I am using the below code to disable the hotkeys like Alt + f4, ctrl + c which are working perfectly. But I could not register win + L using the below code.
namespace KioskMode
{
public partial class Test : Form
{
#region Dynamic Link Library Imports
[DllImport("user32.dll")]
private static extern int FindWindow(string cls, string wndwText);
[DllImport("user32.dll")]
private static extern int ShowWindow(int hwnd, int cmd);
[DllImport("user32.dll")]
private static extern long SHAppBarMessage(long dword, int cmd);
[DllImport("user32.dll")]
private static extern int RegisterHotKey(IntPtr hwnd, int id, int fsModifiers, int vk);
[DllImport("user32.dll")]
private static extern int UnregisterHotKey(IntPtr hwnd, int id);
#endregion
#region Modifier Constants and Variables
// Constants for modifier keys
private const int USE_ALT = 1;
private const int USE_CTRL = 2;
private const int USE_SHIFT = 4;
private const int USE_WIN = 8;
// Hot key ID tracker
short mHotKeyId = 0;
#endregion
public Test()
{
InitializeComponent();
RegisterGlobalHotKey(Keys.F4, USE_ALT);
RegisterGlobalHotKey(Keys.L, USE_WIN);
}
private void RegisterGlobalHotKey(Keys hotkey, int modifiers)
{
try
{
mHotKeyId++;
if (mHotKeyId > 0)
{
// register the hot key combination
if (RegisterHotKey(this.Handle, mHotKeyId, modifiers, Convert.ToInt16(hotkey)) == 0)
{
MessageBox.Show("Error: " + mHotKeyId.ToString() + " - " +
Marshal.GetLastWin32Error().ToString(),
"Hot Key Registration");
}
}
}
catch
{
UnregisterGlobalHotKey();
}
}
private void UnregisterGlobalHotKey()
{
for (int i = 0; i < mHotKeyId; i++)
{
UnregisterHotKey(this.Handle, i);
}
}
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
const int WM_HOTKEY = 0x312;
if (m.Msg == WM_HOTKEY)
{
// Ignore the request or each
// disabled hotkey combination
}
}
}
}