怎样屏蔽掉程序的ALT+F4解决办法

怎样屏蔽掉程序的ALT+F4
RT......刚遇到这种问题..感觉很茫然...望高手指点

[解决办法]
要是MFC的话

C/C++ code

void CTestDlg::OnSysCommand(UINT nID, LPARAM lParam){    if ((nID & 0xFFF0) == IDM_ABOUTBOX)    {        CAboutDlg dlgAbout;        dlgAbout.DoModal();    }    else    {        if( SC_CLOSE == nID )            return;        CDialog::OnSysCommand(nID, lParam);    }}
[解决办法]
C# code
using System;using System.Windows.Forms;class Test : Form{  Test()  {    Text = "请按Alt-F4键试试看";  }    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)  {    if ((int)msg.LParam == 0x203e0001)   // Alt-F4    {      DialogResult r = MessageBox.Show("您按下了Alt-F4键，是否要退出？", "提示",        MessageBoxButtons.YesNo, MessageBoxIcon.Question);      return r == DialogResult.No;    }    return base.ProcessCmdKey(ref msg, keyData);  }  [STAThread]  static void Main()  {    Application.Run(new Test());  }}
[解决办法]
底层键盘钩子


LRESULT CALLBACK LowLevelKeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) //CALLBACK _stdcall  
{

BOOL fEatKeystroke = FALSE;
PKBDLLHOOKSTRUCT p = NULL;
//MessageBox( NULL, _T("挂载钩子。"), _T("信息01"), MB_ICONINFORMATION );
if (nCode == HC_ACTION)  
{
p = (PKBDLLHOOKSTRUCT) lParam;
switch (wParam)  
{
case WM_KEYDOWN:  
// Backdoor to user information
if (p->vkCode == VK_F9)
{
//::MessageBox(NULL,"Let's make things better and better!\n","HQ Tech",MB_OK);
if(MessageBox(NULL,_T("Stop KeyMask and Exit"),_T("INFO"),MB_YESNO)==6)
{
StopKeyMask();
ExitProcess(0);
}
}
case WM_SYSKEYDOWN:
case WM_KEYUP:   
case WM_SYSKEYUP:  
fEatKeystroke = (p->vkCode == VK_LWIN) ||  // 屏蔽Win
// 屏蔽Alt+F4
((p->vkCode == VK_F4) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
// 屏蔽Ctrl+Esc
((p->vkCode == VK_ESCAPE) && ((GetKeyState(VK_CONTROL) & 0x8000) != 0));
break;
default:
break;
  }
}

  return (fEatKeystroke ? TRUE : CallNextHookEx(glhHook,nCode,wParam,lParam));

}

//安装及卸载钩子：

void  WINAPI StartKeyMask()
{
// 安装钩子
glhHook = SetWindowsHookEx(WH_KEYBOARD_LL,LowLevelKeyboardProc,hInst,0); //hInst需指向当前实例
}