C#屏幕锁的实现
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using Microsoft.Win32;
using System.IO;
namespace Wymangr
{
public partial class lockscreen : Form
{
//委托
public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
static int hHook = 0;
public const int WH_KEYBOARD_LL = 13;
// private int count = 0;
//LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。
HookProc KeyBoardHookProcedure;
private FileStream MyFs;
private int time = 1;
//键盘Hook结构函数
[StructLayout(LayoutKind.Sequential)]
public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
#region DllImport
//设置钩子
[DllImport("user32.dll")]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
//抽掉钩子
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll")]
//调用下一个钩子
public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
[DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name);
public void Hook_Start()
{
// 安装键盘钩子
if (hHook == 0)
{
KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
//hHook = SetWindowsHookEx(2,
// KeyBoardHookProcedure,
// GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());
hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
KeyBoardHookProcedure,
GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
//如果设置钩子失败.
if (hHook == 0)
{
Hook_Clear();
//throw new Exception("设置Hook失败!");
}
}
MyFs = new FileStream(Environment.ExpandEnvironmentVariables("%windir%//system32//taskmgr.exe"),
FileMode.Open);
// byte[] MyByte = new byte[(int)MyFs.Length];
// MyFs.Write(MyByte, 0, (int)MyFs.Length);
}
//取消钩子事件
public void Hook_Clear()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
//如果去掉钩子失败.
if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");
}
//这里可以添加自己想要的信息处理
public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{
KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
if (kbh.vkCode == 91) // 截获左win(开始菜单键)
{
return 1;
}
if (kbh.vkCode == 92)// 截获右win
{
return 1;
}
if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control) //截获Ctrl+Esc
{
return 1;
}
if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+f4
{
return 1;
}
if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab
{
return 1;
}
if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift+Esc
{
return 1;
}
if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+空格
{
return 1;
}
if (kbh.vkCode == 241) //截获F1
{
return 1;
} if (kbh.vkCode == (int)Keys.Control && kbh.vkCode == (int)Keys.Alt && kbh.vkCode == (int)Keys.Delete)
{
return 1;
}
if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete) //截获Ctrl+Alt+Delete
{
return 1;
}
if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift
{
return 1;
}
//if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt) //截获Ctrl+Alt+空格
//{
// return 1;
//}
}
return CallNextHookEx(hHook, nCode, wParam, lParam);
}
#endregion
public lockscreen()
{
InitializeComponent();
}
//窗体加载事件
private void Form2_Load(object sender, EventArgs e)
{
this.FormBorderStyle = FormBorderStyle.None;
this.WindowState = FormWindowState.Maximized;
txtPassword.Focus();
Hook_Start();
}
//关闭事件
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
Hook_Clear();
timer2.Stop();
}
//点击解锁按钮
private void button1_Click(object sender, EventArgs e)
{
if (txtPassword.Text == "123123")//自己留的后门
{
DialogResult result = MessageBox.Show("您确定要解锁吗？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
if (result == DialogResult.OK)
{
Application.Exit();
}
else
{
txtPassword.Text = "";
}
}
else
{
//密码错误3次 按钮禁用等三分钟
if (time < 3)
{
string info = "密码错误，请重新输入！您还有" + (3 - time) + "次机会";
MessageBox.Show(info);
time++;
}
else
{
button1.Enabled = false;
//lble.Visible = true;
timer1.Start();
}
}
}
private int a = 0;
///
///三分钟后 按钮可以使用
///
///
///
private void timer1_Tick(object sender, EventArgs e)
{
a++;
if (a == 180)
{
button1.Enabled = true;
time = 1;
// lble.Visible = false;
timer1.Stop();
}
}
///
/// 计时器判断系统是否存在任务管理器 若存在结束它 ！ 注意存在BUG具体是什么自己用就知道了！
///
///
///
private void ti_Tick(object sender, EventArgs e)
{
Process[] p = Process.GetProcesses();
foreach (Process p1 in p)
{
try
{
if (p1.ProcessName.ToLower().Trim() == "taskmgr")//这里判断是任务管理器
{
p1.Kill();
return;
}
}
catch
{
return;
}
}
}
}
}