C# 收到错误后,对Form1+;类型的垃圾回收委托进行了回调;LowLevelKeyboardProcDelegate::调用';
//方法调用锁键C# 收到错误后,对Form1+;类型的垃圾回收委托进行了回调;LowLevelKeyboardProcDelegate::调用';,c#,keyboard,hook,C#,Keyboard,Hook,//方法调用锁键 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Diagnostics;
// The application can disable windows key task manager and ctrl esc etc
namespace TrialLocks
{
public partial class Form1 : Form
{
[DllImport("user32", EntryPoint = "SetWindowsHookExA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
public static extern int SetWindowsHookEx(int idHook, LowLevelKeyboardProcDelegate lpfn, int hMod, int dwThreadId);
[DllImport("user32", EntryPoint = "UnhookWindowsHookEx", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
public static extern int UnhookWindowsHookEx(int hHook);
public delegate int LowLevelKeyboardProcDelegate(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);
[DllImport("user32", EntryPoint = "CallNextHookEx", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
public static extern int CallNextHookEx(int hHook, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);
public const int WH_KEYBOARD_LL = 13;
/*code needed to disable start menu*/
[DllImport("user32.dll")]
private static extern int FindWindow(string className, string windowText);
[DllImport("user32.dll")]
private static extern int ShowWindow(int hwnd, int command);
private const int SW_HIDE = 0;
private const int SW_SHOW = 1;
public struct KBDLLHOOKSTRUCT
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
public static int intLLKey;
// Initialize
public Form1()
{
InitializeComponent();
}
//关闭“开始”菜单或windows键
public int LowLevelKeyboardProc(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam)
{
bool blnEat = false;
switch (wParam)
{
case 256:
case 257:
case 260:
case 261:
//Alt+Tab, Alt+Esc, Ctrl+Esc, Windows Key,
blnEat = ((lParam.vkCode == 9) && (lParam.flags == 32)) | ((lParam.vkCode == 27) && (lParam.flags == 32)) | ((lParam.vkCode == 27) && (lParam.flags == 0)) | ((lParam.vkCode == 91) && (lParam.flags == 1)) | ((lParam.vkCode == 92) && (lParam.flags == 1)) | ((lParam.vkCode == 73) && (lParam.flags == 0));
break;
}
if (blnEat == true)
{
return 1;
}
else
{
return CallNextHookEx(0, nCode, wParam, ref lParam);
}
}
我正在开发一个不能被用户交互关闭的应用程序
我正在尝试禁用windows键、任务管理器等应用程序工作正常,但当我单击ctrl-alt-del并将焦点从锁屏返回到form1时,它崩溃,出现以下错误,对类型为“TrialLocks”的垃圾回收委托进行了回调!TrialLocks.Form1+LowLevel键盘ProcDelegate::Invoke'
仅当我尝试关闭任务管理器时,应用程序才会抛出错误。我想这就是问题与其他问题不同的地方
任何指导的帮助都会很好。为LowLevelKeyboardProc创建变量,否则它将被处理
public void KillStartMenu()
{
int hwnd = FindWindow("Shell_TrayWnd", "");
ShowWindow(hwnd, SW_HIDE);
}
// call the form load event and start key board hook
private void Form1_Load(object sender, EventArgs e)
{
intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, System.Runtime.InteropServices.Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]).ToInt32(), 0);
}
// closing the main form
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
UnhookWindowsHookEx(intLLKey);
}
private void timer1_Tick(object sender, EventArgs e)
{
foreach (Process selProcess in Process.GetProcesses())
{
if (selProcess.ProcessName == "taskmgr")
{
selProcess.Kill();
}
}
}
// Timer getting started
private void Form1_Activated(object sender, EventArgs e)
{
timer1.Start();
}
// Timer getting stopped
private void Form1_Deactivate(object sender, EventArgs e)
{
timer1.Stop();
}
}
}
只有在调用Timer1事件时才会崩溃,如果删除了计时器代码,应用程序的其余部分工作正常,我想知道为什么应用程序会因为这些原因崩溃?为什么不使用Windows kiosk模式?我不能使用它,因为用户可以在特定时间调用它,同时他可能正在运行其他应用程序。我只想在我的应用程序运行时冻结输入,如果用户按ctrl-alt-del并选择task manager,则不允许这样做。我不想通过编辑注册表来禁用任务管理器,而是要终止任务管理器进程。伙计,忘了这种方法,使用动态锁定会话之类的方法,我一直在这里,我可以告诉你,用应用程序有效阻止输入是不可能的,用户总会找到一种方法,通过控制台、执行脚本、批处理文件、交换会话或任何其他方法的程序,杀死你的应用程序并执行应用程序想要的任何东西。@ChikkuJacob听起来是一个非常糟糕的设计。保证让你的用户恼火这很完美,而且速度也很快。非常感谢Pablo,你是摇滚明星的朋友。。。干杯
public partial class Form1 : Form
{
LowLevelKeyboardProcDelegate del;
...
private void Form1_Load(object sender, EventArgs e)
{
del = new LowLevelKeyboardProcDelegate(LowLevelKeyboardProc);
intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL, del, System.Runtime.InteropServices.Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]).ToInt32(), 0);
}
...
}