Win Api 做个钩子

/******************************************************************************
Module:  DisableLowLevelKeys.cpp
Notices: Written 2000 Jeffrey Richter
******************************************************************************/

#define _WIN32_WINNT 0x0400
#include <Windows.h>

///////////////////////////////////////////////////////////////////////////////

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
   BOOL fEatKeystroke = FALSE;

   if (nCode == HC_ACTION)
   {
      switch (wParam)
   {
      case WM_KEYDOWN:  case WM_SYSKEYDOWN:
      case WM_KEYUP:    case WM_SYSKEYUP:
         PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) lParam;
         fEatKeystroke =
            ((p->vkCode == VK_TAB) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
            ((p->vkCode == VK_ESCAPE) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
            ((p->vkCode == VK_ESCAPE) && ((GetKeyState(VK_CONTROL) & 0x8000) != 0));
         break;
      }
   }
   return(fEatKeystroke ? 1 : CallNextHookEx(NULL, nCode, wParam, lParam));
}
///////////////////////////////////////////////////////////////////////////////
int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {

   // Install the low-level keyboard & mouse hooks
   HHOOK hhkLowLevelKybd  = SetWindowsHookEx(WH_KEYBOARD_LL,
      LowLevelKeyboardProc, hinstExe, 0);

   // Keep this app running until we're told to stop
   MessageBox(NULL,
      TEXT("Alt+Esc, Ctrl+Esc, and Alt+Tab are now disabled./n")
      TEXT("Click /"Ok/" to terminate this application and re-enable these keys."),
      TEXT("Disable Low-Level Keys"), MB_OK);

   UnhookWindowsHookEx(hhkLowLevelKybd);

   return(0);
}

///////////////////////////////// End Of File /////////////////////////////////