disable the CTRL ALT DELETE key in visual basic.net

[quietfulness]

Good day.

I'm creating a simple form that could capture keystrokes. How can i capture CTRL-ALT-DELETE key when pressed together so as not to go to the task manager, in short I want to disable any function when the three keys is pressed. I tried to use the keydown event , detecting the three keys when pressed then set e.handled = true, but still it wont work

How could i do it in VB.NET, any help would be greatly appreciated. please....

THank you very much.

[<ABX]

Not possible in win 2k/xp....

[Andy]

can he not capture the ascii character of one or all three concatenated and escape the event sequence? I did that with a custom control that accepts only numbers and nothing else.

[nemaroller]

No, the event never gets passed to the app from the OS, acting as if no key was ever pressed.

[techgnome]

Originally posted by Andy
can he not capture the ascii character of one or all three concatenated and escape the event sequence? I did that with a custom control that accepts only numbers and nothing else.

No, because two out of the three keys (Ctrl & Alt) have no ASCII.... they are not characters, they are keyes.

Originally posted by nemaroller
No, the event never gets passed to the app from the OS, acting as if no key was ever pressed.

Right, makes sense to me. As the keys are sent through the keyboard IRQ, the OS picks up that the Ctrl-Alt-Del keys were hit, and goes into the Task Manager mode. The key strokes never make it to the app.

The only way this is going to work is if the OS didn't intercept the keystrokes and always sent everything. Which used to be possible (pre Win2k). I don't know if it istill is or not. It could a couple of APIs to get it done (and no, I don't know what they are either.)

There is a danger of diabling the C-A-D keystrokes though. God forbid that something goes horribly wrong and they need to three-finger salute to get out of an app. Suddenly, it doesn't work! So, use it wisely.

TG

[thurst0n]

I"m confused why you want to use those keys anyway...why don't you just use some other keys to take a screenshot?

[thurst0n]

haha whoops...keystrokes w00t w00t, lol i'm dumb sorry i'll shut up...are you making a key-logger?

I bet there is a way to make your program know that Windows did it's thing when the keys were pressed, so...

If windowsdoesit'sthing = true Then
Control+Alt+Delete were pressed
End If

maybe...maybe not

[nemaroller]

Besides which, any windows application made in the Philipines since the 'I love U' virus, automatically does not work in the West.

[quietfulness]

thnx for ur replies. Im a newbie programmer in vb.net, can anyone provide me a code that disables keypress ( ctrl-ESC, ALT-ESC, windows keys, ALT-TAB, CTRL-ALT-DEL), or links of tutorials on how to hook this keys.

thank you very much

[nemaroller]

You need to use Win32 API's for this. I think someone mentioned that.

Just be warned, you better be careful, because messing with hooks will screw your system faster than a 1800xp Athlon without its heatsink.

[quietfulness]

ok. I only need tutorials and code snippets so that I can get a fresh start.

TNX.

[nemaroller]

Good overview
http://www.codeproject.com/system/hooksys.asp

Doing that in .Net
http://msdn.microsoft.com/msdnmag/is...0/CuttingEdge/