![]() Public int LowLevelKeyboardProc ( int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam ) Private static extern int ShowWindow ( int hwnd, int command ) Private static extern int FindWindow ( string className, string windowText ) Public static extern int CallNextHookEx ( int hHook, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam ) Public delegate int LowLevelKeyboardProcDelegate ( int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam ) Public static extern int UnhookWindowsHookEx ( int hHook ) Public static extern int SetWindowsHookEx ( int idHook, LowLevelKeyboardProcDelegate lpfn, int hMod, int dwThreadId ) Then the context switches back to the application that generated the event.Īgain, dont forget: using System. Instead, the context switches back to the process that installed the hook and it is called in its original context. However, the WH_KEYBOARD_LL hook is not injected into another process. If the input comes from a call to keybd_event, the input was “injected”. The keyboard input can come from the local keyboard driver or from calls to the keybd_event function. The system calls this function every time a new keyboard input event is about to be posted into a thread input queue. The LowLevelKeyboardProc hook procedure is an application-defined or library-defined callback function used with the SetWindowsHookEx function. The code snippet uses the LowLevelKeyboardProc which is: I will give you the the source of the method called hooks. I can’t name one, as I was looking into at least 15 which all held some useful peace of information. As for the rest I was reading many many articles, and they gave a lot of help. 5 lines of code alltogether: private void Form1_FormClosing ( object sender, FormClosingEventArgs e ) You might have found this a bit difficult, so here’s an easy one. So the CTRL-ALT-DEL combo has been taken care of, let’s see the rest. SetValue ( "DisableTaskMgr", keyValueInt ) String subKey = "Software\Microsoft\Windows\CurrentVersion\Policies\System" Win32 Īnd now the method I have created looks like this: public void KillCtrlAltDelete ( ) Important thing, don’t miss out this line: using Microsoft. Let’s get down to business and start coding: If you change it’s value, the following registry entry gets created/modified: Software\Microsoft\Windows\CurrentVersion\Policies\System and the value of DisableTaskMgr gets set to 1. Select Remove Task Manager > Double-click the Remove Task Manager option. Navigate to: User Configuration > Administrative Templates > System > CTRL ALT DELETE Options.This is the place where you normally set the behaviour of the key combo. Open Start Menu > Run and enter gpedig.msc. Let’s see what we are about to do without programming anything. We will use C#’s Registry editing possibilities to set/change the group policy for the CTRL-ALT-DEL key sequence. CTRL-ALT-DEL combo is part of the SAS ( Attention Sequence) thus the solution to disable this is to write your own gina.dll ( Graphical Identification and Authentication).ĭon’t worry, I’m not looking into that as for now, I’m going to show you the work around. ![]() If you use this code it should be for your own fun or for learning purposes.Īfter doing some research on disabling keys or key combinations I found out that there are several ways of achieving the before mentioned key combos. This article was relevant back then - and it wasn't tested on a Windows 7 environment purely due to the fact that it did not exist and please also note that comments are disabled for this post.īefore continue reading please note that this article doesn’t intend to call upon you to create nasty applications. I wrote an article back in 2007 that is still around the web, in various discussions including StackOverflow and DotNetSpider, so I have decided to re-publish the article. Of the content may be relevant please take it with a pinch of salt. Screenshots may be missing and links could be broken.
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