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Require a combination Ctrl + L to exit app

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* Require a combination Ctrl + L to exit app, while preventing any other access to the desktop
* Exits and calls Windows lock screen with Ctrl + L
* Uses low level keyboard hook to block system keys
This commit is contained in:
Andros Rosa 2017-08-16 20:48:44 -04:00 committed by Will Hilton
parent 5cc5255288
commit 52c538c37d
No known key found for this signature in database
GPG key ID: 9609B8A5928BA6B9
1 changed files with 117 additions and 37 deletions
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154
Screensaver.cs
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@ -20,6 +20,9 @@ using System.Drawing;
using System.Collections;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
using System.Diagnostics;
using System.Collections.Generic;
namespace Screensavers
{
@ -52,7 +55,7 @@ namespace Screensavers
{
}
void framerateTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
void framerateTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
achievedFramerate = updatesThisSec;
updatesThisSec = 0;
@ -76,10 +79,10 @@ namespace Screensavers
[DllImport("winmm.dll")]
static extern int timeGetTime();
[DllImport("user32.dll")]
public static extern bool LockWorkStation();
[DllImport("user32.dll")]
public static extern bool LockWorkStation();
delegate void TimeCallback(uint id, uint msg, IntPtr user, IntPtr param1, IntPtr param2);
delegate void TimeCallback(uint id, uint msg, IntPtr user, IntPtr param1, IntPtr param2);
TimeCallback timerCallback;
@ -99,7 +102,6 @@ namespace Screensavers
Application.DoEvents();
updateEvent.Reset();
}
}
void StopUpdating()
@ -520,7 +522,7 @@ namespace Screensavers
#endif
primary.FormBorderStyle = FormBorderStyle.None;
primary.Text = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
primary.Icon = InvisbleLockScreen.Properties.Resources.icon;
primary.Icon = InvisbleLockScreen.Properties.Resources.icon;
foreach (Screen screen in Screen.AllScreens)
{
@ -538,9 +540,9 @@ namespace Screensavers
form.Size = screen.Bounds.Size;
form.FormBorderStyle = FormBorderStyle.None;
form.Text = primary.Text;
form.Icon = InvisbleLockScreen.Properties.Resources.icon;
form.Icon = InvisbleLockScreen.Properties.Resources.icon;
windows.Add(new Window(this, form));
windows.Add(new Window(this, form));
}
windows.Insert(0, new Window(this, primary));
@ -574,9 +576,9 @@ namespace Screensavers
form.FormBorderStyle = FormBorderStyle.None;
form.StartPosition = FormStartPosition.Manual;
form.Text = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
form.Icon = InvisbleLockScreen.Properties.Resources.icon;
form.Icon = InvisbleLockScreen.Properties.Resources.icon;
windows = new WindowCollection(new Window[] { new Window(this, form) });
windows = new WindowCollection(new Window[] { new Window(this, form) });
form.Show();
InitializeAndStart();
@ -593,12 +595,11 @@ namespace Screensavers
private void RunWindowed()
{
Form form = new Form();
form.FormBorderStyle = FormBorderStyle.FixedSingle;
form.Text = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
form.Icon = InvisbleLockScreen.Properties.Resources.icon;
form.StartPosition = FormStartPosition.CenterScreen;
form.Icon = InvisbleLockScreen.Properties.Resources.icon;
form.StartPosition = FormStartPosition.CenterScreen;
form.BackColor = Color.Black;
#if !DEBUG
form.TopMost = true;
@ -620,18 +621,84 @@ namespace Screensavers
if (Window0 != null && Window0.Form != null)
Window0.Form.FormClosing += new FormClosingEventHandler(Form_FormClosing);
// enable keyboard hook
toggleKeyboardHook(true);
StartUpdating();
}
void Form_FormClosing(object sender, FormClosingEventArgs e)
{
StopUpdating();
LockWorkStation();
if (Exit != null)
Exit(this, new EventArgs());
e.Cancel = false;
if (!ctrlLPressed)
{
if (e.CloseReason == CloseReason.UserClosing)
e.Cancel = true;
}
else
{
StopUpdating();
LockWorkStation();
if (Exit != null)
Exit(this, new EventArgs());
e.Cancel = false;
}
}
#region Low Level Keyboard Hook
private bool ctrlLPressed;
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
private static IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
int vkCode = Marshal.ReadInt32(lParam);
List<Keys> acceptedKeys = new List<Keys> { Keys.LControlKey, Keys.RControlKey, Keys.L };
if (acceptedKeys.Contains((Keys)vkCode))
return CallNextHookEx(_hookID, nCode, wParam, lParam);
else
return (IntPtr)1;
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
public void toggleKeyboardHook(bool enable)
{
if (enable)
_hookID = SetHook(_proc);
else
UnhookWindowsHookEx(_hookID);
}
#endregion
#region IDisposable Members
bool isEnded = false;
@ -651,26 +718,28 @@ namespace Screensavers
void OnKeyboardInput()
{
// disable keyboard hook
toggleKeyboardHook(false);
if (Window0.Form != null)
Window0.Form.Close();
else
Application.Exit();
}
void OnMouseClick()
{
/*
if (closeOnMouseMove)
{
if (Window0.Form != null)
Window0.Form.Close();
else
{
Application.Exit();
}
}
}
void OnMouseClick()
{
if (closeOnMouseMove)
{
if (Window0.Form != null)
Window0.Form.Close();
else
{
Application.Exit();
}
}
*/
}
/// <summary>
@ -697,9 +766,9 @@ namespace Screensavers
form.KeyUp += new KeyEventHandler(form_KeyUp);
form.KeyPress += new KeyPressEventHandler(form_KeyPress);
//form.BackColor = Color.Lime;
//form.TransparencyKey = Color.Lime;
form.Opacity = 0.01;
//form.BackColor = Color.Lime;
//form.TransparencyKey = Color.Lime;
form.Opacity = 0.01;
this.screensaver.PreUpdate += new EventHandler(screensaver_PreUpdate);
this.screensaver.PostUpdate += new EventHandler(screensaver_PostUpdate);
@ -784,21 +853,32 @@ namespace Screensavers
{
if (KeyPress != null)
KeyPress(this, e);
screensaver.OnKeyboardInput();
//screensaver.OnKeyboardInput();
}
void form_KeyUp(object sender, KeyEventArgs e)
{
if (KeyUp != null)
KeyUp(this, e);
screensaver.OnKeyboardInput();
if (e.Control && e.KeyCode == Keys.L)
{
screensaver.ctrlLPressed = true;
screensaver.OnKeyboardInput();
}
}
void form_KeyDown(object sender, KeyEventArgs e)
{
if (KeyDown != null)
KeyDown(this, e);
screensaver.OnKeyboardInput();
if (e.Control && e.KeyCode == Keys.L)
{
screensaver.ctrlLPressed = true;
screensaver.OnKeyboardInput();
}
}
void form_MouseWheel(object sender, MouseEventArgs e)