SetWindowsHookEx(WH_KEYBOARD_LL,CKeyboardHook::KeyboardHookProc,hInst,NULL); return g_hHook == NULL ? FALSE : TRUE; } void CKeyboardHook::Close() { UnhookWindowsHookEx(g_hHook); } LRESULT CALLBACK CKeyboardHook::KeyboardHookProc(int code, WPARAM wParam, LPARAM lParam) { if(code == HC_ACTION) { PKBDLLHOOKSTRUCT pStruct = (PKBDLLHOOKSTRUCT)lParam; switch(pStruct->vkCode) { case 'a': case 'A': case 's': case 'S': case 'd': case 'D': case 'j': case 'J': case ' ': if (wParam == WM_KEYDOWN) { g_pWnd->PostMessage(WM_KEYDOWN, pStruct->vkCode, pStruct->scanCode); } return TRUE; break; default: return CallNextHookEx(g_hHook, code, wParam, lParam); } } return CallNextHookEx(g_hHook, code, wParam, lParam); }