Win32 Programmering..

Man kan også instalere en message hook som monitorerer keyboard beskeder.

Kode 

#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

HHOOK MouseHook;

LRESULT  LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
   if(nCode == HC_ACTION)
   {
      KBDLLHOOKSTRUCT *HookStruct = (KBDLLHOOKSTRUCT *)lParam;
      if(HookStruct->vkCode == VK_NEXT)
      {
         return TRUE;
      }
   }

  return CallNextHookEx(MouseHook, nCode, wParam, lParam);
}

void InstallHook(void)
{
  if(MouseHook)
    return;

  MouseHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC  )LowLevelKeyboardProc, GetModuleHandle(0), 0);
  if(!MouseHook)
  {
    MessageBox(0, "Failed to install Hook", "NG27", MB_OK);
    return;
  }
}

void UnInstallHook(void)
{
   if(MouseHook)
      UnhookWindowsHookEx(MouseHook);
   MouseHook = 0;
}

int main()
{
  InstallHook();
  MessageBox(0, "Hit Ok to close", "PageDown Remover", MB_OK);
  UnInstallHook();
  return 1;
}

Et lille program der instalerer en hook og fjerner PageDown:

Kode 

#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

HHOOK MouseHook;

LRESULT  LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
   if(nCode == HC_ACTION)
   {
      KBDLLHOOKSTRUCT *HookStruct = (KBDLLHOOKSTRUCT *)lParam;
      if(HookStruct->vkCode == VK_NEXT)
      {
         return TRUE;
      }
   }

  return CallNextHookEx(MouseHook, nCode, wParam, lParam);
}

void InstallHook(void)
{
  if(MouseHook)
    return;

  MouseHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC  )LowLevelKeyboardProc, GetModuleHandle(0), 0);
  if(!MouseHook)
  {
    MessageBox(0, "Failed to install Hook", "NG27", MB_OK);
    return;
  }
}

void UnInstallHook(void)
{
   if(MouseHook)
      UnhookWindowsHookEx(MouseHook);
   MouseHook = 0;
}

int main()
{
  InstallHook();
  MessageBox(0, "Hit Ok to close", "PageDown Remover", MB_OK);
  UnInstallHook();
  return 1;
}

Den korrete måde at løse det på er at skrive dette, før #include <windows.h>:

#define _WIN32_WINNT 0x0500