使用Win32应用程序禁用Windows 7中的CONTROL + ALT + DELETE和Windows(win)键

Question

我正在编写一个像a一样运行的应用程序,kiosk应该允许用户退出应用程序.在Windows 7,当他按下Win键或CTRL+ ALT+时DELETE,它会从程序中出来.我需要以编程方式禁用Ctrl+ ALT+ DELETE组合键和Win键Windows 7.

Answer 1

按Alt+ Tab也将切换出应用程序.Ctrl+ Esc是打开"开始"菜单的备用快捷方式.Alt+ Esc在运行的应用程序之间翻转.有许多不同的键序列可以做到这一点; Windows是多任务操作系统的自然结果.

要解决此问题,您将不得不安装可以捕获这些任务键的低级键盘钩子.钩子将监视用于切换任务的任何常用键序列.每当它检测到其中一个序列时,它将忽略输入而不将其传递给钩链.Paul DiLascia写了一篇文章,在2002年9月的MSDN杂志中解决了这个问题.你关心的部分大约在页面的中间开始,但为了方便起见,我在这里重印了它,以获得语法高亮的乐趣:

TaskKeyHook.h:

////////////////////////////////////////////////////////////////
// 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.
//
#define DLLIMPORT __declspec(dllimport)

DLLIMPORT BOOL DisableTaskKeys(BOOL bEnable, BOOL bBeep);
DLLIMPORT BOOL AreTaskKeysDisabled();

TaskKeyHook.cpp

////////////////////////////////////////////////////////////////
// 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)

//////////////////
// 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
          // Alt+TAB
          (pkh->vkCode==VK_TAB && pkh->flags & LLKHF_ALTDOWN) ||   
          // Alt+Esc
          (pkh->vkCode==VK_ESCAPE && pkh->flags & LLKHF_ALTDOWN)|| 
          (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();
}

他还提供了禁用任务栏的示例代码(从而阻止Windows键显示"开始"菜单)以及使用这些库的完整示例应用程序.

就防止Ctrl+ Alt+ Del(安全注意序列或SAS)而言,上述方法不起作用.原因是操作系统将SAS生成的硬件中断与其他密钥分开捕获,特别是为了防止程序挂钩序列和欺骗登录提示.您无法使用键盘钩子禁用此功能.我上面链接的文章确实在顶部详细介绍了这个要求,但这些策略只是经过测试,而且很可能只适用于Windows XP.本文提出的另一种方法是禁用任务管理器,但请注意,这不会阻止用户关闭系统等.正确的方法是编写键盘驱动程序.