Convert From C++ To Delphi

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////////////////////////////////////////////////////////////////
// MSDN Magazine -- September 2002
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual Studio 6.0 and Visual Studio .NET on Windows XP.
//
// This file implements the low-level keyboard hook that traps the task keys.
//
#define _WIN32_WINNT 0x0500 // for KBDLLHOOKSTRUCT
#include <afxwin.h>         // MFC core and standard components

#define DLLEXPORT __declspec(dllexport)

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

//////////////////
// App (DLL) object
//
class CTaskKeyHookDll : public CWinApp {
public:
      CTaskKeyHookDll()  { }
      ~CTaskKeyHookDll() { }
} MyDll;

////////////////
// The section is SHARED among all instances of this DLL.
// A low-level keyboard hook is always a system-wide hook.
//
#pragma data_seg (".mydata")
HHOOK g_hHookKbdLL = NULL; // hook handle
BOOL  g_bBeep = FALSE;            // beep on illegal key
#pragma data_seg ()
#pragma comment(linker, "/SECTION:.mydata,RWS") // tell linker: make it shared

/////////////////
// Low-level keyboard hook:
// Trap task-switching keys by returning without passing along.
//
LRESULT CALLBACK MyTaskKeyHookLL(int nCode, WPARAM wp, LPARAM lp)
{
      KBDLLHOOKSTRUCT *pkh = (KBDLLHOOKSTRUCT *) lp;

      if (nCode==HC_ACTION) {
            BOOL bCtrlKeyDown =
                  GetAsyncKeyState(VK_CONTROL)>>((sizeof(SHORT) * 8) - 1);

            if ((pkh->vkCode==VK_ESCAPE && bCtrlKeyDown) ||                            // Ctrl+Esc
                   (pkh->vkCode==VK_TAB && pkh->flags & LLKHF_ALTDOWN) ||   // Alt+TAB
                   (pkh->vkCode==VK_ESCAPE && pkh->flags & LLKHF_ALTDOWN)|| // Alt+Esc
                   (pkh->vkCode==VK_LWIN || pkh->vkCode==VK_RWIN)) { // Start Menu
                  if (g_bBeep && (wp==WM_SYSKEYDOWN||wp==WM_KEYDOWN))
                        MessageBeep(0); // only beep on downstroke if requested
                  return 1; // gobble it: go directly to jail, do not pass go
            }
      }
      return CallNextHookEx(g_hHookKbdLL, nCode, wp, lp);
}

//////////////////
// Are task keys disabled--ie, is hook installed?
// Note: This assumes there's no other hook that does the same thing!
//
DLLEXPORT BOOL AreTaskKeysDisabled()
{
      return g_hHookKbdLL != NULL;
}

//////////////////
// Disable task keys: install low-level kbd hook.
// Return whether currently disabled or not.
//
DLLEXPORT BOOL DisableTaskKeys(BOOL bDisable, BOOL bBeep)
{
      if (bDisable) {
            if (!g_hHookKbdLL) {
                  g_hHookKbdLL = SetWindowsHookEx(WH_KEYBOARD_LL,
                        MyTaskKeyHookLL, MyDll.m_hInstance, 0);
            }

      } else if (g_hHookKbdLL != NULL) {
            UnhookWindowsHookEx(g_hHookKbdLL);
            g_hHookKbdLL = NULL;
      }
      g_bBeep = bBeep;

      return AreTaskKeysDisabled();
}

This code is from microsft MSDN to Disable Task Keys ( Ctrl+Esc  &  Alt+Esc   &   Alt+Tab )