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POBlocking shortcut keys using c#
 

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    <p>I am using the below code to disable the Alt+Tab, Alt+Esc, Ctrl+Esc, and Windows Key but somehow it is not working. Please help me rectify it.</p> <pre><code>namespace BlockShortcuts { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private delegate int LowLevelKeyboardProcDelegate(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam); [DllImport("user32.dll", EntryPoint = "SetWindowsHookExA", CharSet = CharSet.Ansi)] private static extern int SetWindowsHookEx( int idHook, LowLevelKeyboardProcDelegate lpfn, int hMod, int dwThreadId); [DllImport("user32.dll")] private static extern int UnhookWindowsHookEx(int hHook); [DllImport("user32.dll", EntryPoint = "CallNextHookEx", CharSet = CharSet.Ansi)] private static extern int CallNextHookEx( int hHook, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam); const int WH_KEYBOARD_LL = 13; private int intLLKey; private KBDLLHOOKSTRUCT lParam; private struct KBDLLHOOKSTRUCT { public int vkCode; int scanCode; public int flags; int time; int dwExtraInfo; } private 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 if (((lParam.vkCode == 9) &amp;&amp; (lParam.flags == 32)) || ((lParam.vkCode == 27) &amp;&amp; (lParam.flags == 32)) || ((lParam.vkCode == 27) &amp;&amp; (lParam.flags == 0)) || ((lParam.vkCode == 91) &amp;&amp; (lParam.flags == 1)) || ((lParam.vkCode == 92) &amp;&amp; (lParam.flags == 1)) || ((true) &amp;&amp; (lParam.flags == 32))) { blnEat = true; } break; } if (blnEat) return 1; else return CallNextHookEx(0, nCode, wParam, ref lParam); } private void KeyboardHook(object sender, EventArgs e) { intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL,new LowLevelKeyboardProcDelegate(LowLevelKeyboardProc), System.Runtime.InteropServices.Marshal.GetHINSTANCE( System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]).ToInt32(), 0); } private void ReleaseKeyboardHook() { intLLKey = UnhookWindowsHookEx(intLLKey); } private void checkBox1_CheckedChanged(object sender, EventArgs e) { if (checkBox1.Checked) KeyboardHook(this, e); else ReleaseKeyboardHook(); } } } </code></pre>
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    1. USSteffen Opel
    1. USAnuya
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    1. CO@Tom Ritter, what was edited in the code above. Thanks.
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    2. CO@karthik, you can find the edits at http://stackoverflow.com/revisions/1175675/list
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      1. USRobert Harvey
 

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