vc编写挂机锁

       凡是去过网吧的朋友，对挂机锁一定不陌生，鼠标被限定，键盘关键按键被屏蔽。那么这是如何实现的呢，我们也来写一个吧。

// lockDlg.cpp : implementation file//#include "stdafx.h"#include "lock.h"#include "lockDlg.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endif#define HKCU HKEY_CURRENT_USER/////////////////////////////////////////////////////////////////////////////// CAboutDlg dialog used for App Abouttypedef struct tagKBDLLHOOKSTRUCT { DWORD vkCode; DWORD scanCode; DWORD flags; DWORD time; DWORD dwExtraInfo;} KBDLLHOOKSTRUCT, FAR *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;#define WH_KEYBOARD_LL 13HHOOK hook;HKEY hk;LPCTSTR KEY_DisableTaskMgr ="Software//Microsoft//Windows//CurrentVersion//Policies//System";LPCTSTR VAL_DisableTaskMgr = "DisableTaskMgr";LRESULT CALLBACK key(int ncode,WPARAM w,LPARAM l){if (ncode>=0){KBDLLHOOKSTRUCT* m=(KBDLLHOOKSTRUCT *) l;if( m->vkCode==VK_TAB || GetAsyncKeyState(VK_CONTROL) || m->vkCode==VK_LWIN || m->vkCode==VK_RWIN || m->vkCode==VK_ESCAPE || m->vkCode==VK_F4){return 1;}}return ::CallNextHookEx(hook,ncode,w,l);}class CAboutDlg : public CDialog{public:CAboutDlg();// Dialog Data//{{AFX_DATA(CAboutDlg)enum { IDD = IDD_ABOUTBOX };//}}AFX_DATA// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CAboutDlg)protected:virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support//}}AFX_VIRTUAL// Implementationprotected://{{AFX_MSG(CAboutDlg)//}}AFX_MSGDECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD){//{{AFX_DATA_INIT(CAboutDlg)//}}AFX_DATA_INIT}void CAboutDlg::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CAboutDlg)//}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)//{{AFX_MSG_MAP(CAboutDlg)// No message handlers//}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CLockDlg dialogCLockDlg::CLockDlg(CWnd* pParent /*=NULL*/): CDialog(CLockDlg::IDD, pParent){//{{AFX_DATA_INIT(CLockDlg)// NOTE: the ClassWizard will add member initialization here//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);}void CLockDlg::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CLockDlg)DDX_Control(pDX, IDC_EDIT1, edit);//}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CLockDlg, CDialog)//{{AFX_MSG_MAP(CLockDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTTON1, OnButton1)ON_BN_CLICKED(IDC_BUTTON2, OnButton2)ON_WM_TIMER()//}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CLockDlg message handlersBOOL CLockDlg::OnInitDialog(){CDialog::OnInitDialog();// Add "About..." menu item to system menu.// IDM_ABOUTBOX must be in the system command range.ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL){CString strAboutMenu;strAboutMenu.LoadString(IDS_ABOUTBOX);if (!strAboutMenu.IsEmpty()){pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);}}// Set the icon for this dialog. The framework does this automatically// when the application's main window is not a dialogSetIcon(m_hIcon, TRUE);// Set big iconSetIcon(m_hIcon, FALSE);// Set small iconreturn TRUE; // return TRUE unless you set the focus to a control}void CLockDlg::OnSysCommand(UINT nID, LPARAM lParam){if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialog::OnSysCommand(nID, lParam);}}// If you add a minimize button to your dialog, you will need the code below// to draw the icon. For MFC applications using the document/view model,// this is automatically done for you by the framework.void CLockDlg::OnPaint() {if (IsIconic()){CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);// Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// Draw the icondc.DrawIcon(x, y, m_hIcon);}else{CDialog::OnPaint();}}// The system calls this to obtain the cursor to display while the user drags// the minimized window.HCURSOR CLockDlg::OnQueryDragIcon(){return (HCURSOR) m_hIcon;}void CLockDlg::OnButton1() {CString text;edit.GetWindowText(text);if(text!="sx"){AfxMessageBox("密码错误");return;}RegDeleteValue(hk,VAL_DisableTaskMgr);RegCloseKey(hk);UnhookWindowsHookEx(hook);KillTimer(1);ClipCursor(0);PostQuitMessage(0);}void CLockDlg::OnButton2() {if (RegOpenKey(HKCU, KEY_DisableTaskMgr,&hk)!=ERROR_SUCCESS)RegCreateKey(HKCU, KEY_DisableTaskMgr, &hk);DWORD val=1;RegSetValueEx(hk, VAL_DisableTaskMgr, NULL,REG_DWORD, (BYTE*)&val, sizeof(val));hook=::SetWindowsHookEx(WH_KEYBOARD_LL,key,AfxGetApp()->m_hInstance,0);SetTimer(1,100,0);}void CLockDlg::OnTimer(UINT nIDEvent) {CenterWindow();CRect r;GetWindowRect(&r);ClipCursor(&r);CDialog::OnTimer(nIDEvent);}

      程序是mfc写的，所以只把窗体的代码贴出来了。

      关于鼠标的限定很简单，但是clipcursor这个函数不能在oninitdialog里调用，因为这时窗体的加载还没有完成。还有就是关于键盘的屏蔽，我这里用了低级键盘的hook，屏蔽了常用的组合切换键，但是有一点，ctrl+alt+del键我的机子会弹出来一个“windows 安全”的窗体，这个无法屏蔽。但是我在注册表里屏蔽了任务管理器，所以这个窗体也无什么作用。

       解锁密码默认为“sx”，本文有不足之处，还望大家多多指正。