Lock keyboards keys like Ctrl , Alt, Del

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Lock keyboards keys like Ctrl , Alt, Del, using vb.net

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arroyos

Jun 15 2006, 08:37 PM

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hie,i need some help here..anyone out there,if have any knowledge or links about this, please post me the answer..thanx in advance..

i would like to know how to block user from executing task managers,means i wan to block the usage of keys like ctrl , alt and delete...as well as alt + tab and alt+f4...any idea how to block all these keyboards keys using vb.net codes????

thnx in advance

alvinz_c

Jun 15 2006, 09:38 PM

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Hi, you can try to restrict it in key press event but obviously you need more considerations. What about the users run the task manager under Start->Run with command of taskmgr?

Cheers

dopodplaya

Jun 16 2006, 08:33 AM

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QUOTE(arroyos @ Jun 15 2006, 08:37 PM)

hie,i need some help here..anyone out there,if have any knowledge or links about this, please post me the answer..thanx in advance..

i would like to know how to block user from executing task managers,means i wan to block the usage of keys like ctrl , alt and delete...as well as alt + tab and alt+f4...any idea how to block all these keyboards keys using vb.net codes????
thnx in advance

If you're thinking of restricting keystrokes in your Application Windows Forms, then you can apply the restriction on event methods. But, if you were thinking of controlling the system key input operational, then VB .NET doesn't do that by default. You may need the access that via appropriate Win32 API using DLLImport method. Since VB .NET is part of the .NET Framework, accessing priviledged Win32 API is quite a work.

arroyos

Jun 16 2006, 12:41 PM

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QUOTE(dopodplaya @ Jun 16 2006, 08:33 AM)

If you're thinking of restricting keystrokes in your Application Windows Forms, then you can apply the restriction on event methods. But, if you were thinking of controlling the system key input operational, then VB .NET doesn't do that by default. You may need the access that via appropriate Win32 API using DLLImport method. Since VB .NET is part of the .NET Framework, accessing priviledged Win32 API is quite a work.

hie..there thanx for the reply..i mean how do u restrict keys like ctrl? using what technique..if it is a key like "A" or "8"..i can restrict it using ASCII value....but how bout keys like ctrl??? i want to disable the start menu button as well..any links u all have??? example is better..thnx a lot man..

nexus-

Jun 16 2006, 09:02 PM

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You cannot intercept the Ctrl+Alt+Del key combination as Windows have exclusive control over it to allow users to verify an authentic Windows login box (e.g. on w2k machine where you need to press ctrl+alt+del before you enter your username/pass).

arroyos

Jun 16 2006, 09:56 PM

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QUOTE(nexus- @ Jun 16 2006, 09:02 PM)

You cannot intercept the Ctrl+Alt+Del key combination as Windows have exclusive control over it to allow users to verify an authentic Windows login box (e.g. on w2k machine where you need to press ctrl+alt+del before you enter your username/pass).

actually i m developing a desktop access control system...i only intercept that keys once my program starts...and further more,my system will be implemented in win xp....i wants to create a login screen for my program, which will lock the pc...and user need to login in order to use their pc..(not the window login screen here i referring to, i m doing my own login screen...

any idea???? neeed help..

KLKS

Jun 17 2006, 05:25 PM

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do ur research on system wide hooks and low level keyboard filters (system drivers)

asc2

Jun 17 2006, 05:49 PM

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you cannot control ctrl + alt + del from your application because before the message reach your application the OS already got it
you must intercept the keypress by "hooking" some function in windows, replacing the original function in windows and put your own processing there before calling the actual windows default function

SincerePrayer

Jun 17 2006, 09:17 PM

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arroyos,

Virtually we are not suppose to intercept this combination of keys. But doing that, you might create some loop hole in the windows security.

Anyway you can find some info here. One limitation, you need to convert the code to VB.NET.

Happy Coding

arroyos

Jun 18 2006, 12:05 AM

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QUOTE(SincerePrayer @ Jun 17 2006, 09:17 PM)

arroyos,
Virtually we are not suppose to intercept this combination of keys. But doing that, you might create some loop hole in the windows security.

Anyway you can find some info here. One limitation, you need to convert the code to VB.NET.
Happy Coding

thnx bro...i will work it out....thnx KLKS and asc2 also!

sincerePrayer...the code is in vb.do u think it work if i used the convertor in visual studio.net ?

This post has been edited by arroyos: Jun 18 2006, 12:30 AM

SincerePrayer

Jun 18 2006, 07:05 AM

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arroyos,

I haven't try to convert that piece of code. Since no specified code I see so far, you can give it a try. Even not 100%, you might get most of the code converted.

Happy Coding

arroyos

Jun 18 2006, 01:34 PM

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QUOTE(SincerePrayer @ Jun 18 2006, 07:05 AM)

arroyos,
I haven't try to convert that piece of code. Since no specified code I see so far, you can give it a try. Even not 100%, you might get most of the code converted.
Happy Coding

hmm.okie.i will try it out..i will tell u the result once i test it out.thnx bro!

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