基于C#实现电脑系统挂机锁
作者：芝麻粒儿
这篇文章主要为大家详细介绍了如何利用C#实现电脑系统挂机锁，文中的示例代码讲解详细，对我们学习C#有一定的帮助，感兴趣的小伙伴可以跟随小编一起了解一下
实践过程
效果
代码
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private Point mouseOffset;//鼠标位置
private bool isMouseDown = false;//表示鼠标是否按下
private void pictureBox2_Click(object sender, EventArgs e)
{
Application.Exit();//窗体的关闭按钮
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
int xOffset;
int yOffset;
if (e.Button == MouseButtons.Left)
{
xOffset = -e.X;
yOffset = -e.Y;
mouseOffset = new Point(xOffset, yOffset);
isMouseDown = true;
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (isMouseDown)
{
Point mousePos = Control.MousePosition;
mousePos.Offset(mouseOffset.X, mouseOffset.Y);
Location = mousePos;
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
isMouseDown = false;
}
}
private void button2_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void button1_Click(object sender, EventArgs e)
{
if (txtPwd.Text.Trim() == "" || txtPwd2.Text.Trim() == "")//判断是否输入密码
{
MessageBox.Show("请输入密码！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
if (txtPwd2.Text.Trim() == txtPwd.Text.Trim())//如果两次密码输入一致
{
Form2 frm2 = new Form2();//实例化Form2窗体
frm2.s = this.Size;//传递窗体大小
frm2.x = this.Location.X;//传递窗体的X坐标
frm2.y = this.Location.Y;//传递窗体的Y坐标
frm2.infos = txtInfo.Text.Trim();//传递挂机信息
frm2.pwd = txtPwd2.Text.Trim();//传递解锁密码
this.Hide();//隐藏当前窗体
frm2.ShowDialog();//打开Form2窗体
}
else
{
MessageBox.Show("两次密码不一致！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
public Size s;//获取鼠标活动的区域
public int x;//获取鼠标活动区域的X坐标
public int y;//获取鼠标活动区域的Y坐标
public string infos;//获取挂机信息
public string pwd;//获取解锁密码
myHook h = new myHook();//实例化公共类
private void Form2_Load(object sender, EventArgs e)
{
label1.Location = new Point(x,y-50);//设置显示挂机信息的位置
label1.Text = infos;//显示挂机信息
base.Opacity = 0.5;//设置挂机界面透明度
h.InsertHook();//安装钩子
}
private void Form2_MouseMove(object sender, MouseEventArgs e)
{
Cursor.Clip = new Rectangle(x, y, s.Width, s.Height);//设置鼠标活动的区域
}
private void Form2_MouseClick(object sender, MouseEventArgs e)
{
Form3 frm3 = new Form3();//实例化Form3窗体
frm3.x = x;//传递X坐标
frm3.y = y;//传递Y坐标
frm3.infos = infos;//传递挂机信息
frm3.pwd = pwd;//传递解锁密码
frm3.ShowDialog();//打开解锁界面
}
private void timer1_Tick(object sender, EventArgs e)
{
Process[] p = Process.GetProcesses();//获取所有系统运行的进程
foreach (Process p1 in p)//遍历进程
{
try
{
//如果进程中存在名为“taskmgr”，则说明任务管理器已经打开
if (p1.ProcessName.ToLower().Trim() == "taskmgr")
{
p1.Kill();//关掉任务管理器的进程
Cursor.Clip = new Rectangle(x, y, s.Width, s.Height);//重新设置鼠标活动的区域
return;
}
}
catch
{
return;
}
}
}
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
h.UnInsertHook();//卸载钩子
timer1.Stop();//停止计时器
}
}
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
public int x;//鼠标活动区域的X坐标
public int y;//鼠标活动区域的Y坐标
public string infos;//挂机界面显示的信息
public string pwd;//解锁密码
private void Form3_Load(object sender, EventArgs e)
{
this.TopMost = true;//设置停靠在最前端
this.Location = new Point(x, y);//设置窗体位置
lblinfo.Text = infos;//显示挂机信息
}
private void button1_Click(object sender, EventArgs e)
{
if (txtPwd.Text.Trim() == pwd)//判断输入的密码是否正确
{
Application.Exit();//如果正确则退出挂机界面
}
else//否则
{
lblinfo.Text = "输入解锁密码错误，请重新输入！";//提示错误信息
}
}
private void button2_Click(object sender, EventArgs e)
{
this.TopMost = false;//取消停靠最前的设置
this.Close();//关闭窗体
}
}
public class myHook
{
private IntPtr pKeyboardHook = IntPtr.Zero;//键盘钩子句柄
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);// 钩子委托声明
//键盘钩子委托实例不能省略变量
private HookProc KeyboardHookProcedure;
//底层键盘钩子
public const int idHook = 13;
//安装钩子
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn,
IntPtr pInstance, int threadId);
//卸载钩子
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(IntPtr pHookHandle);
//键盘钩子处理函数
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
KeyMSG m = (KeyMSG)Marshal.PtrToStructure(lParam, typeof(KeyMSG));
if (pKeyboardHook != IntPtr.Zero)
{
switch (((Keys)m.vkCode))
{
case Keys.LWin:
case Keys.RWin:
case Keys.Delete:
case Keys.Alt:
case Keys.Escape:
case Keys.F4:
case Keys.Control:
case Keys.Tab:
return 1;
}
}
return 0;
}
//安装钩子
public bool InsertHook()
{
IntPtr pIn = (IntPtr)4194304;
if (this.pKeyboardHook == IntPtr.Zero)
{
this.KeyboardHookProcedure = new HookProc(KeyboardHookProc);
this.pKeyboardHook = SetWindowsHookEx(idHook, KeyboardHookProcedure, pIn, 0);
if (this.pKeyboardHook == IntPtr.Zero)
{
this.UnInsertHook();
return false;
}
}
return true;
}
//卸载钩子
public bool UnInsertHook()
{
bool result = true;
if (this.pKeyboardHook != IntPtr.Zero)
{
result = (UnhookWindowsHookEx(this.pKeyboardHook) && result);
this.pKeyboardHook = IntPtr.Zero;
}
return result;
}
[StructLayout(LayoutKind.Sequential)]
public struct KeyMSG
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
}
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